Mostrando ítems 9-28 de 88

Behaviour of the contact trace in a cam-follower system when the displacement law has been designed using bézier curves

Acevedo Peñaloza, Carlos Humberto; Henao Leon, Diego; Rojas Suárez, Jhan Piero (Contemporary Engineering SciencesBulgaria, 2018-11-06)

The study shows the distribution of the contact trace in a cam - follower mechanism in which the Bézier curves of degrees 5, 7 and 9 have been used for the design of displacement of the follower. The equations that ...
A bibliometric analysis environmental impact assessment literature: An expanding and shifting focus

Coba Salcedo, Milton Fabian; Valencia Ochoa, Guillermo; Acevedo Peñaloza, Carlos Humberto (Chemical Engineering TransactionsItalia, 2018-09)

A bibliometric analysis of the literature on the subject of Environmental Impact Assessment for a period from 2007 to 2015 was carried out under an expanding and shifting focus. For this purpose, the metadata used ...
Bibliometric analysis of the thermal storage systems research in the last ten years

Peralta-Ruiz, Yeimmy; Acevedo Peñaloza, Carlos Humberto; Valencia Ochoa, Guillermo (International Journal of ChemTech ResearchIndia, 2018)

In this research we analyze the state of the art of the technological developments that are being presented by the scientific community to mitigate the strong environmental changes with renewable energies. The results ...
Bibliometric science indicators applied to environmental impacts research

Peralta-Ruiz, Yeimmy; Acevedo Peñaloza, Carlos Humberto; Valencia Ochoa, Guillermo (Contemporary Engineering SciencesBulgaria, 2018-08-01)

The growth and development of research on environmental impacts in terms of publications such as the Web of Science sample are analyzed during the period 2007-2018 using HistCite to learn about a global ranking, citations, ...
Bibliometric study of state observer research applied to internal combustion engine

VALENCIA OCHOA, GUILLERMO ELIECER; Acevedo Peñaloza, Carlos Humberto; CARDENAS ESCORCIA, YULINETH DEL CARMEN (Journal of Physics: Conference SeriesEstados Unidos, 2018-12-07)

The present study was conducted to evaluate the worldwide scientific production related to observers applied to internal combustion engines by taking information from the Web of Science (WoS) database and taking the papers ...
Brake discs: A technological review from its analysis and assessment

García León, Ricardo Andres; Florez, Eder; Suárez Quiñones, Alvaro Enrique (Informador TécnicoColombia, 2019-10-31)

Braking systems are undoubtedly the most important component for road safety, since it determines the total or partial stop of a vehicle and, therefore, guarantees the physical integrity of passengers. Normally, the front ...
Caracterización de la tasa de liberación de calor en los cilindros de un motor de generación a gas natural de 2 MW

Valencia-Ochoa, Guillermo; Duarte Forero, Jorge; Acevedo Peñaloza, Carlos Humberto (AiBi Revista de Investigación, Administración e IngenieríaColombia, 2020-01-01)

Desarrollar modelos matemáticos para los motores de generación de energía más confiables que permitan proponer un uso eficiente de los combustibles y aumentar la eficiencia de conversión energética, ...
Caracterización Térmica de mezclas de arcillas utilizadas en la fabricación de productos de mampostería para la contrucción

García León, Ricardo Andrés; Flórez Solano, Eder; Acevedo Peñaloza, Carlos (Revista Colombiana De Tecnologías De Avanzada ISSNColombia, 2018)

Actualmente en Norte de Santander existe gran variedad de yacimientos naturales que se pueden utilizar para fabricar productos de mampostería para la construcción como lo son bloques, tejas, ladrillos, baldosas, entre ...
Caracterización térmica de mezclas de arcillas utilizadas en la fabricación de productos de mampostería para la construcción

García León, Ricardo Andres; Flórez Solano, Eder; Acevedo Peñaloza, Carlos Humberto (Revista Colombiana de Tecnologías de AvanzadaColombia, 2018)

