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

Condensation Microchannel VOF

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 6, 2019, 07:27
Post Condensation Microchannel VOF
  #1
New Member
 
Nicola Benvenuti
Join Date: Dec 2019
Location: Italy
Posts: 1
Rep Power: 0
Nik_Benve is on a distinguished road
Hello,
currently i'm working on a multiphase cfd simulation on Ansys Fluent.
I'm trying to simulate the condensation process of r134a (refrigerant) in a veretical microchannel 3.4mm wide and 300mm. The vapour enters at saturation conditions and volume fraction 1. The free stream velocity is 1.99 m/s (G=100 kg/s; density=50.085 kg/m^3).
I'm working in a 2D axysimmetric geometry. The grid is a structured mesh with 510000 and y+ =1.
I chose the k-w SST model with low reynolds correction and implicit formulation for VOF, as i'm trying to obtain a stationary result.
Moreover i wrote a UDF to implement the Lee Model for condensation, defining the Mass Transfer properties.

Right now I'm really struggling to obtain a good convergence of the continuity equation. Indeed the mass flow rate difference between inlet and outlet increases at first and the start to fluctuate.
Any Suggestion?

Thanks for your attention!
Nik_Benve is offline   Reply With Quote

Old   April 5, 2022, 06:05
Default
  #2
New Member
 
Neel
Join Date: Nov 2018
Posts: 12
Rep Power: 8
neelcfd is on a distinguished road
What coefficients are you using for Lee's Model? This coefficients have strong impact on mass balance.
neelcfd is offline   Reply With Quote

Reply

Tags
condensation, continuity equation, microchannel, vof multiphase


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
Condensation VOF artem929292 FLUENT 1 May 21, 2017 14:22
Evaporation and condensation model in VOF ic3lemon Fluent Multiphase 0 December 12, 2015 07:56
vof condensation vivekanand Fluent Multiphase 3 April 14, 2015 12:35
VOF based condensation in microchannel. vivekanand FLUENT 0 April 8, 2015 06:40
VOF - NO Condensation !!!!. JSM FLUENT 2 May 12, 2012 10:08


All times are GMT -4. The time now is 14:13.