Analysis Of Water Condensation And
Two-phase Flow In A Channel Relevant For
Plate Heat Exchangers
Author(s)
J. Yuan, C. Wilhelmsson & B. Sundén
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 cannot 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 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 two-phase fields. The water phase change and twophase
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.
Keywords: water, condensation, two-phase flow, model, analysis.
Keywords
water, condensation, two-phase flow, model, analysis.
Related Book
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