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Water condensation and two-phase flow modeling for a plate heat exchanger channel

Wilhelmsson, Charlotte LU ; Yuan, Jinliang LU and Sundén, Bengt LU (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.349-354
Abstract
There are water vapour condensation and two-phase 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 liquid-vapour interface boundary. In particular, singular-link 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 high-resolution 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 two-phase 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 liquid-vapour interface boundary. In particular, singular-link 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 high-resolution calculations and detailed analysis are required. In this study, a CFD approach is employed to model water vapour 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 thermal-physical properties, such as 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 concluded that, among others, the inlet vapour 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
keywords
analysis, model, two-phase 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
e7aa5420-c8ef-4b11-afc8-d8f2210bdbf2 (old id 1407365)
date added to LUP
2009-06-02 15:18:48
date last changed
2016-10-13 04:37:44
@misc{e7aa5420-c8ef-4b11-afc8-d8f2210bdbf2,
  abstract     = {There are water vapour condensation and two-phase 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 liquid-vapour interface boundary. In particular, singular-link 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 high-resolution calculations and detailed analysis are required. In this study, a CFD approach is employed to model water vapour 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 thermal-physical properties, such as 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 concluded that, among others, the inlet vapour 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       = {Wilhelmsson, Charlotte and Yuan, Jinliang and Sundén, Bengt},
  keyword      = {analysis,model,two-phase flow,water,condensation},
  language     = {eng},
  pages        = {349--354},
  publisher    = {ARRAY(0x9bd6918)},
  series       = {Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2007, vol 8, pts A and B - Heat Transfer, Fluid Flows and Thermal Systems},
  title        = {Water condensation and two-phase flow modeling for a plate heat exchanger channel},
  year         = {2008},
}