CFD Online Logo CFD Online URL
Home > Forums > CFX

Multiphase Mixing Tank

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

LinkBack Thread Tools Display Modes
Old   April 27, 2014, 22:07
Default Multiphase Mixing Tank
New Member
Join Date: Feb 2014
Posts: 1
Rep Power: 0
afonsoal is on a distinguished road

I am working in a project about the simulation of a mixing tank bioreactor. For now, I would like to work only with water and air, with the air phase initially above the water, in a batch tank, no inlet or outlet (see attach. 1). I have a doubt about how to define the initial air phase. In the present model, I created the vessel with two domains and defined the air volume fraction = 1 in the upper domain and air.vf = 0 in the water domain and connected them with interface. I used a Turbulence Homogeneous model: k-epsilon, defined air as dispersed fluid and water as continuous, surface tension with drag coefficient and the top boundary as opening relative pressure = 1 atm. I am having some strange results, such as a higher water velocity in the air phase (see attach. 2), even though the water vol. fraction is 0. Moreover, the water velocity around the impellers is quite lower than I should expect.

Any thoughts?
Thank you in advance.
Attached Images
File Type: jpg Bioreactor_2.jpg (94.9 KB, 35 views)
File Type: jpg Bioreactor_1.jpg (92.4 KB, 25 views)
afonsoal is offline   Reply With Quote


bioreactor, mixing, multiphase, tank

Thread Tools
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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
3D mixing tank using MRF/SRF cfd_confuse Main CFD Forum 1 September 13, 2016 02:43
Mixing tank impeller Onicon FLUENT 1 March 24, 2015 03:43
Tank Mixing Problem davidleinster CFD Freelancers 6 June 18, 2013 10:50
3D mixing tank using MRF/SRF cfd_confuse FLUENT 0 October 2, 2010 03:46
Mass conservation problem in mixing tank multiphase simulation rockewan FLUENT 0 April 6, 2010 12:34

All times are GMT -4. The time now is 14:24.