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

Semi-batch process

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 18, 2000, 00:01
Default Semi-batch process
  #1
Jonac
Guest
 
Posts: n/a
CFX Users

A semi-batch system is of continuous input but no output. Say a gas liquid/solid system with weakly compressible flow specified to the gaseous fluid, then how to set up the no output of the system without upsetting the mass balance in CFX?

Any comment is welcome and much appreciated.

Jonac

  Reply With Quote

Old   October 18, 2000, 07:51
Default Re: Semi-batch process
  #2
Gert-Jan van der Gulik
Guest
 
Posts: n/a
I am not sure if you can solve such a problem without making simplifications or using some Fortran-tricks.

Therefore: What is of interest in your simulation i.e. what is the problem you want to solve? Are you interested in the flow of the liquid or feed mixing? Or are you interested in the flow of the gas? Or perhaps both?

Regards, Gert-Jan
  Reply With Quote

Old   October 22, 2000, 20:56
Default Re: Semi-batch process
  #3
Jonac
Guest
 
Posts: n/a
Gert-Jan

The problem will be focussed on inter-phase mass transfer between gas and liquid followed by chemical reaction in an agitated vessel.

Could you elaborate the possible simplification can be carried out, please?

Thanks
  Reply With Quote

Old   October 23, 2000, 04:22
Default Re: Semi-batch process
  #4
Gert-Jan van der Gulik
Guest
 
Posts: n/a
Jonac,

I guess you have a vertical vessel to which gas is fed at the bottom through some gas inlet. Then why do you want to leave out the gasoutlet (i.e. leaving out the degassing boundary in CFX 4.3). Is the obtained pressure increase really that important for the process under study?

Gert-Jan
  Reply With Quote

Old   November 8, 2000, 21:06
Default Re: Semi-batch process
  #5
Jonac
Guest
 
Posts: n/a
Gert-Jan

We have solved the problem for now by specifying inlet as pressure boundary condition and no outlet in the system physically. The reason for preserving the semi-batch feature is because the gradual accumulation of the gas pressure in the head space of a vessel directly influences the solubility of the gas reactant in the reaction mixture and hence the reaction rate.

Cheers
  Reply With Quote

Old   November 10, 2000, 05:23
Default Re: Semi-batch process
  #6
Gert-Jan van der Gulik
Guest
 
Posts: n/a
Jonac,

Such a problem is hard to simplify and this looks a good approach. Good luck.

Gert-Jan
  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
to run a replayfile in batch mode from UNIX froztbear ANSYS Meshing & Geometry 4 May 13, 2014 09:00
Flow, Volume and Pressure Reports in Fluent after batch process ravids FLUENT 0 June 10, 2009 12:56
Running Job in Batch mode (EFD) Nick Sessions FloEFD, FloWorks & FloTHERM 0 April 16, 2008 17:44
Prosurf in batch mode Dhruv Siemens 1 September 19, 2005 19:02
Semi batch reactor modeling Bhaskar Main CFD Forum 0 April 25, 2003 12:33


All times are GMT -4. The time now is 06:20.