# Semi-batch process

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 October 17, 2000, 23:01 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

 October 18, 2000, 06:51 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

 October 22, 2000, 19:56 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

 October 23, 2000, 03:22 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

 November 8, 2000, 21:06 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

 November 10, 2000, 05:23 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

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post froztbear ANSYS Meshing & Geometry 4 May 13, 2014 08:00 ravids FLUENT 0 June 10, 2009 11:56 Nick Sessions FloEFD, FloWorks & FloTHERM 0 April 16, 2008 16:44 Dhruv CD-adapco 1 September 19, 2005 18:02 Bhaskar Main CFD Forum 0 April 25, 2003 11:33

All times are GMT -4. The time now is 16:30.

 Contact Us - CFD Online - Top