Numerical Simulation of Two-Phase Flow and Heat Transfer in a Composite Duct

2003 ◽  
Author(s):  
Jinliang Yuan ◽  
Bengt Sunde´n
Keyword(s):  
Heat Transfer ◽  
Boundary Conditions ◽  
Phase Change ◽  
Porous Layer ◽  
Liquid Water ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Flow And Heat Transfer ◽  
Flow Duct

In this work, a three-dimensional computational method has been further developed for a composite duct, to analyze water phase change and liquid water saturation level, two-phase flow and heat transfer in a multi-component mixture. The duct under consideration consists of a flow duct, porous layer and solid structure. Advanced boundary conditions are applied in the analysis, concerning the thermal boundary conditions, mass consumption and generation appearing on the active surface, interfacial conditions between the flow duct and the porous layer etc. The coupled effects of species composition, mass transfer, phase change/balance have been taken into account. It has been found that the two-phase flow is sensitive to the operating parameters, and liquid water transport is dominated by diffusion in the porous layer, based on its mass composition gradient.

Numerical Simulation of Two Phase Flow and Heat Transfer in CPL Condenser With Porous Wick

2008 ◽  
Author(s):  
ZhiChun Liu ◽  
Wei Liu ◽  
JinGuo Yang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Phase Change ◽  
Two Phase Flow ◽  
Pressure Oscillation ◽  
Simulation Method ◽  
Phase Flow ◽  
Two Phase ◽  
Porous Wick ◽  
Flow And Heat Transfer

In the present paper, the Volume of Fluid (VOF) method is introduce to model the two phase flow and heat transfer with phase change in CPL condenser with porous element and the effect of different wall temperature and inlet vapor velocity to condensation phase change interface was studied with numerical simulation method. The results present that a fixed condensation physical interface can be formed on the face of porous wick, which can restrain, even eliminate the pressure oscillation. The reason of the effects are also analysed in this paper.

CFD Analysis of Two-Phase Flow and Convective Heat Transfer in PEMFC Ducts

2008 ◽  
Author(s):  
Jinliang Yuan ◽  
Huamin Zhang ◽  
Bengt Sunde´n
Keyword(s):  
Heat Transfer ◽  
Boundary Conditions ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Porous Layer ◽  
Two Phase Flow ◽  
Active Surface ◽  
Main Stream ◽  
Phase Flow ◽  
Two Phase

In this study, a three-dimensional computational method was developed to predict convective heat transfer combined with water phase change/two-phase flow in a PEMFC cathode duct. Momentum, heat transport and species equations have been solved by coupled source terms and thermo-physical properties of the multi-component mixture. Advanced boundary conditions are applied at the cathode duct external walls in the analysis, i.e., combined thermal boundary conditions of heat flux on the active surface and thermal insulation on the remaining solid walls. Moreover, effects of mass consumption and generation appearing on the active surface are implemented. The calculated results reveal that the thermal conditions at the interfaces vary along the main stream, and a big permeability of the porous layer promotes the bulk gas transport and the generated liquid water removal via the bottom interface between the flow duct and the porous layer, and a big convective heat transfer coefficient as well.

scholarly journals Two-Phase Flow and Heat Transfer Enhancement

2013 ◽  
Vol 5 ◽  
pp. 256839
Author(s):  
Somchai Wongwises ◽  
Afshin J. Ghajar ◽  
Kwok-wing Chau ◽  
Octavio García Valladares ◽  
Balaram Kundu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Transfer Enhancement ◽  
Two Phase ◽  
Flow And Heat Transfer
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