Actualmente en Norte de Santander existe gran variedad de yacimientos naturales que se pueden utilizar para fabricar productos de mampostería para la construcción como lo son bloques, ...
CFD performance analysis for Darrieus Hydrokinetic Turbine

Rolong Ortiz, Humberto; Acevedo Peñaloza, Carlos Humberto; Valencia, Guillermo (Journal of Engineering Science and Technology ReviewGrecia, 2019-04-10)

This work proposes the analysis of the behavior of a Darrieus type hydrokinetic turbine, starting from the mathematical model that allows to delimit the operation system, linking all the variables present in the phenomenon, ...
CFD simulation of HPAM EOR solutions mechanical degradation by restrictions in turbulent flow

Herrera Quintero, Julia Jineth ; Prada, Luis; Maya, Gustavo; VERGEL, JOSE; Castro Garcia, Ruben Hernan; QUINTERO, HENDERSON; Jiménez, Robinson; Pérez, Eduar (CT&F - Ciencia, Tecnología y FuturoColombia, 2020-12-17)

Polymer flooding is a widely used enhanced oil recovery (EOR) technology. The purpose of the polymer is to increase water viscosity to improve reservoir sweep efficiency. However, mechanical elements of the polymer injection ...
Clay surface characteristics using atomic force microscopy

Acevedo Peñaloza, Carlos Humberto; Florez, Eder; García León, Ricardo Andres (Revista Facultad de Ingeniería Universidad de AntioquiaColombia, 2018-06-07)

The first component for the manufacture of masonry products used in construction is clay, which provides the plasticity that facilitates the molding and handling of the product. The second component is the feldspar in form ...
Combustion and performance study of low-displacement compression ignition engines operating with Diesel–Biodiesel blends

Valencia, Guillermo; Acevedo Peñaloza, Carlos Humberto; Duarte Forero, Jorge (Applied SciencesSuiza, 2020-01-30)

This study investigated the influence of different biodiesel blends produced from residual sunflower oil and palm oil from agroindustry liquid waste on the characteristics of the combustion process, performance, and emissions ...
A comparative study of the cutting parameter in milling process under different material

Acevedo Peñaloza, Carlos Humberto; Valencia, Guillermo; Coba Salcedo, Milton Fabian (Contemporary Engineering SciencesBulgaria, 2018-06-18)

In the present study, the incidence of the variation in feed rate per tooth and depth of cut for SAE 4340 alloy steel and SAE J431 steel castings was analysed and in which material this variation is most noticeable. For ...
Comparison of the Concentration Factor of Stresses on Flat Sheets with Two Holes with Low and High Speed Voltage Test

Acevedo Peñaloza, Carlos Humberto; Ramón Ramón, Sergio Andrés; Prada Botia, Gaudy Carolina (Contemporary Engineering SciencesBulgaria, 2018-07-31)

The research seeks to determine whether the stress concentration factor for flat plates with two stressed holes varies according to the application speed of the load. The research was developed using the experimental ...
Comparison of the radius of curvature in the cams which used in the displacement law beziér curves and cyclic and harmonic curves

Acevedo Peñaloza, Carlos Humberto; Daza Buitrago, Miguel; Prada Botia, Gaudy Carolina (Contemporary Engineering SciencesBulgaria, 2018-11-07)

The work shows the radius of curvature for different variations of the angle of rotation β and of the ratio of Ro/L, the study is shown for the case in which the laws of displacement of the cams have been designed by ...
Computational fluid dynamics analysis of combined cycle power plant heat exchanger with OpenFOAM® software

Cárdenas-Gutiérrez, Javier Alfonso; Acevedo Peñaloza, Carlos Humberto; Orjuela Abril, Martha Sofia (International Review on Modelling and SimulationsItalia, 2020-10)

