Mostrando ítems 35-40 de 40

Simulation study of phase change materials operating in thermoelectric devices

Orjuela Abril, Martha Sofia ; Pabón León, J A; Rojas Suárez, J P (Reino Unido, 2021-06-04)

In this paper, a computerized analysis is performed to evaluate the effect of phase change materials on the performance of thermoelectric generators. This study was conducted using commercial OpenFOAM software. Analyze ...
Statistical analysis of wastewater monitoring for maximum peak factor estimation

calixto, nelson javier; Bonilla, Carlos; Rojas Suárez, Jhan Piero (Journal of Physics: Conference SeriesReino Unido, 2021-08-09)

The design and operation of sanitary sewerage systems are based on the knowledge of peak and the average daily wastewater flows. The maximum peak factor is obtained through the ratio of the maximum flow and the average ...
Study of performance and emissions in diesel engines operating with biodiesel from soybean oil and water emulsions

Orjuela Abril, Martha Sofia ; Rojas Suárez, Jhan Piero; Duarte Forero, Jorge (Aibi, Revista de Investigacion Administracion e IngenieriasCúcuta, Colombia, 2021-01-01)

Este estudio evalúa la influencia en el proceso de combustión, consumo de combustible y emisiones contaminantes en un motor diesel, que opera con biodiesel a partir de aceite de soja y emulsiones de agua con porcentajes ...
Technical feasibility study for the implementation of pedestrian safety mechanisms

Rojas Suárez, Jhan Piero; Orjuela Abril, Martha Sofia ; Prada Botia, Gaudy Carolina (Journal of Physics: Conference SeriesReino Unido, 2019-11-19)

The increase in distractions when driving or walking on a road has proportionally increased the number of accidents that occur each year, with pedestrians being the most affected. For this reason, an attempt is made to ...
Unsaturated Hydraulic Conductivity in Composite Porous Media

Piero Rojas, Jhan; Ruge, Juan Carlos; Carrillo, Gustavo Adolfo (Applied SciencesSuiza, 2022-09-09)

Determining the constitutive properties that describe the incipient hydraulic behavior of the materials, including the matrix domains and the distribution of macro and micropores, is crucial to analyzing the preferential ...
Vehicular flow analysis and diagnosis of the public transport

Rojas Suárez, Jhan Piero; Orjuela Abril, Martha Sofia ; Prada Botia, Gaudy Carolina (Journal of Physics: Conference SeriesReino Unido, 2019-02-13)

Public transport is one of the major means of mobilization for the general population of a country, achieving great importance to its policies of mobilization and economic analysis because it creates controversy to have a ...

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Simulation study of phase change materials operating in thermoelectric devices
...
Orjuela Abril, Martha Sofia | 2021-06-04

In this paper, a computerized analysis is performed to evaluate the effect of phase change materials on the performance of thermoelectric generators. This study was conducted using commercial OpenFOAM software. Analyze changes in temperature, potential and efficiency due to phase change materials. The study evaluated a variety of geometric and operational conditions, such as changes in material height and heat flux. The results obtained indicate that the presence of phase change material allows a significant increase in the temperature difference between the surfaces. The temperature difference is increased by 35% with a height of 3.25 mm. The temperature difference increases the potential of the thermoelectric generator and increases the maximum output voltage by 21%. Overall, phase change materials have been shown to improve thermoelectric efficiency by 23%. For test conditions, the maximum efficiency is 4.77%. From this result, it can be concluded that the phase change material is a promising alternative for improving the low efficiency of thermoelectric generators due to their heat storage capacity.

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Statistical analysis of wastewater monitoring for maximum peak factor estimation
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calixto, nelson javier | 2021-08-09

The design and operation of sanitary sewerage systems are based on the knowledge of peak and the average daily wastewater flows. The maximum peak factor is obtained through the ratio of the maximum flow and the average discharge flow of wastewater generated in a system. In this sense, the maximum peak factor was estimated by monitoring wastewater flow in an urban sector of the city of San José de Cúcuta, Colombia. This urban sector represents 45.6% of the sanitary sewerage of the city. Stochastic modeling of the peak flow was performed, and a mathematical model was constructed to estimate the maximum peak factor using a correlational study using statistical methodology. Through linear regression analysis, a model was obtained that estimates the value of the maximum peaking factor based on knowledge of the average daily wastewater flow. The results indicate that the model is potential, and the expression is statistically significant and satisfies the assumptions established for the classical linear regression model.

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Study of performance and emissions in diesel engines operating with biodiesel from soybean oil and water emulsions
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Orjuela Abril, Martha Sofia | 2021-01-01

Este estudio evalúa la influencia en el proceso de combustión, consumo de combustible y emisiones contaminantes en un motor diesel, que opera con biodiesel a partir de aceite de soja y emulsiones de agua con porcentajes de 4% y 8%. Para este estudio, se utiliza un motor diesel estacionario que opera en cuatro condiciones de par diferentes y una velocidad de rotación fija de 3400 rpm. Los combustibles de prueba son diésel, biodiésel de aceite de soja y emulsiones de agua SB4W y SB8W. Los resultados indican que SB4W y SB8W provocan una reducción del 6% en el poder calorífico y un aumento del 18% y del 1% en la viscosidad y densidad. Sin embargo, la presencia de agua en el biodiésel puede ayudar a reducir el BSFC del motor en un 8%. El SB4W y SB8W permiten una reducción del 23% en las emisiones de NOx. Con el uso de combustible SB4W se obtiene una reducción del 16%, 29% y 14% en CO, HC y opacidad del humo en comparación con el biodiésel de aceite de soja. Se recomienda la inclusión máxima de 8% de agua en el biodiesel de aceite de soja ya que un porcentaje mayor puede provocar la presencia de combustiones incompletas.

