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

How to choose the mean diameter value for dispersed fluid?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 30, 2011, 02:27
Default How to choose the mean diameter value for dispersed fluid?
  #1
New Member
 
creddy
Join Date: Aug 2010
Location: Kanpur/UP/India
Posts: 25
Rep Power: 16
creddy_trddc is on a distinguished road
Hi everyone,

I am simulating two-phase flow consisting of one continuous phase and one dispersed fluid phase (Here Argon gas is injected into a vessel consisting of molten steel from nozzle located at bottom).

Here I am considering Argon gas as dispersed fluid and molten steel as continuous phase.

In CFX-Pre under Fluid details tab it was asking for mean diameter of dispersed fluid (Argon gas),

Can any one please tell me how to choose the value of mean diameter of dispersed fluid.


In CFX manual it has mentioned "Mean Diameter
For a Dispersed Solid or Dispersed Fluid, you must supply the mean
diameter of the dispersed particles, droplets or bubbles constituting the
phase. The mean diameter is the actual diameter for spherical
particles. For non-spherical particles, you should provide the Sauter
mean diameter, that is, the diameter of a sphere possessing the same
volume as the particles."

But I am not getting how to choose the right value for mean diameter.



FLUID: Argon gas
FLUID MODELS:
FLUID BUOYANCY MODEL:
Option = Density Difference
END
MORPHOLOGY:
Mean Diameter = 0.68 [m]
Option = Dispersed Fluid

END
TURBULENCE MODEL:
Option = Dispersed Phase Zero Equation
END
END
END
FLUID: Molten Steel
FLUID MODELS:
FLUID BUOYANCY MODEL:
Option = Density Difference
END
MORPHOLOGY:
Option = Continuous Fluid

END


Looking forward for reply.


Thanks & Regards,
Niranjan Reddy.
creddy_trddc is offline   Reply With Quote

Old   October 30, 2011, 04:30
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,826
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
The bubble diameter is a function of the flow conditions and therefore you must specify it. Hopefully you know it from experimental results. If not, you can estimate it from the argon nozzle diameter and look in the literature for gas bubble size from a nozzle.
ghorrocks 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
Water subcooled boiling Attesz CFX 7 January 5, 2013 03:32
Locating and observing a transient fluid phenomena Chander CFX 2 September 25, 2011 18:49
Mean diameter of dispersed fluid in case of two-phase flow creddy_trddc CFX 0 September 19, 2011 09:17
Fluid pairs fjalil Main CFD Forum 0 June 10, 2009 13:47
Concentric tube heat exchanger (Air-Water) Young CFX 5 October 6, 2008 23:17


All times are GMT -4. The time now is 07:57.