The heat exchangers application in combined cycle power plants is a key aspect in the thermal and fluid mechanics sciences due to their elevated functionality in industrial processes related to the quality and the efficiency ...
Desarrollo de una metodología para la predicción de curvas características en bombas periféricas

Valencia-Ochoa, Guillermo; Acevedo Peñaloza, Carlos Humberto; Duarte Forero, Jorge (AiBi Revista de Investigación, Administración e IngenieríaColombia, 2020-05-01)

Las bombas rotodinámicas han presentado un desarrollo muy notable en los últimos años; debido a esto, su implementación se ha diversificado ampliamente en aplicaciones industriales y domiciliarias. La modificación de los ...
Design of a ball burnishing tool with interchangeable tip

Coba Salcedo, Milton Fabian; Acevedo Peñaloza, Carlos Humberto; Guerrero Gomez, Gustavo (Contemporary Engineering SciencesBulgaria, 2018-09-18)

The following work was carried out with the goal of studying the functionality of a previously realized design of an interchangeable indenter tool for the ball burnishing process in a numerical control milling machine ...
Design of a mechanical seeder

Ospina-Bayona, H E; Sánchez-Torres, C C; García-León, R A; Ballesteros-Ruiz, H A; Pérez-Lozano, B C (Journal of Physics: Conference SeriesReino Unido, 2019-11-19)

In the agricultural production processes that are carried out in most of the Colombian regions, some deficiencies can be observed in the way in which the seeds are sown. This is a task that is carried out manually, generating ...

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Behaviour of the contact trace in a cam-follower system when the displacement law has been designed using bézier curves
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Acevedo Peñaloza, Carlos Humberto | 2018-11-06

The study shows the distribution of the contact trace in a cam - follower mechanism in which the Bézier curves of degrees 5, 7 and 9 have been used for the design of displacement of the follower. The equations that describe the movement of the follower and its derivatives are presented, the expressions are formulated for the contact trace, the force exerted on the mechanical assembly are formulated and the results obtained are presented in a model mechanism.

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A bibliometric analysis environmental impact assessment literature: An expanding and shifting focus
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Coba Salcedo, Milton Fabian | 2018-09

A bibliometric analysis of the literature on the subject of Environmental Impact Assessment for a period from 2007 to 2015 was carried out under an expanding and shifting focus. For this purpose, the metadata used was obtained through web of science and analyzed with the Histcite software. The search identified a total of 683 publications related to Environmental Impact Assessment in the period studied, allowing to study the main journals involved in this topic. The country with the highest number of publications was the United States with 88 papers on the subject. On the other hand, the journal with the greatest influence on the subject was Environmental Impact Assessment Review, with 1090 citations, representing the 8.7% of the total citations between 2007 and 2015. Analyzing the evolution of publications per year, there was an increase in research activity on the subject between 2012 and 2014, amounting to 45.6% in those years. According to the type of document from the 683 publications, the 84.6% (578) were articles and 4.4% reviews. These results obtained show an increase in the interest of researchers in the environmental impact assessment topic, which is in line with the climate changes presented on the planet and the global concern to reduce the effects of greenhouse gas, and the better use of natural resources.

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Bibliometric analysis of the thermal storage systems research in the last ten years
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Peralta-Ruiz, Yeimmy | 2018

In this research we analyze the state of the art of the technological developments that are being presented by the scientific community to mitigate the strong environmental changes with renewable energies. The results obtained by the bibliometric techniques in the period 2007-2018 show that in the 1900 published articles the People's Republic of China presents the highest volume of 32.3% of the total publications, showing a strong influence on the development of energy storage technologies and the availability of materials. The results presented in this article allow us to evaluate the development of researchers in this alternative of energy storage as a replacement to the distribution that is done with traditional methods.

