CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Bubble Diameter

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

LinkBack Thread Tools Display Modes
Old   May 22, 2003, 01:26
Default Bubble Diameter
Posts: n/a
Hi all, I try to simulate gas - liquid mixing in agitated tank. I'd like to compute the change of bubble diameters because of bubble coalescence and bubble break-up. I use multiphase model --> mixture model . For computing bubble diameter I use UDF. First, I define conservation equation for 'n' (bubble number/unit volume) as UDS. Because it is a multiphase model so I must define the flux term in UDS using DEFINE_UDS_FLUX, and the diffusivity term (dispersion coefficient) using DEFINE_DIFFUSIVITY. Finally I define bubble diameter using DEFINE_PROPERTY. All of these UDF access second phase domain, so I use phase_domain_index, or DOMAIN_ID, or thread_sub_thread. I have compiled my program, and FLUENT can read, so it is right according to FLUENT's syntax. But when I try to iterate, it was error. So what do you think? Do you have any idea?? Please help me. Thank you
  Reply With Quote

Old   May 26, 2003, 10:45
Default Re: Bubble Diameter
Shiping Liu
Posts: n/a
I am working on a project of liquid-liquid dispersive mixing, in which drops break up and coalesce. I also want to use Fluent simulate the drop size distribution, but its solver does not allow drop size change.

From your message, you want to combine breakup and coalescence models with flows. It is very good idea. It is, however, very tough to do. So far I have not found a case in publications. Most people suppose there is no interaction between two phases when they use breakup and coalescence models. Of course, those people have no capability of putting them together.

If you have any progress, please let me know. Good luck.
  Reply With Quote

Old   May 28, 2003, 22:02
Default Re: Bubble Diameter
Posts: n/a
I'm working with gas-liquid mixing in a stirred tank. So I want to compute gas bubble's diameters. Your research is liquid-liquid flow, isn't it? If you want to compute the droplet size you can use Discrete Phase Modelling --> you can model droplet size/diameter, because there is a facility to model it in DPM. Good luck!
  Reply With Quote

Old   March 4, 2010, 11:56
New Member
Join Date: Nov 2009
Posts: 1
Rep Power: 0
minnikanti is on a distinguished road
hi santi im working on two phase gas liquid bubble flow and i have to account for bubble breakup and coalescence just like you can you elaborate a bit about your approach
minnikanti is offline   Reply With Quote


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
bubble diameter definition in multi phase flow boiling simulation FLUENT Abishek FLUENT 11 February 3, 2016 08:41
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
bubble diameter distribution emrahdeniz FLUENT 0 September 27, 2010 07:03
UDF for bubble diameter in two phases, help!! edgar h FLUENT 0 June 19, 2008 20:37
Bubble diameter in Gas-solid Fluidized Bed Wee FLUENT 0 April 27, 2008 23:04

All times are GMT -4. The time now is 05:25.