Radiation and Convective heat loss Boundary conditions on a (ONE) wall

Struggle_Achieve · February 29, 2016, 03:23

Hello foamers!
Greetings

I am quite new to OF. Trying to learn it from last 2 months, I know that convective heat flux boundary condition (BC) can be implemented using externalWallHeatFluxTemperature BC but in my problem there is heat loss due to radiation also.
I would be very grateful if anyone can help me out about the BC which will incorporate both convective and radiative heat losses from a same wall.

Regards,
Prateek.

Struggle_Achieve · March 7, 2016, 00:01

Hello Again,

I would be highly obliged to get a reply on this as my work is struck because of it.

Is this even possible to have both convective and radiative BC on a same wall?

Any help will be greatly appreciated.

Thanks and Regards,

Singh.

Struggle_Achieve · March 8, 2016, 02:52

Hey Hello Once Again,

Feels funny to talk to myself

But I have decided to use the GROOVY BC for this Case..

"type groovyBC;
variables "h=XYZ;k=XYZ';sigma=5.6e-7;E=XYZ";Tinf=XYZ"';";
gradientExpression "h/k*(T-Tinf)+(sigma/k)*E*(T-Tinf)*(T-Tinf)*(T-Tinf)*(T-Tinf)";
fractionExpression "0";
"
USE SMALL TIME STEPS!

Regards,

Singh.

February 29, 2016, 03:23	Radiation and Convective heat loss Boundary conditions on a (ONE) wall	#1
Struggle_Achieve Member Sing Join Date: Jan 2016 Posts: 30 Rep Power: 10	Hello foamers! Greetings I am quite new to OF. Trying to learn it from last 2 months, I know that convective heat flux boundary condition (BC) can be implemented using externalWallHeatFluxTemperature BC but in my problem there is heat loss due to radiation also. I would be very grateful if anyone can help me out about the BC which will incorporate both convective and radiative heat losses from a same wall. Regards, Prateek. Last edited by Struggle_Achieve; March 1, 2016 at 01:52.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Divergence in AMG solver!	marina	FLUENT	20	August 1, 2020 11:30
Natural convection in a closed domain STILL NEEDING help!	Yr0gErG	FLUENT	4	December 2, 2019 00:04
mixed boundary conditions including heat flux, convective heat transfer and radiation	lotus_blue	FLUENT	0	April 3, 2013 18:55
Cavity air flow with radiation – result variable	Yingchun	CFX	1	November 25, 2005 11:13
Convective Heat Transfer - Heat Exchanger	Mark	CFX	6	November 15, 2004 15:55

March 7, 2016, 00:01		#2
Struggle_Achieve Member Sing Join Date: Jan 2016 Posts: 30 Rep Power: 10	Hello Again, I would be highly obliged to get a reply on this as my work is struck because of it. Is this even possible to have both convective and radiative BC on a same wall? Any help will be greatly appreciated. Thanks and Regards, Singh.

March 8, 2016, 02:52		#3
Struggle_Achieve Member Sing Join Date: Jan 2016 Posts: 30 Rep Power: 10	Hey Hello Once Again, Feels funny to talk to myself But I have decided to use the GROOVY BC for this Case.. "type groovyBC; variables "h=XYZ;k=XYZ';sigma=5.6e-7;E=XYZ";Tinf=XYZ"';"; gradientExpression "h/k(T-Tinf)+(sigma/k)E(T-Tinf)(T-Tinf)(T-Tinf)(T-Tinf)"; fractionExpression "0"; " USE SMALL TIME STEPS! Regards, Singh.