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Bibliometric science indicators applied to environmental impacts research
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Peralta-Ruiz, Yeimmy | 2018-08-01

The growth and development of research on environmental impacts in terms of publications such as the Web of Science sample are analyzed during the period 2007-2018 using HistCite to learn about a global ranking, citations, article impact, keywords and research trends in this area. The research trend increased during the years 2014 and 2017. The United States is the country with the highest number of publications. The Journal of Cleaner Production is the journal with the highest number of publications, along with Science of Total Environment and the Environmental impact assemble review.

LEER
Bibliometric study of state observer research applied to internal combustion engine
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VALENCIA OCHOA, GUILLERMO ELIECER | 2018-12-07

The present study was conducted to evaluate the worldwide scientific production related to observers applied to internal combustion engines by taking information from the Web of Science (WoS) database and taking the papers published between 2001 − 2017. The works found are mostly research articles with a total of 130 articles equivalent to 97.01%, of the 134 articles studied, and it was also noted that the production of this type of work increased in the last 3 years, with the maximum value in 2015 being 22 articles, even in those 3 years, the greatest number of references were also found. The United States is the country with the highest number of publications with 42 followed by People´s Republic of China, France and UK with 41, 11 and 11 respectively. Although the USA is the country with the highest number of publications, China has consolidated its position as the country with the highest number of publications and citations in the last 3 years. However, within the top 10 institutes with the highest number of publications, 4 of them are from the United States, among which Ohio State University stands out as the institute with the highest number of publications with 16 (11.9%). On the other hand, the most commonly used words in the documents were observer (91), control (47), engine (47), based (42) and estimation (41).

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Brake discs: A technological review from its analysis and assessment
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García León, Ricardo Andres | 2019-10-31

Braking systems are undoubtedly the most important component for road safety, since it determines the total or partial stop of a vehicle and, therefore, guarantees the physical integrity of passengers. Normally, the front brake discs and the remaining percentage absorb 70% of the kinetic energy produced within a vehicle by the rear brake discs, which tend to have the formof a drum brake. These systems benefit from friction to stop a moving vehicle, under the umbrella of hydraulic pressure that pushes the brake pads against the iron-cast disk. In this document, concepts of famous authors around the world on analysis and evaluation of brake discs are provided, which are carried out using a descriptive methodology and an estimation of the characteristics of the brake disc. The review is carried out in computer assisted design through several existing CAD software in the industry, as the main methodology applied to the development of certain research projects, where different geometric characteristics of the brake discs are considered, as well as problems related to wear and corrosion. This research project has shown that it is vital to incorporate existing computer assisted design software to predict performance, improve components and optimize the functionality of the brake system. In this way, road traffic safety and systems efficiency are achieved, which are a matter of great importance for the industry. It is vital to analyze brake systems through Finite Element Analysis (FEA), with the intention of achieving a broader vision of its performance, since the information collected reveals that the geometric characteristics of the brake and cooling ducts influence the heat dissipation. It depends on the form, the type of material and the application, the heat generated between the pad and the brake. Therefore, the heat is dissipated rapidly according to the analysis performed mathematically by the researchers, which are compared with the made in computer assisted design software.

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Caracterización de la tasa de liberación de calor en los cilindros de un motor de generación a gas natural de 2 MW
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Valencia-Ochoa, Guillermo | 2020-01-01

Desarrollar modelos matemáticos para los motores de generación de energía más confiables que permitan proponer un uso eficiente de los combustibles y aumentar la eficiencia de conversión energética, se ha convertido en uno de los principales objetivos de los trabajos de investigación en el área. Con el fin de estudiar el fenómeno liberación de calor en los cilindros de un motor a gas natural J612 Jenbacher de 2 MW a partir de variables medias disponibles enregistros operacionales, se ha propuesto un modelo semifísico a partir de balances de masa, energía, ecuaciones constitutivas y regresiones estadísticas. Los resultados muestran que a partir del modelo propuesto del calor rechazado con un coeficiente de determinación de 0.99, el permiten alcanzar un error relativo máximo de 2% en modo isla y del 4% operando en red para la estimación de la temperatura de los gases a las salidas de los cilindros. Así mismo, el modelo permite determinar la fracción de calor perdido en los cilindros en función de la energía aportada por el gas natural.

