CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Running, Solving & CFD

Brainstorming on bubbledrop sizes

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

LinkBack Thread Tools Display Modes
Old   January 24, 2009, 14:03
Default Hello! I'm doing some simul
Senior Member
sega's Avatar
Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 11
sega is on a distinguished road

I'm doing some simulations with water-drops in air using interFoam.

If I decrease the drop size, what is physically happening?

I'm not sure how to describe this in terms of dimensionless number (if there are any).

Is there a dimensionless number how describes the ratio of any kind of force related to surface forces, who includes a length scale?
(Except the Grasshof-number, as buoyancy is negligible.)

Have a nice day.
Schrödingers wife: "What did you do to the cat? It's half dead!"
sega is offline   Reply With Quote

Old   January 28, 2009, 16:38
Default Grab the book bubbles, drops,
Posts: n/a
Grab the book bubbles, drops, and particles by Clift, Grace, and Weber.

The non-dimensionless numbers are: Reynolds, Eotovos, Morton, density, and viscosity ratio.

If you decrease the volume of the bubble, The Eotovos and the Reynolds number will decrease.

Put another way, your intertial and buoyant forces will reduce, whereas your surface tension and viscous forces remain the same.

Morton and Eotovos include surface tension.

Hope this helps...
  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
The spectrum of eddy sizes Li Main CFD Forum 3 December 24, 2008 04:44
Optimal cell sizes anita OpenFOAM Meshing Format & General Technical 2 March 28, 2008 12:13
double mesh sizes in Fluent Emily FLUENT 1 January 6, 2005 05:17
optimum grid sizes yeo FLUENT 4 December 11, 2002 17:56
Any resources for grid-sizes out there? Jeff Waters Main CFD Forum 1 March 30, 1999 12:40

All times are GMT -4. The time now is 16:42.