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Technical feasibility study for the implementation of pedestrian safety mechanisms
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Rojas Suárez, Jhan Piero | 2019-11-19

The increase in distractions when driving or walking on a road has proportionally increased the number of accidents that occur each year, with pedestrians being the most affected. For this reason, an attempt is made to study the characteristics of a vehicle road, identifying the critical points and road sections of maximum demand of the inhabitants, who are the ones most in need of pedestrian crossings. For this reason, a statistical and technical study of traffic is proposed by means of vehicular gauges with respect to the most representative days that help to determine quantitatively the vehicular flow that circulates through this road corridor, by means of graphs, tables that help to identify the statistical data without still leaving aside the importance of a study of pedestrian traffic by means of a count in typical days of mobilization with the purpose of determining the pedestrian volume, due to its increase in the indexes of accidents caused by different types of transport, in which the motorcycles stand out.

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Unsaturated Hydraulic Conductivity in Composite Porous Media
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Piero Rojas, Jhan | 2022-09-09

Determining the constitutive properties that describe the incipient hydraulic behavior of the materials, including the matrix domains and the distribution of macro and micropores, is crucial to analyzing the preferential water flow in saturated soils, ks, and unsaturated, ku. This study focused on determining the hydraulic conductivity in porous media under total and partial saturation conditions. The infiltration characteristics of three reconstituted soils were evaluated using five suction ranges employing conventional permeameters, an automated dual system, and mini-disk infiltrometers. The experimental cycles were carried out in granular soils with mixtures of diatomaceous soils, iron oxide (Fe2O3 ), and calcium carbonate (CaCO3 ) in 5–40% proportions. The differences between the granular microstructures of each material and the different hydraulic interaction mechanisms (suctione levels) significantly affected the values of ks and ku and the coupling between the pore domains and the defined water regime. Additionally, a lower impact was observed in the data set exposed to higher percentages of Fe2O3 and CaCO3 in different suction ranges, mainly due to a tension effect (meniscus) generated by suction in the granular skeleton. Since both parameters are mutually correlated and have a similar impact between methods and soil cores, ks and ku must be optimized simultaneously in each mechanism analyzed. The main findings of this work result in the confirmation that the unsaturated permeability decreases as suction is imposed on the sample. As well as the addition of different materials with Particle Size Distribution finer than the base sample, it also reveals a reduction in hydraulic conductivity, both saturated and unsaturated.

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Vehicular flow analysis and diagnosis of the public transport
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Rojas Suárez, Jhan Piero | 2019-02-13

Public transport is one of the major means of mobilization for the general population of a country, achieving great importance to its policies of mobilization and economic analysis because it creates controversy to have a poor quality of service, directly affecting the users and drivers of these means. Due to the above, an alternative is proposed for the decongestion of main public transport routes, presenting the degree of saturation and the performance index that can create different alternative routes by moving a percentage of the routes in the city of Cúcuta, Colombia. In order to evaluate the effectiveness of this solution, information was collected by means of surveys for users and drivers, analyzing the data with the SPSS version 21 software, manifesting that there is low quality in public transport. In this way, the final characteristics of this method are evaluated in the new alternatives and in the problem sector, satisfying the quality requirements of public transport worldwide.

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Listar Infraestructura Vial - GINFRAVIAL por título

Simulation study of phase change materials operating in thermoelectric devices

Statistical analysis of wastewater monitoring for maximum peak factor estimation

Study of performance and emissions in diesel engines operating with biodiesel from soybean oil and water emulsions

Technical feasibility study for the implementation of pedestrian safety mechanisms

Unsaturated Hydraulic Conductivity in Composite Porous Media

Vehicular flow analysis and diagnosis of the public transport

Envíos recientes

Simulation study of phase change materials operating in thermoelectric devices

Statistical analysis of wastewater monitoring for maximum peak factor estimation

Study of performance and emissions in diesel engines operating with biodiesel from soybean oil and water emulsions

Technical feasibility study for the implementation of pedestrian safety mechanisms

Unsaturated Hydraulic Conductivity in Composite Porous Media

Vehicular flow analysis and diagnosis of the public transport

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Listar Infraestructura Vial - GINFRAVIAL por título

Simulation study of phase change materials operating in thermoelectric devices ﻿

Statistical analysis of wastewater monitoring for maximum peak factor estimation ﻿

Study of performance and emissions in diesel engines operating with biodiesel from soybean oil and water emulsions ﻿

Technical feasibility study for the implementation of pedestrian safety mechanisms ﻿

Unsaturated Hydraulic Conductivity in Composite Porous Media ﻿

Vehicular flow analysis and diagnosis of the public transport ﻿

Envíos recientes

Simulation study of phase change materials operating in thermoelectric devices

Statistical analysis of wastewater monitoring for maximum peak factor estimation

Study of performance and emissions in diesel engines operating with biodiesel from soybean oil and water emulsions

Technical feasibility study for the implementation of pedestrian safety mechanisms

Unsaturated Hydraulic Conductivity in Composite Porous Media

Vehicular flow analysis and diagnosis of the public transport

Portales Institucionales

Simulation study of phase change materials operating in thermoelectric devices

Statistical analysis of wastewater monitoring for maximum peak factor estimation

Study of performance and emissions in diesel engines operating with biodiesel from soybean oil and water emulsions

Technical feasibility study for the implementation of pedestrian safety mechanisms

Unsaturated Hydraulic Conductivity in Composite Porous Media

Vehicular flow analysis and diagnosis of the public transport