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Caracterización Térmica de mezclas de arcillas utilizadas en la fabricación de productos de mampostería para la contrucción
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García León, Ricardo Andrés | 2018

Actualmente en Norte de Santander existe gran variedad de yacimientos naturales que se pueden utilizar para fabricar productos de mampostería para la construcción como lo son bloques, tejas, ladrillos, baldosas, entre otros; pero las empresas fabricantes obtienen muchos desperdicios debido a la falta de análisis tecnológicos de la materia prima para pronosticar el comportamiento de las pastas cerámicas y lograr mejorar la calidad del producto final. En el presente trabajo se realizó las caracterizaciones térmicas de dos mezclas de arcillas (m7 y m8) encontradas experimentalmente utilizando el método de moldeo de extrusión y en polvo para la fabricación de bloques H-10 tomando como muestra la materia prima (arcilla) de una empresa dedicada a la fabricación de bloques H-10 en Ocaña, Norte de Santander. El desarrollo de la investigación se llevó a cabo mediante la ejecución de ensayos térmicos a las muestras de arcillas con los que se determinaron los porcentajes pérdida de peso respecto a las temperaturas obtenidas en un diagrama con las curvas de ATD y ATG. Los resultados obtenidos demuestran que las mezcla m7 encontrada experimentalmente presenta mejores características en el proceso de cocción por lo que se estableció una curva de cocción óptima para la fabricación del bloque H-10 teniendo en cuenta las especificaciones del proceso productivo y la materia prima, con lo que se espera mejorar la calidad del producto final cumpliendo las especificaciones de las normas actuales vigentes. Es indispensable caracterizar las arcillas para optimizar la pasta de producción y evitar imperfecciones en el producto final (Bloque H-10) con lo que evidentemente se mejoraran los recursos ambientales y económicos de la empresa.

LEER
Caracterización térmica de mezclas de arcillas utilizadas en la fabricación de productos de mampostería para la construcción
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García León, Ricardo Andres | 2018

Actualmente en Norte de Santander existe gran variedad de yacimientos naturales que se pueden utilizar para fabricar productos de mampostería para la construcción como lo son bloques, tejas,ladrillos, baldosas, entre otros; pero las empresas fabricantes obtienen muchos desperdicios debido a la falta de análisis tecnológicos de la materia prima para pronosticar el comportamiento de las pastas cerámicas y lograr mejorar la calidad del productofinal. En el presente trabajo se realizó las caracterizaciones térmicas de dos mezclas de arcillas (m7 y m8) encontradas experimentalmente utilizando el método de moldeo de extrusión y en polvo para la fabricación de bloques H-10 tomando como muestra la materia prima (arcilla) de una empresa dedicada a la fabricación de bloques H-10 en Ocaña, Norte de Santander. El desarrollo de la investigación se llevó a cabo mediante la ejecución de ensayos térmicos a las muestras de arcillas con los que se determinaronlos porcentajes pérdida de peso respecto a las temperaturas obtenidas en un diagrama con las curvas de ATD y ATG. Los resultados obtenidos demuestran que las mezcla m7 encontrada experimentalmente presenta mejores características en el proceso de cocción por lo que se estableció una curva de cocción óptima para la fabricación del bloque H-10 teniendo en cuenta las especificaciones del proceso productivo y la materia prima, con lo que se espera mejorar la calidad del producto final cumpliendo las especificaciones de las normas actuales vigentes. Es indispensable caracterizar las arcillas para optimizar la pasta de producción y evitar imperfecciones en el producto final (Bloque H-10) con lo que evidentemente se mejoraran los recursos ambientales y económicos de la empresa.

