CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Mixing By Natural Convection Processes

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

LinkBack Thread Tools Display Modes
Old   February 12, 2003, 19:40
Default Mixing By Natural Convection Processes
Greg Perkins
Posts: n/a

I'm looking at a process involving surface reactions (combustion/gasification) on walls in large reactors. The mixing and fluid flow in the reactor may be governed by natural convection which is most likely time-periodic.

Unfortunately, I don't think I can simulate the transient behaviour due to computational limitations - its 3D, >10m size^3 and I have a minimum of 7 species and the residence time in the reactor is large.

In order to approximate this situation I've been looking at using a steady state model, and modifying diffusion parameters to "appproximate" the mixing effect of the natural convection.

Has anybody tried this? How did you go about it? Was it successful etc???

I imagine that in the limit of very high diffusion I'll get a CSTR type model from the CFD, while with the standard steady model I'll get a lot less mixing. Probably the natural convection mixing and mass transport - if I could simulate it - would lie between these two extremes. So I thought I'd look at the extremes and see what I get.

Anybody got any ideas, suggestions or inisghts which might be helpful?

Anything appreciated

  Reply With Quote


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
natural convection problem with radiation jorien CFX 0 October 14, 2011 09:26
Coupled vs Seg - Natural vs. Forced Convection Alex Siemens 5 December 12, 2007 05:58
Approximate Mixing due to Natural Convection Greg Perkins Main CFD Forum 0 February 12, 2003 19:43
Heat of mixing - natural convection Andre Main CFD Forum 0 May 10, 2000 05:42
Heat of mixing - natural convection Andre FLUENT 0 May 10, 2000 05:40

All times are GMT -4. The time now is 16:52.