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August 25, 2021, 14:36 |
Honeycomb Porous medium
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#1 |
New Member
Ahmed Ibrahim Abdalla
Join Date: Aug 2021
Posts: 3
Rep Power: 4 |
Hello everyone
I'm working on a project to reduce the heat transfer in plate in a square pipe. i have to create a porous medium in this plate. my question is, how to define the honeycomb parameters in CFX ? |
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August 27, 2021, 05:21 |
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#2 |
New Member
Ahmed Ibrahim Abdalla
Join Date: Aug 2021
Posts: 3
Rep Power: 4 |
can anyone help me please
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August 27, 2021, 05:44 |
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#3 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,716
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Have you looked in the documentation and read what parameters CFX needs to define a porous region? I would have thought that was the obvious place to start.
If you have read the documentation - then what are you having troubles defining?
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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September 9, 2021, 21:01 |
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#4 |
New Member
Ahmed Ibrahim Abdalla
Join Date: Aug 2021
Posts: 3
Rep Power: 4 |
Hello Ghorrocks,
thank you for your Answer. I have red the documentation and what parameters CFX needs to define a porous region. I understood that a Honeycomb or Perforated plat are Anistropic Porous medium and they could have Directional Loss Coefficient. Ialso have red some letrature about Honeycomb/ Perforated plate and i saw in some of them the Kperm was 5.73 mm/s ( which i couldnt implement in CFX ) and some of them was 1E-5,-6, -9 , -10 ,,,,,m^2 which i could implement in CFX. I still dont understand how CFX understand that these numbers are for honeycomb or other thing. one honeycomb can have many deffirent values. how can i define it exactly to get the result i want. |
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September 11, 2021, 06:40 |
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#5 |
Senior Member
Stuart
Join Date: Jul 2009
Location: Portsmouth, England
Posts: 733
Rep Power: 25 |
Do you have the experimental data for the pressure drop () across the plate as a function of volumetric flow rate () or superficial velocity ()? This is the velocity associated with the volumetric flow rate and frontal area (), not the true velocity within the porous media and the area of the filter pathways.
For a subdomain you can input permeability in units of [m^2] and loss coefficient in units of [1/m], but the latter might not be significiant. Let us assume you have a plot of vs and curve fitted to give which is also . CFX-Solver Theory Gude explains the Darcy-Forchheimer equation. You can then determine your and from the curve fit, fluid properites ( and ) and filter thickness (): Use the directional streamwise multipler to ensure this is applied to the streamwise direction only. |
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