LEER
CFD performance analysis for Darrieus Hydrokinetic Turbine
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Rolong Ortiz, Humberto | 2019-04-10

This work proposes the analysis of the behavior of a Darrieus type hydrokinetic turbine, starting from the mathematical model that allows to delimit the operation system, linking all the variables present in the phenomenon, specifically the fluid properties such as density, velocity, viscosity and Reynolds number. Also considered are the geometric data of the profiles, the rope length, cross-sectional area, angle of attack of the impeller, type of profile used and speed of rotation. The initial domain data, the flow area and the boundary conditions are selected to solve the model and thus obtain the data of the individual behavior of the selected profiles. For this, the lift and drag curves are obtained over a wide range of angles of attack. After characterizing the profile, the behavior of the impeller is simulated, calculating its power coefficient and consequently its performance.

LEER
CFD simulation of HPAM EOR solutions mechanical degradation by restrictions in turbulent flow
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Herrera Quintero, Julia Jineth | 2020-12-17

Polymer flooding is a widely used enhanced oil recovery (EOR) technology. The purpose of the polymer is to increase water viscosity to improve reservoir sweep efficiency. However, mechanical elements of the polymer injection facilities may impact the viscosity of the polymer negatively, decreasing it drastically. Mechanical degradation of the polymer occurs in case of flow restrictions with abrupt diameter changes in valves and control systems. Such flow restrictions may induce mechanical stresses along the polymer chain, which can result in its rupture. In this research, physical experiments and numerical simulations using CFD (Computational Fluid Dynamics) were used to propose a model for estimating the mechanical degradation for the flow of polymer solutions. This technique involves the calculation of velocity gradients, pressure drawdown, and polymer degradation of the fluid through geometry restriction. The simulations were validated through polymer injection experiments. The results show that with the greater volumetric flow and lower effective diameters, there is more mechanical degradation due to polymer shearing; nonetheless, this depends on the rheology properties inherent in each polymer in an aqueous solution. This method is suitable to estimate the mechanical degradation of the polymer solution in flooding facilities and accessories. Further, the results obtained could enhance the use of the polymer, calculating its actual mechanical degradation, minimizing it, or using it to support the development of new accessories.

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Clay surface characteristics using atomic force microscopy
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Acevedo Peñaloza, Carlos Humberto | 2018-06-07

The first component for the manufacture of masonry products used in construction is clay, which provides the plasticity that facilitates the molding and handling of the product. The second component is the feldspar in form of alumina (Al2O3) which is used as flux. The third one is silica (SiO2) which is used as a filling material and stabilizer. These elements are determined by chemical composition using fluorescence analysis or X-ray diffraction, which is the basis of the modern classification of minerals. Thereby, the main objective of this research is to study the surface characteristics of clay samples from an industrial company producing H-10 blocks in the region of Norte de Santander, by studying the surfaces of the samples selected through the analysis by Atomic Force Microscopy, in order to compare the results with those found in the literature, and at the same time taking into account the chemical elements in their highest composition. The results show that this is a technique that allows the identification of clay components, thus validating what has been found in physical and chemical analysis, expecting to provide a scientific contribution by AFM, because there is little information related to the characterization topography of clay materials.

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Combustion and performance study of low-displacement compression ignition engines operating with Diesel–Biodiesel blends
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Valencia, Guillermo | 2020-01-30

