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using convective cooling
Posted Feb 16, 2012, 5:36 p.m. EST 1 Reply
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I am solving heat transfer in solid for a 2D rectangular problem which has symmetry in one boundary and convective cooling in 3 other boundaries. I have chosen to solve it transient and would like to find temperature profile after 300s. The initial temperature is 2.8C and surronding temperature is 30C.
The problem is that when I decrease the heat trasnfer coefficient, temperature at each point increases and when "h" increases temperature of that specific point decreases.
I know it should be the other way aorund but I am not sure what the problem is. I appreciate your help
Mahshad
The problem is that when I decrease the heat trasnfer coefficient, temperature at each point increases and when "h" increases temperature of that specific point decreases.
I know it should be the other way aorund but I am not sure what the problem is. I appreciate your help
Mahshad
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1 Reply Last Post Feb 17, 2012, 4:46 a.m. EST
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Posted:
1 decade ago
Hi
first of all you are in 2D-Axi which means not a rectangle but a cylinder
if h increases the convecting cooling is increasing so the texchange should increase and T drop (if Tin > Tout) or the opposite for Tin < Tout (you have defined hotter souside so far)
Check the sign in the equations (COMSOL equation view turn on via preferences) between convective cooling and heat boundary I/F
--
Good luck
Ivar
first of all you are in 2D-Axi which means not a rectangle but a cylinder
if h increases the convecting cooling is increasing so the texchange should increase and T drop (if Tin > Tout) or the opposite for Tin < Tout (you have defined hotter souside so far)
Check the sign in the equations (COMSOL equation view turn on via preferences) between convective cooling and heat boundary I/F
--
Good luck
Ivar