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

Pulsed Particle Ejection

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 10, 2000, 07:52
Default Pulsed Particle Ejection
  #1
Ali Khan
Guest
 
Posts: n/a
Hi, I am trying to model a Pulsed Particle Ejection. I am a fairly new user of Fluent5.3 or any CFD software and have extremely limited knowledge about it. Therefore if any of you can kindley help achieve what I am trying to do.

I am trying to simulate particle ejection at extremly small pulse rate i.e. 1.0E-03 sec. The ejection area is at extreme temperature and pressure. The ejection is into ambient condition or open space of air at standard conditions.

* What I would like to know is, what model is best suited to my needs.

* Which solver would be best 1) coupled or 2) segregated and if so implicit or explicit function.

I would also like to see the affect of temperature distribution, not only on particles, but also on the tip and the surrounding walls of the ejector nozzle.

Because of the high temperature, is it feassible to assume that there would be radiative heat transfer envolved.

If any of you have done similar work or fairly familiar with the situation please help !!!!!!

Thank you for your time and effort

Ali
  Reply With Quote

Old   November 15, 2000, 04:12
Default Re: Pulsed Particle Ejection
  #2
alice
Guest
 
Posts: n/a
Thermal spraying is a fairly tricky problem to solve because of steep temperature gradient. But anyway, your problem should be solved in two times:

1) the continuous phase (i.e. your flame or plasma plume if thermal spraying as I guess). For that you should choose a standard k-epsilon model. For solver, take the segregated one with implicit formulation. Your case is solved as steady state. This is allowed if you assume that you have a Newtonian fluid and that the LTE are satisfied. Of course later when you will get more used to CFD you should check wether or not the standard k-E is accurate enough. If not you will have to try the RNG. Regarding radiation, I neglect them. Actually the flow is really highly convection dominated. First you can set a constant temperature for nozzle walls (they are cooled down).

2)Now you are ready to solve your discrete phase model! Define your injection first, to enable the inert-particle definition in the material properties panel.

Have fun, Alice

  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
Problems involved heat transfer inside a particle and its thermal degradation zhangr STAR-CCM+ 2 August 25, 2011 06:59
Blood Damage Modelling via Particle Tracking in a Centrifugal Heart Pump scatman CFX 5 May 5, 2011 07:23
Particle Tracking for ion Jun CFX 2 August 31, 2010 08:19
DPM UDF particle position using the macro P_POS(p)[i] dm2747 FLUENT 0 April 17, 2009 01:29
the separated particle temperature in cyclone mkuswadi FLUENT 0 December 17, 2003 09:25


All times are GMT -4. The time now is 15:48.