Analysis of Water Condensation and Twophase Flow in a Channel Relevant for Plate Heat Exchangers
(2006) In Advanced Computational Methods in Heat Transfer IX 53. p.351360 Abstract
 Water vapor condensation and twophase 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 liquidvapor interface boundary. In particular, a singularlink behaviour in NavierStokes (NS) 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 highresolution calculations and detailed analysis are required. In this study, a computational fluid dynamics (CFD) approach is presented for... (More)
 Water vapor condensation and twophase 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 liquidvapor interface boundary. In particular, a singularlink behaviour in NavierStokes (NS) 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 highresolution calculations and detailed analysis are required. In this study, a computational fluid dynamics (CFD) approach is presented for analysis of water vapor condensation and twophase 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 twophase fields. The water phase change and twophase flow are treated by employing a water liquidphase 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 twophase region are calculated and updated based on the calculated value of the liquidphase 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 twophase flow in the channel, in terms of liquidwater fraction factor distribution. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/621116
 author
 Yuan, Jinliang ^{LU} ; Wilhelmsson, Charlotte ^{LU} and Sundén, Bengt ^{LU}
 organization
 publishing date
 2006
 type
 Chapter in Book/Report/Conference proceeding
 publication status
 published
 subject
 in
 Advanced Computational Methods in Heat Transfer IX
 editor
 Sundén, Bengt and
 volume
 53
 pages
 351  360
 publisher
 WIT Press
 external identifiers

 wos:000239953800034
 scopus:36148943217
 ISBN
 1845641760
 DOI
 10.2495/HT060341
 language
 English
 LU publication?
 yes
 id
 2f7ed5a7ccfc41ac9baf8f9b9d9e156a (old id 621116)
 alternative location
 http://library.witpress.com/pages/PaperInfo.asp?PaperID=16591
 date added to LUP
 20080218 08:27:29
 date last changed
 20170409 04:37:33
@inproceedings{2f7ed5a7ccfc41ac9baf8f9b9d9e156a, abstract = {Water vapor condensation and twophase 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 liquidvapor interface boundary. In particular, a singularlink behaviour in NavierStokes (NS) 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 highresolution calculations and detailed analysis are required. In this study, a computational fluid dynamics (CFD) approach is presented for analysis of water vapor condensation and twophase 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 twophase fields. The water phase change and twophase flow are treated by employing a water liquidphase 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 twophase region are calculated and updated based on the calculated value of the liquidphase 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 twophase flow in the channel, in terms of liquidwater fraction factor distribution.}, author = {Yuan, Jinliang and Wilhelmsson, Charlotte and Sundén, Bengt}, booktitle = {Advanced Computational Methods in Heat Transfer IX}, editor = {Sundén, Bengt}, isbn = {1845641760}, language = {eng}, pages = {351360}, publisher = {WIT Press}, title = {Analysis of Water Condensation and Twophase Flow in a Channel Relevant for Plate Heat Exchangers}, url = {http://dx.doi.org/10.2495/HT060341}, volume = {53}, year = {2006}, }