# Heat transfer coefficient for porous domain

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 November 2, 2012, 11:18 Heat transfer coefficient for porous domain #1 New Member   Join Date: Sep 2012 Location: Europe Posts: 25 Rep Power: 6 Sponsored Links Hi dears, anyone can tell me how to calculate the heat transfer coefficient for a porous domain with a solid continous component (fiberglasses) and a fluid continous component (resin)? I know that this coefficient varies with the temperature, so I want to do an expression for it, but how to do it?. I read the help but I didn't find my case! P.S. I know the interfacial area density of the porous.

 November 2, 2012, 12:00 #2 Senior Member   Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 512 Rep Power: 14 Perhaps h=q/(Twall-Tref) You choose the Tref yourself.

November 2, 2012, 12:55
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 Originally Posted by singer1812 Perhaps h=q/(Twall-Tref) You choose the Tref yourself.
Hi singer1812, the problem is that my cylindrical porous domain is heated at the wall by an imposed thermal profile (given through an expression "Twall"), so I don't know "q" a priori.
Besides, also T of the resin varies along the profile of the part.

 November 2, 2012, 12:59 #4 Senior Member   Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 512 Rep Power: 14 areaAve(Wall Heat Flux)@your area or if you dont want area averaged h, then create a variable for h using Wall Heat Flux And what ever Tref you want.

November 2, 2012, 15:00
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 Originally Posted by singer1812 areaAve(Wall Heat Flux)@your area or if you dont want area averaged h, then create a variable for h using Wall Heat Flux And what ever Tref you want.
Hello, areaAve is a post-processor command, I need to have heat transfer coefficient in pre-processor, to insert it in the porous domain tab.
And this heat transfer coeffcient is between solid an fluid part inside the porous domain, so I don't have an area as boundary location between the two phases.

 November 2, 2012, 15:19 #6 Senior Member   Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 512 Rep Power: 14 Ahh, I misunderstood. I thought you wanted to pull out an h off of your solution. You are looking for an emperically based h. I am not totally familar with fluid-solid h correlations for porous medium, and they will be quite specific to certain applications.

November 3, 2012, 11:14
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 Originally Posted by singer1812 Ahh, I misunderstood. I thought you wanted to pull out an h off of your solution. You are looking for an emperically based h. I am not totally familar with fluid-solid h correlations for porous medium, and they will be quite specific to certain applications.
thanks anyway singer1812

 June 20, 2014, 03:05 #8 Senior Member     hamed Join Date: Apr 2009 Posts: 148 Rep Power: 10 hi i.te did you find any answer for your problem? i think i have same trouble with variable h.any clue would really help

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