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

Help with slug flow simulation.

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 21, 2008, 22:09
Default Help with slug flow simulation.
  #1
Kes
Guest
 
Posts: n/a
Dear all, i was previously trying to model droplet formation with a slug flow pattern in a T-junction and it was working fine. When i increase the flow rate of the oil phase (i'm creating water in oil emulsion), the droplets decrease in size which is expected. However the droplets are sticking to the walls and are not located at the centre of the tube even when it is smaller than the diameter of the tube. Thus i think this is due to me turning on the Wall Adhesion option under Define->Phases->Interaction. I turned it off and now i couldn't get back the flow pattern that i wanted. The solutions take very long to converge when i am using the time step recommended by the Fluent system, around 30-40 iterations per time step and the flow pattern that results is somewhat like the slug flow disintegrating into small bubbles. Reversed flow is also observed during iterations. Therefore i would like to ask if anybody could guide me the right way?
  Reply With Quote

Old   May 26, 2008, 13:58
Default Re: Help with slug flow simulation.
  #2
Renato Pacheco
Guest
 
Posts: n/a
are you following any flow pattern map?? because normally when you change the flow rate or the velocities, probably you will get another flow pattern. so you should follow this maps to see witch pattern you should get. I suggest the baker chart, as long as he has some corrections for fluids different from air or water, and as i see you are using oil.

  Reply With Quote

Old   May 27, 2008, 04:48
Default Re: Help with slug flow simulation.
  #3
Kes
Guest
 
Posts: n/a
Ok but i have checked the baker chart and the result i'm trying to get is something between plug flow and slug flow. However in the Fluent documentation help it has classified all of these into slug flow, therefore i used the VOF model.

Recently i tried the simulation again without Wall Adhesion and with a smaller time step, resulting in a more coherent result. However this one has the droplet formed clinging onto the wall and with a tail that extends from it all the way to the water phase inlet, which is not what i wanted.

Please advice.
  Reply With Quote

Old   November 9, 2019, 21:39
Default
  #4
New Member
 
sam
Join Date: Dec 2018
Posts: 13
Rep Power: 4
camad93 is on a distinguished road
Quote:
Originally Posted by Kes
;151081
Ok but i have checked the baker chart and the result i'm trying to get is something between plug flow and slug flow. However in the Fluent documentation help it has classified all of these into slug flow, therefore i used the VOF model.

Recently i tried the simulation again without Wall Adhesion and with a smaller time step, resulting in a more coherent result. However this one has the droplet formed clinging onto the wall and with a tail that extends from it all the way to the water phase inlet, which is not what i wanted.

Please advice.
Do you include the wall contact angle? Have you published any paper and if yes, could you send me the link of your paper please. Thanks in advanced!
camad93 is offline   Reply With Quote

Reply

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
slug flow with LES Renato Pacheco FLUENT 0 June 26, 2008 13:09
slug flow again shu ming FLUENT 1 February 25, 2006 12:33
IC and BC for slug flow Paul_C FLUENT 0 December 26, 2005 09:49
Slug Flow Paul_C FLUENT 0 December 13, 2005 23:17
IC & BC for slug flow simulation Pei-Ying Hsieh Main CFD Forum 7 July 31, 2000 22:27


All times are GMT -4. The time now is 06:45.