Gravity Effects in Porous Media

Thota · May 27, 2015, 13:31

Hi Everyone,

I modeled two 3D tubes; one porous and one hollow tube in GAMBIT and I am trying to find out the total heat transfer rate in both the cases by using FLUENT. The flow inside the tube is free convection and both ends of the tubes are at two different (higher and lower) temperatures.

I could get the different values of total heat transfer rate in case of gas flow in hollow tube with orientation with respect to gravity. But in the case of porous media, the result remains same with different orientations of tube with respect to gravity.

What could be the reason for no change in total heat transfer rate in case of porous media?

Please help me in understanding this problem!

jpando · May 27, 2015, 14:04

Are you using isotropic porous media coefficients or does you flow have a specified direction?

It is also possible that the value for porosity is affecting the result. Heat transfer within a porous media using the porosity to calculate heat transfer to surrounding cells.

Thota · May 27, 2015, 14:16

I have calculated the viscous and inertial resistance coefficients of particular porous material and using the same values in all directions. Is that wrong?

If i don't select porous media and mention porosity value only will solve the problem?

Thota · May 27, 2015, 14:27

I mean mentioning porosity value and porous media coefficients..without mentioning it is porous zone?

May 27, 2015, 13:31	Gravity Effects in Porous Media	#1
Thota New Member Thota Join Date: Apr 2014 Posts: 6 Rep Power: 12	Hi Everyone, I modeled two 3D tubes; one porous and one hollow tube in GAMBIT and I am trying to find out the total heat transfer rate in both the cases by using FLUENT. The flow inside the tube is free convection and both ends of the tubes are at two different (higher and lower) temperatures. I could get the different values of total heat transfer rate in case of gas flow in hollow tube with orientation with respect to gravity. But in the case of porous media, the result remains same with different orientations of tube with respect to gravity. What could be the reason for no change in total heat transfer rate in case of porous media? Please help me in understanding this problem!

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May 27, 2015, 14:04		#2
jpando New Member Join Date: May 2012 Posts: 26 Rep Power: 13	Are you using isotropic porous media coefficients or does you flow have a specified direction? It is also possible that the value for porosity is affecting the result. Heat transfer within a porous media using the porosity to calculate heat transfer to surrounding cells.

May 27, 2015, 14:16		#3
Thota New Member Thota Join Date: Apr 2014 Posts: 6 Rep Power: 12	I have calculated the viscous and inertial resistance coefficients of particular porous material and using the same values in all directions. Is that wrong? If i don't select porous media and mention porosity value only will solve the problem?

May 27, 2015, 14:27		#4
Thota New Member Thota Join Date: Apr 2014 Posts: 6 Rep Power: 12	I mean mentioning porosity value and porous media coefficients..without mentioning it is porous zone?