Water condensation and twophase flow modeling for a plate heat exchanger channel
(2008) ASME International Mechanical Engineering Congress and Exposition, 2007 In Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2007, vol 8, pts A and B  Heat Transfer, Fluid Flows and Thermal Systems p.349354 Abstract
 There are water vapour condensation and twophase flow in plate heat exchangers when they are used as condensers. Water phase change and flow dynamics modelling is an important but complicated task due to large change in water physical/transport properties across the water liquidvapour interface boundary. In particular, singularlink behaviour in governing equations is present due to the large step change in the density when computational fluid dynamics (CFD) is employed. 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 CFD approach is employed to model water vapour condensation and... (More)
 There are water vapour condensation and twophase flow in plate heat exchangers when they are used as condensers. Water phase change and flow dynamics modelling is an important but complicated task due to large change in water physical/transport properties across the water liquidvapour interface boundary. In particular, singularlink behaviour in governing equations is present due to the large step change in the density when computational fluid dynamics (CFD) is employed. 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 CFD approach is employed to model water vapour 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 thermalphysical properties, such as 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 concluded that, among others, the inlet vapour 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/1407365
 author
 Wilhelmsson, Charlotte ^{LU} ; Yuan, Jinliang ^{LU} and Sundén, Bengt ^{LU}
 organization
 publishing date
 2008
 type
 Chapter in Book/Report/Conference proceeding
 publication status
 published
 subject
 keywords
 analysis, model, twophase flow, water, condensation
 in
 Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2007, vol 8, pts A and B  Heat Transfer, Fluid Flows and Thermal Systems
 pages
 349  354
 publisher
 American Society Of Mechanical Engineers (ASME)
 conference name
 ASME International Mechanical Engineering Congress and Exposition, 2007
 external identifiers

 wos:000254515300040
 scopus:44349111710
 language
 English
 LU publication?
 yes
 id
 e7aa5420c8ef4b11afc8d8f2210bdbf2 (old id 1407365)
 date added to LUP
 20090602 15:18:48
 date last changed
 20170101 07:55:50
@inproceedings{e7aa5420c8ef4b11afc8d8f2210bdbf2, abstract = {There are water vapour condensation and twophase flow in plate heat exchangers when they are used as condensers. Water phase change and flow dynamics modelling is an important but complicated task due to large change in water physical/transport properties across the water liquidvapour interface boundary. In particular, singularlink behaviour in governing equations is present due to the large step change in the density when computational fluid dynamics (CFD) is employed. 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 CFD approach is employed to model water vapour 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 thermalphysical properties, such as 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 concluded that, among others, the inlet vapour velocity has significant effects on the water phase change and twophase flow in the channel, in terms of liquidwater fraction factor distribution.}, author = {Wilhelmsson, Charlotte and Yuan, Jinliang and Sundén, Bengt}, booktitle = {Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2007, vol 8, pts A and B  Heat Transfer, Fluid Flows and Thermal Systems}, keyword = {analysis,model,twophase flow,water,condensation}, language = {eng}, pages = {349354}, publisher = {American Society Of Mechanical Engineers (ASME)}, title = {Water condensation and twophase flow modeling for a plate heat exchanger channel}, year = {2008}, }