This study investigated the influence of different biodiesel blends produced from residual sunflower oil and palm oil from agroindustry liquid waste on the characteristics of the combustion process, performance, and emissions in a single-cylinder diesel engine. For the analysis of the combustion process, a diagnostic model was developed based on the cylinder pressure signal, which allows the calculation of the heat release rate, the accumulated heat rate, and the temperature in the combustion chamber. This is to assess the influence of these parameters on engine emissions. The experiments on the diesel engine were carried out using five types of fuel: conventional diesel, two biodiesel blends of residual palm oil (PB5 and PB10), and two biodiesel blends formed with palm oil and sunflower oil residues (PB5SB5 and PB10SB5). The engine was running in four different modes, which covered its entire operating area. Experimental results show that the in-cylinder pressure curves decrease as the percentage of biodiesel in the fuel increases. Similarly, the results showed a decrease in the heat release rate for biodiesel blends. The diagrams of the accumulated heat release curves were larger for fuels with higher biodiesel content. This effect is reflected in the thermal efficiency of biodiesel blends since the maximum thermal efficiencies were 29.4%, 30%, 30.6%, 31.2%, and 31.8% for PB10SB5, PB5SB5, PB10, PB5, and diesel, respectively. The emission analysis showed that the blends of biodiesel PB5SB5 and PB10SB allowed a greater reduction in the emissions of CO, CO2, HC, and opacity of smoke in all the modes of operation tested, in comparison with the blends of biodiesel PB5 and PB10. However, NOx emissions increased. In general, biodiesel with the percentage of residual sunflower oil does not cause a significant change in the combustion process and engine performance, when compared to biodiesel that includes only residual palm oil.

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A comparative study of the cutting parameter in milling process under different material
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Acevedo Peñaloza, Carlos Humberto | 2018-06-18

In the present study, the incidence of the variation in feed rate per tooth and depth of cut for SAE 4340 alloy steel and SAE J431 steel castings was analysed and in which material this variation is most noticeable. For this purpose, the machining process studied was milling. This is a machining operation in which a workpiece is passed in front of a rotating cylindrical tool with multiple cutting edges. For this study, the feed rate per tooth and depth of cut were varied by 4 values each. The feed rate ranged from 0.002 mm to 0.008 mm and the depth of 2 mm to 8 mm found that for both parameter variations cutting speeds always decrease with increasing both feed per tooth and depth of cut and that feed per tooth and depth of cut significantly affect process costs.

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Comparison of the Concentration Factor of Stresses on Flat Sheets with Two Holes with Low and High Speed Voltage Test
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Acevedo Peñaloza, Carlos Humberto | 2018-07-31

The research seeks to determine whether the stress concentration factor for flat plates with two stressed holes varies according to the application speed of the load. The research was developed using the experimental method, with two types of tests, one called low-speed load application and the other called high-speed load application. The behaviour of the theoretical stress concentration factor Kt has been studied on long flat plates with two holes under tension and made of isotropic material, with axial direction for the application of the vertical load. Different values were taken from the centre distance of the holes and it was found that the value of the stress concentrator Kt; for the two tests always tends to values greater than 3.8. A comparison was made between the results obtained and it was determined that there is variation between the values of the Kt factor according to the speed with which the load of the voltage test is applied, with the highest being the Kt with high speed test.

LEER
Comparison of the radius of curvature in the cams which used in the displacement law beziér curves and cyclic and harmonic curves
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Acevedo Peñaloza, Carlos Humberto | 2018-11-07

The work shows the radius of curvature for different variations of the angle of rotation β and of the ratio of Ro/L, the study is shown for the case in which the laws of displacement of the cams have been designed by Bézier curves and these results are compared with those obtained by harmonic and cyclic curves.

LEER
Computational fluid dynamics analysis of combined cycle power plant heat exchanger with OpenFOAM® software
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Cárdenas-Gutiérrez, Javier Alfonso | 2020-10

