Mostrando ítems 1-7 de 7

2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM

Florez, Eder; Rojas Suárez, Jhan Piero; Espinel Blanco, Edwin (Italia, 2021)

Cold cutting processes are characterized to perform the kinetic energy needed to cut hard materials with little mechanical effort by means of the ultra-high flow pressure pumps, which produce water jets with a flow pressure ...
Analysis of the Tribological and Dynamic Characteristics of the Piston Compression Ring Under Different Engine Operating Conditions

Pardo García, Carlos Eduardo; PABON LEON, JHON ANTUNY; FONSECA VIGOYA, MARLEN DEL SOCORRO (International Review of Mechanical EngineeringItalia, 2021)

In this investigation, a study of the tribological and dynamic characteristics present in the compression ring is executed for different engine conditions. A series of numerical simulations has been carried out using the ...
CFD study of industrial safety valves in a virtual environment with OpenFOAM® software

Rojas Suárez, Jhan Piero; Cárdenas-Gutiérrez, Javier Alfonso; PABON LEON, JHON ANTUNY (International Review of Mechanical EngineeringItalia, 2020-11-30)

Numerical advances in the numerical analysis of safety valves have enabled the development of approximated predictions related to the hydraulic behavior of turbulent flows, which influence the mechanical behavior of the ...
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 ...
Non-Newtonian Behavior Effect on Gas-liquid Mass Transfer using an Anchor Impeller for CSTR Bioreactors: A CFD Approach

Niño, Lilibeth; Gelves, German; Peñuela, Mariana (Indian Journal of Science and TechnologyIndia, 2018-11)

Objectives: kL a mass transfer coefficient was predicted using CFD (computational fluid dynamics) for analyzing non-newtonian effects on gas liquid mass transfer in a 10 L bioreactor stirred with an Anchor Impeller. ...
Parametric analysis CFD of the hydraulic performance of a centrifugal pump with applications to the dredging industry

Cárdenas-Gutiérrez, Javier Alfonso; Valencia Ochoa, Guillermo; Duarte Forero, Jorge (Journal of Engineering Science and Technology ReviewGrecia, 2020-06-20)

The present study aims to use the analysis of CFD in a centrifugal dredge pump, to predict by mathematical correlations the effect that changes in the main variables of the dredging process would have on the behavior and ...
Thermohydraulic and Economic Evaluation of a New Design for Printed Circuit Heat Exchangers in Supercritical CO2 Brayton Cycle

Villada Castillo, Dora Clemencia; Valencia, Guillermo; Duarte Forero, Jorge (Energies, 2023-02-28)

The present study focused on the analysis of a new geometrical modification of the conventional zig-zag channel for Printed Circuit Heat Exchangers. The research was carried out using OpenFOAM and Salome software, which ...

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2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM
...
Florez, Eder | 2021

Cold cutting processes are characterized to perform the kinetic energy needed to cut hard materials with little mechanical effort by means of the ultra-high flow pressure pumps, which produce water jets with a flow pressure value of around 90 ksi. These manufacturing processes may be studied considering the fluid mechanics' principles that describe the transport phenomena for inviscid, continuous, and incompressible laminar flows in order to obtain theoretical results approximated to the process conditions. In this sense, the numerical modeling techniques applied in the analysis of water jet cutting processes define an efficient solution of the processes due to the physical analysis of the partial differential equations, which quantify the abrasive flow particles into the system. Taking into account the above, this research proposes a numerical analysis of the physical phenomena through the two-phase flow simulation in steady state with OpenFOAM. Abrasive and liquid phases are quantified to study the turbulent values, which describe the water jet behavior under different working conditions. A 2D model has been computed and discretized, considering the nozzle features in order to visualize and predict the abrasive mixture and flow rejected by using a low computational effort. Therefore, this numerical approach has been validated with a mesh independency analysis developed to verify the relation between the numerical data and the finite number of nodes computed in order to discretize a computational domain and to solve analytically the system proposed until reaching a high approximation between the model and the experimental values obtained during the cutting process by means of abrasive flows.

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Analysis of the Tribological and Dynamic Characteristics of the Piston Compression Ring Under Different Engine Operating Conditions
...
Pardo García, Carlos Eduardo | 2021

In this investigation, a study of the tribological and dynamic characteristics present in the compression ring is executed for different engine conditions. A series of numerical simulations has been carried out using the OpenFOAM software for the study. The simulation conditions have been based on the parameters measured on a diesel engine test bench. Different ranges of rotation speed, load, and lubrication oil temperature have been established for the analysis. The results show that the parameters of rotation speed and engine load significantly influence the tribological and dynamic conditions of the piston compression ring. An increase of 425 rpm and 136 Nm in the rotational speed and load of the engine causes an increase of 13% and 34% in the power loss due to friction. The Top Dead Center and the Bottom Dead Center are the locations most prone to experience critical wear and tear. Increasing the lubricating oil temperature increases the maximum friction force by 9%. In general, the proposed methodology allows for establishing a direct relationship between the operating conditions and the tribological characteristics in the compression ring that directly affect the efficiency and useful life of the engine.

