CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent Multiphase

How to simulate the condensation in a heat exchanger?

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 3, 2021, 05:01
Question How to simulate the condensation in a heat exchanger?
  #1
New Member
 
Harris Fan
Join Date: Jun 2021
Posts: 1
Rep Power: 0
haisfa is on a distinguished road
Hi,

I have to simulate the change of moisture content of air passing through a fan coil. There is cold water running in a copper tube. The heat of air should be transmitted through aluminum fins and copper tube walls to the water. I successfully simulated the temperature change without considering the moisture content. Therefore the basic settings should be alright. The software version is 2021 R1 student license.

To simulate the change of relative humidity, the multiphase model (mixture) is applied. The related settings are as the following.

Phase:
phase-1: mixture-template (air and water-vapor)
phase-2: water-liquid

Mass transfer:
From phase-2
To phase-1 (h2o)
Mechanism: evaporation-condensation

Boundary conditions:
Inlet:
Air inlet -> phase-2 -> Multiphase: Volume fraction = 0
Water inlet -> phase-2 -> Multiphase: Volume fraction = 1
Outlet:
Air outlet -> phase-2 -> Multiphase: Volume fraction specification method = From neighboring cell
Water outlet -> phase-2 -> Multiphase: Backflow volume fraction = 1

Others are kept as default. After calculation, no condensation occurs even the relative humidity of the air around the tube surface is higher than 100%. I don't know what I missed. I need help.
haisfa is offline   Reply With Quote

Reply

Tags
condensation, heat exchanger, humidity, moist air, moisture transfer

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
a possible substitution of heat exchanger module in fluent?! Sadegh.A FLUENT 0 September 25, 2017 16:49
How to carry out 3D shell and Tube Heat Exchanger analysis in fluent medogalal FLUENT 3 December 30, 2015 05:28
Condensation and Evaporation modelling in Single Heat Exchanger Somnath rangrej Fluent Multiphase 1 August 14, 2015 06:53
Ansys Fluent analysis of heat exchanger MStudent FLUENT 2 April 20, 2015 09:40
transient source term strakakl OpenFOAM 38 November 19, 2013 02:18


All times are GMT -4. The time now is 09:08.