The heat exchangers application in combined cycle power plants is a key aspect in the thermal and fluid mechanics sciences due to their elevated functionality in industrial processes related to the quality and the efficiency in the power generation. Heat exchangers are employed in thermal processes in order to remove a significant heat flow and to maintain temperature values under different working conditions. Taking into account the above, numerical methodologies have been developed with the aim to study and analyze the heat exchanger performance based on the thermal states of its physical values in space and time. Experimental methods may be applied to create models and describe the flow behavior in function of mass flow rate, pressure, and flow temperature in different measure points of the finite volume. However, it is necessary to apply numerical methods linked to computational tools in order to generate a high flow description into the heat exchanger under real working conditions. Therefore, this paper proposes a numerical analysis of the flow transported into a heat exchanger with computational tools to predict its performance under real Combined Cycle Power Plant conditions through a virtual environment. Random number generator KEpsilon turbulence model and Eulerian – Eulerian multiphase model is coupled in a Computational Fluid Dynamics code to solve the system of the partial differential equations which describes the flow behavior and heat transfer into the heat exchanger, and numerical results have been compared against the experimental model in order to verify the flow prediction of the simulation methodology employed in this particular case. The good agreement reached between the models defines an inexpensive way to evaluate and optimize the heat exchanger performance by means of OpenFOAM software.

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Desarrollo de una metodología para la predicción de curvas características en bombas periféricas
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Valencia-Ochoa, Guillermo | 2020-05-01

Las bombas rotodinámicas han presentado un desarrollo muy notable en los últimos años; debido a esto, su implementación se ha diversificado ampliamente en aplicaciones industriales y domiciliarias. La modificación de los parámetros de operación que definen las características de la bomba regenerativa afecta directamente su eficiencia. Por otro lado, las curvas características que determinan el comportamiento hidráulico de una bomba son utilizadas para definir el punto de operación y escoger una bomba adecuada para las condiciones de funcionamiento de un sistema hidráulico. En este artículo, se presenta una metodología para ajustar la curva teórica de una bomba rotodinámica periférica utilizando factores que influyen en su desempeño considerando que limitaciones físicas que se presentan durante su operación afectan la precisión en la descripción del fenómeno. La ecuación de Euler es utilizada para determinar un conjunto de correlaciones que describen el comportamiento real de la bomba periférica tomando en cuenta la velocidad absoluta del alabe y la componente periférica de la velocidad del fluido que interactúa con el rodete; luego, los datos generados son utilizados para comparar la ecuación de la velocidad del flujo definida con la caracterización geométrica de una bomba regenerativa disponible en el mercado. Por último, se desarrolló una modificación en la ecuación teórica de Euler para predecir la curva real de la bomba regenerativa alcanzando un porcentaje de error menor al 5%.

LEER
Design of a ball burnishing tool with interchangeable tip
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Coba Salcedo, Milton Fabian | 2018-09-18

The following work was carried out with the goal of studying the functionality of a previously realized design of an interchangeable indenter tool for the ball burnishing process in a numerical control milling machine with several AISI 1045 specimens, to identify and corroborate changes in the final roughness obtained and the averages of the same material with the application of the process, in addition to finding improvements in the process times, to reduce the dead times that translate into lower costs, and an improvement in the surface finish.

LEER
Design of a mechanical seeder
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Ospina-Bayona, H E | 2019-11-19

In the agricultural production processes that are carried out in most of the Colombian regions, some deficiencies can be observed in the way in which the seeds are sown. This is a task that is carried out manually, generating physical problems in the workers due to the enormous effort that they must make, in addition to the precariousness in how these works are carried out. The long periods that are involved in sowing greatly hinder its efficiency, something that directly affects the economy of the farmers. The purpose of this work is to design a mechanical seeder that facilitates the work of the operators by eliminating the manual operation of it and equipping them with equipment that performs the furrows in the ground and at the same time sows the seed. The results obtained corroborate that there is an adequate structural design, which will support the forces to which the machine will be subjected. In this way, it will be possible to contribute to the improvement of the sowing conditions of the farmers of the region. This design takes into account the number of seeds sown per hectare, which is about 20 kg. These data were obtained from farmers belonging to the Universidad Francisco de Paula Santander seccional Ocaña. Additionally, maximum deformation analysis was performed on the chassis, obtaining values of 1.791×10−4 m, as well as structural analysis using the Solidworks drawing tool.

LEER