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CFD study of industrial safety valves in a virtual environment with OpenFOAM® software
...
Rojas Suárez, Jhan Piero | 2020-11-30

Numerical advances in the numerical analysis of safety valves have enabled the development of approximated predictions related to the hydraulic behavior of turbulent flows, which influence the mechanical behavior of the main components coupled to the pneumatic system. Therefore, many studies have focused on the numerical analysis of the safety valves responsible for maintaining the system integrity subject to high-pressure values under real working conditions in a virtual and inexpensive environment through the CFD codes application with OpenFOAM software. Therefore, this paper is based on the technological prediction of the laminar or turbulent flows into a safety valve through the solution of the partial differential equations system, which describes the physical state of the pressure and mass flow rate in space and time. IcoFOAM solver has been applied to model the main flow fluctuations taken, considering the mean values of the pneumatic system. A mesh independence study has been used to compute and define the finite number of nodes and cells that discretize the continuous computational domain of the internal flow and generate an approximated numerical prediction of the safety valve performance, maintaining a low computational cost during the iterative solution of the conservation equations developed with computational tools. In this sense, the RANS KEpsilon approach has defined a high prediction of the turbulent flow behavior in a virtual environment with an error rate close to the 2 percent value between the numerical and the experimental models. This research shows a good agreement in the understanding of the physical phenomena with the computational tool application based on advanced theories of thermal and fluid mechanics sciences in a virtual environment.

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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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Non-Newtonian Behavior Effect on Gas-liquid Mass Transfer using an Anchor Impeller for CSTR Bioreactors: A CFD Approach
...
Niño, Lilibeth | 2018-11

Objectives: kL a mass transfer coefficient was predicted using CFD (computational fluid dynamics) for analyzing non-newtonian effects on gas liquid mass transfer in a 10 L bioreactor stirred with an Anchor Impeller. Methods/Statistical Analysis: The set up bioreactor configurations were defined by typical culturing conditions used for fungi organism. Bubble breakage frequency and coalescence rate were simulated using Luo - Colaloglou and Tavlarides models and PBM approaches, respectively. Simulated results from different shear rates due to non-newtonian behaviour are compared by analyzing its influences in bubble size and power input. Findings: A clear relationship between high levels of shear rates and small bubble sizes is found in this work. The later is also associated with the high values of kL a simulated (270 h-1) and compared to levels found at low shear rates (62 h-1). Application/Improvements: Impressed by these findings new design optimizations for non-newtonian bioprocessing applications would be improved using CFD.

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Parametric analysis CFD of the hydraulic performance of a centrifugal pump with applications to the dredging industry
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Cárdenas-Gutiérrez, Javier Alfonso | 2020-06-20

The present study aims to use the analysis of CFD in a centrifugal dredge pump, to predict by mathematical correlations the effect that changes in the main variables of the dredging process would have on the behavior and efficiency of the pump. The OpenFOAM® open source software is used for the development of the study, through which a series of operating conditions that the dredging pump experiences in its operation were reproduced. The information collected from the output variables in the pump allowed us through statistical analysis, the development of mathematical correlations that allow us to directly identify the relationships between the process variables and their influence on the pump behavior (suction pressure, discharge pressure, total dynamic head, NPSHr and efficiency). The results obtained indicate that the simulation process allows a high prediction to be obtained with respect to the actual pump conditions (error below 4%). Mathematical correlations demonstrated efficiency for the operating range of work from 83% to 64%. Additionally, the NPSHr analysis allows defining operating limits that avoid adverse effects such as cavitation.

