CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

Bubble motion in water...help

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 29, 2001, 00:25
Default Bubble motion in water...help
  #1
Jazaul Ikhsan
Guest
 
Posts: n/a
Hello,

I am doing research about bubble flow in water. The bubble motion causes disturbance in water. What is the governing equation of this case ? How do I apply the shear stress term ? Thank you for your answer
  Reply With Quote

Old   May 29, 2001, 00:57
Default Re: Bubble motion in water...help
  #2
Ibrahim Mustafa
Guest
 
Posts: n/a
The governing equations are NS. Apply them separately to water and air bubbles and match the boundary conditons to converge
  Reply With Quote

Old   May 29, 2001, 02:43
Default Re: Bubble motion in water...help
  #3
Jazaul Ikhsan
Guest
 
Posts: n/a
Your explanation too general for me because, I'm sorry, I'am a beginner in this case. Could you explain in detail, please ? Thanks again for your answer.
  Reply With Quote

Old   May 29, 2001, 06:05
Default Re: Bubble motion in water...help
  #4
John C. Chien
Guest
 
Posts: n/a
(1). You have governing equations for the bubble, and governing equations for the water. (2). So, you have conservation laws for the water, the bubble, and the combined system. Conservation laws are mass, momentum and energy conservations.(3). Relatively speaking, you will have flow over the bubble, and it will create flow motions in water. (you will also get flow motion in the bubble.)
  Reply With Quote

Old   May 29, 2001, 09:55
Default Re: Bubble motion in water...help
  #5
Pei-Ying Hsieh
Guest
 
Posts: n/a
Navier-Stokes' equation is the governing equations. When in the water phase, use the fluid properties of water (density, viscosity), while in the air phase, use the properties of air. The conditions on the water/air interface should match. So, one of the issues is to track the locations of the interfaces. Several methods have been developed for this: Level Set, VOF (volume-of-fluid), Front tracking...etc. Each has its weakness and strength. So, which one to use depends on the problem you are solving.

If the medium of the bubble is not air and the density ratio between the bubble and water (or surrounding fluid) is less than 200, you might want to consider Lattice Boltzmann method. There is no need to track the interface explicitly.
  Reply With Quote

Old   May 29, 2001, 11:37
Default Re: Bubble motion in water...help
  #6
bronze
Guest
 
Posts: n/a
There is a book by cliff, grace and weber

Bubbles drops and particles

Commonly refered to as the "Bubble Bible". I would suggest you start here. It covers everything and more.

A very interesting subject
  Reply With Quote

Old   May 30, 2001, 02:48
Default Bubble bible
  #7
Barry
Guest
 
Posts: n/a
Hey Bronze

Please give us the full reference for the Bubble bible, We are very interested! i.e. authors publishers etc etc

Thanx Barry
  Reply With Quote

Old   May 30, 2001, 10:26
Default Re: Bubble bible
  #8
bronze
Guest
 
Posts: n/a
R. Clift, J. R. Grace, and M.E. Weber, 1978, Bubbles, Drops, and Particles, Academic Press, NY, ISBN 0-12-176950-X
  Reply With Quote

Old   May 31, 2001, 01:35
Default Re: Bubble bible
  #9
Barry
Guest
 
Posts: n/a
Thanx a million Bronze
  Reply With Quote

Reply

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
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Hot gas bubble collapse in cool water William Palm FLUENT 1 April 20, 2005 10:53
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11
uptodate water distribution network fredius,magige,tanzanian,(e.a) Main CFD Forum 0 January 27, 2002 08:10


All times are GMT -4. The time now is 04:41.