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

mixing determination

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 31, 2000, 03:29
Default mixing determination
  #1
M. A. Rakib
Guest
 
Posts: n/a
I am using FLUENT 5 for mixing simulation. I want to quantify mixing by injecting pulse tracer and then track the transient spread of these tracers. I want the concentration of these tracers at different locations in a flow domain. Can you please comment on how I can achieve this. I dont want to see the pathlines only., but to define an injection, with a known number of particles and then find out the tracer concentration concentration at different positions. I would be very grateful
  Reply With Quote

Old   June 1, 2000, 14:26
Default Re: mixing determination
  #2
fouzy
Guest
 
Posts: n/a
dear;

May be you can use discrete phase modeling like in combustion of coal. you can look in tutorial 2 of fluent 5 how to use a discrete phase model like in coal combustion. You can always use PDF method in this case if you have turbulent incompressible flow

best regards
  Reply With Quote

Old   June 1, 2000, 21:17
Default Re: mixing determination
  #3
John C. Chien
Guest
 
Posts: n/a
(1). You can try to use the temperature field to track the effect of mixing. (2). The energy equation is always available, and it has both the convection and diffusion effect. (3). It is hard to make the particle to show the effect of diffusion. The graphical particle path follows only the velocity field, so, no diffusion is included. (4). So, I think, it is much easier to track the temperature field to see the degree of mixing.
  Reply With Quote

Old   June 3, 2000, 03:40
Default Re: mixing determination,thanks fouzy
  #4
M. A. Rakib
Guest
 
Posts: n/a
Thank you. Can you suggest how I can define the tracer injection as follows: -- ~100 tracers injected at the inlet. -- 50% of these tracers, i.e. 50 tracers are colored black. -- Rest 50%, i.e. 50 tracers are differently colored, viz. gray.

Thanks.
  Reply With Quote

Old   June 3, 2000, 03:48
Default Re: mixing determination, thanks John
  #5
M. A. Rakib
Guest
 
Posts: n/a
Thanx. I used this method of mixing determination for two different streams being mixed. But I am exploring the case when the same fluid is being taken out and circulated back. For this case I have to take help of tracers. Now I want to use color coding. Can you please suggest how I can define the injection color. e.g. I want 50% of the tracers black, and 50% gray.
  Reply With Quote

Old   June 3, 2000, 10:22
Default Re: mixing determination,thanks fouzy
  #6
fouzy
Guest
 
Posts: n/a
dear;

May be you can use model with species but you will don't turn on the reactions models. so you will create two species in the panel of material that they have differents properties,and in the boundaries inlet you specifie the mass fraction for the two species, so you can track them after. or you can use dispersed model with two types of particules that des have differents shapes or density.

best regards
  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
Problem with Mixing plane Mitpostdoc FLUENT 0 July 26, 2011 14:31
Meshing a Mixing Plane using ICEM Will Anderson FLUENT 0 November 6, 2010 18:08
Mixing plane geometry definition Hbet FLUENT 0 January 18, 2002 08:16
Mixing Determination J.Spence FLUENT 1 March 31, 2000 18:08
Mixing determination Spence FLUENT 1 March 23, 2000 21:51


All times are GMT -4. The time now is 22:19.