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Analysis of Water Condensation and Two-phase Flow in a Channel Relevant for Plate Heat Exchangers

Yuan, Jinliang LU ; Wilhelmsson, Charlotte LU and Sundén, Bengt LU (2006) In Advanced Computational Methods in Heat Transfer IX 53. p.351-360
Abstract
Water vapor condensation and two-phase flow appear in plate heat exchangers being used as condensers. Analysis of water phase change and flow dynamics is an important but complicated task due to large change in water physical/transport properties across the water liquid-vapor interface boundary. In particular, a singular-link behaviour in Navier-Stokes (N-S) equations is present due to the large step change in the density when computational simulation methods are applied. Conventional methods using ensemble averaged parameters such as void fraction are impossible to be applied to cases where high-resolution calculations and detailed analysis are required. In this study, a computational fluid dynamics (CFD) approach is presented for... (More)
Water vapor condensation and two-phase flow appear in plate heat exchangers being used as condensers. Analysis of water phase change and flow dynamics is an important but complicated task due to large change in water physical/transport properties across the water liquid-vapor interface boundary. In particular, a singular-link behaviour in Navier-Stokes (N-S) equations is present due to the large step change in the density when computational simulation methods are applied. Conventional methods using ensemble averaged parameters such as void fraction are impossible to be applied to cases where high-resolution calculations and detailed analysis are required. In this study, a computational fluid dynamics (CFD) approach is presented for analysis of water vapor condensation and two-phase flow in a channel relevant for plate heat exchanger parallel plates. The developed model is based on the governing equations which are directly solved for the entire single- and two-phase fields. The water phase change and two-phase flow are treated by employing a water liquid-phase fraction factor based on the total enthalpy in each computational cell. The factor is defined as the ratio of the total enthalpy differential to the latent heat of condensation. The density, viscosity and conductivity of the two-phase region are calculated and updated based on the calculated value of the liquid-phase fraction factor until a converged result is reached. It is revealed that, among others, the inlet vapor velocity has significant effects on the water phase change and two-phase flow in the channel, in terms of liquid-water fraction factor distribution. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Advanced Computational Methods in Heat Transfer IX
editor
Sundén, Bengt
volume
53
pages
351 - 360
publisher
WIT Press
external identifiers
  • WOS:000239953800034
  • Scopus:36148943217
ISBN
1-84564-176-0
DOI
10.2495/HT060341
language
English
LU publication?
yes
id
2f7ed5a7-ccfc-41ac-9baf-8f9b9d9e156a (old id 621116)
alternative location
http://library.witpress.com/pages/PaperInfo.asp?PaperID=16591
date added to LUP
2008-02-18 08:27:29
date last changed
2016-10-13 04:40:43
@misc{2f7ed5a7-ccfc-41ac-9baf-8f9b9d9e156a,
  abstract     = {Water vapor condensation and two-phase flow appear in plate heat exchangers being used as condensers. Analysis of water phase change and flow dynamics is an important but complicated task due to large change in water physical/transport properties across the water liquid-vapor interface boundary. In particular, a singular-link behaviour in Navier-Stokes (N-S) equations is present due to the large step change in the density when computational simulation methods are applied. Conventional methods using ensemble averaged parameters such as void fraction are impossible to be applied to cases where high-resolution calculations and detailed analysis are required. In this study, a computational fluid dynamics (CFD) approach is presented for analysis of water vapor condensation and two-phase flow in a channel relevant for plate heat exchanger parallel plates. The developed model is based on the governing equations which are directly solved for the entire single- and two-phase fields. The water phase change and two-phase flow are treated by employing a water liquid-phase fraction factor based on the total enthalpy in each computational cell. The factor is defined as the ratio of the total enthalpy differential to the latent heat of condensation. The density, viscosity and conductivity of the two-phase region are calculated and updated based on the calculated value of the liquid-phase fraction factor until a converged result is reached. It is revealed that, among others, the inlet vapor velocity has significant effects on the water phase change and two-phase flow in the channel, in terms of liquid-water fraction factor distribution.},
  author       = {Yuan, Jinliang and Wilhelmsson, Charlotte and Sundén, Bengt},
  editor       = {Sundén, Bengt},
  isbn         = {1-84564-176-0},
  language     = {eng},
  pages        = {351--360},
  publisher    = {ARRAY(0x8edac10)},
  series       = {Advanced Computational Methods in Heat Transfer IX},
  title        = {Analysis of Water Condensation and Two-phase Flow in a Channel Relevant for Plate Heat Exchangers},
  url          = {http://dx.doi.org/10.2495/HT060341},
  volume       = {53},
  year         = {2006},
}