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Thermohydraulic and Economic Evaluation of a New Design for Printed Circuit Heat Exchangers in Supercritical CO2 Brayton Cycle
...
Villada Castillo, Dora Clemencia | 2023-02-28

The present study focused on the analysis of a new geometrical modification of the conventional zig-zag channel for Printed Circuit Heat Exchangers. The research was carried out using OpenFOAM and Salome software, which were used for the CFD analysis and the construction of the computational domain. For the development of the study, three types of channel geometries were defined: a modified zig-zag channel, a conventional zig-zag channel, and a straight channel. The results show that the modified zig-zag channel achieves better thermal hydraulic performance compared to that of the conventional zig-zag channel, evidenced by a 7.6% increase in the thermal performance factor. The modified zig-zag channel proposed in the research caused a 1.5% reduction of the power consumption of supercritical Brayton cycle compressors. Additionally, the modified zig-zag channel achieves a maximum efficiency of 49.1%, which is 1.5% higher compared to that of the conventional zig-zag channel. The above results caused a 20.9% reduction of the operating costs of the supercritical Brayton cycle. This leads to a 5.9% decrease in the cost associated with using the PCHE compared to that of the conventional zig-zag channel. In general, the new geometric characteristics proposed for the conventional zig-zag channel minimize the high loss of the hydraulic performance without significantly compromising its heat transfer capacity. The geometric analysis of the proposed new zig-zag channel geometry was limited to evaluating the influence of the bend angle of 20–30◦ . Therefore, a more detailed geometric optimization process involving other geometric parameters of the channel is still needed. Future research will be focused on addressing this approach

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Listar por tema "CFD"

2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM

Analysis of the Tribological and Dynamic Characteristics of the Piston Compression Ring Under Different Engine Operating Conditions

CFD study of industrial safety valves in a virtual environment with OpenFOAM® software

Computational fluid dynamics analysis of combined cycle power plant heat exchanger with OpenFOAM® software

Non-Newtonian Behavior Effect on Gas-liquid Mass Transfer using an Anchor Impeller for CSTR Bioreactors: A CFD Approach

Parametric analysis CFD of the hydraulic performance of a centrifugal pump with applications to the dredging industry

Thermohydraulic and Economic Evaluation of a New Design for Printed Circuit Heat Exchangers in Supercritical CO2 Brayton Cycle

Envíos recientes

2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM

Analysis of the Tribological and Dynamic Characteristics of the Piston Compression Ring Under Different Engine Operating Conditions

CFD study of industrial safety valves in a virtual environment with OpenFOAM® software

Computational fluid dynamics analysis of combined cycle power plant heat exchanger with OpenFOAM® software

Non-Newtonian Behavior Effect on Gas-liquid Mass Transfer using an Anchor Impeller for CSTR Bioreactors: A CFD Approach

Parametric analysis CFD of the hydraulic performance of a centrifugal pump with applications to the dredging industry

Thermohydraulic and Economic Evaluation of a New Design for Printed Circuit Heat Exchangers in Supercritical CO2 Brayton Cycle

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Listar por tema "CFD"

2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM ﻿

Analysis of the Tribological and Dynamic Characteristics of the Piston Compression Ring Under Different Engine Operating Conditions ﻿

CFD study of industrial safety valves in a virtual environment with OpenFOAM® software ﻿

Computational fluid dynamics analysis of combined cycle power plant heat exchanger with OpenFOAM® software ﻿

Non-Newtonian Behavior Effect on Gas-liquid Mass Transfer using an Anchor Impeller for CSTR Bioreactors: A CFD Approach ﻿

Parametric analysis CFD of the hydraulic performance of a centrifugal pump with applications to the dredging industry ﻿

Thermohydraulic and Economic Evaluation of a New Design for Printed Circuit Heat Exchangers in Supercritical CO2 Brayton Cycle ﻿

Envíos recientes

2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM

Analysis of the Tribological and Dynamic Characteristics of the Piston Compression Ring Under Different Engine Operating Conditions

CFD study of industrial safety valves in a virtual environment with OpenFOAM® software

Computational fluid dynamics analysis of combined cycle power plant heat exchanger with OpenFOAM® software

Non-Newtonian Behavior Effect on Gas-liquid Mass Transfer using an Anchor Impeller for CSTR Bioreactors: A CFD Approach

Parametric analysis CFD of the hydraulic performance of a centrifugal pump with applications to the dredging industry

Thermohydraulic and Economic Evaluation of a New Design for Printed Circuit Heat Exchangers in Supercritical CO2 Brayton Cycle

Portales Institucionales

2D Simulation of Two-Phase Flow for Water Jet Cutting Processes with OpenFOAM

Analysis of the Tribological and Dynamic Characteristics of the Piston Compression Ring Under Different Engine Operating Conditions

CFD study of industrial safety valves in a virtual environment with OpenFOAM® software

Computational fluid dynamics analysis of combined cycle power plant heat exchanger with OpenFOAM® software

Non-Newtonian Behavior Effect on Gas-liquid Mass Transfer using an Anchor Impeller for CSTR Bioreactors: A CFD Approach

Parametric analysis CFD of the hydraulic performance of a centrifugal pump with applications to the dredging industry

Thermohydraulic and Economic Evaluation of a New Design for Printed Circuit Heat Exchangers in Supercritical CO2 Brayton Cycle