Heat transfer coefficient calculation h

FastFlow · September 27, 2016, 09:13

Hello guys,

Please, anyone can tell me how cfx calculate the convective heat transfer coefficient h(W/m2-K) in the case of adiabatic wall cooling by air ? In the tutorial they said that it can be calculated by this equation h=q/(T0-Tw), T0= flow temperature , Tw = Wall temperature. so how cfx can calculate q ?

Thank you.

evcelica · September 27, 2016, 15:48

Info on this is in the FAQ.
http://www.cfd-online.com/Wiki/Ansys...ficient_in_CFX

But for an adiabatic wall, the equation becomes 0/0, so there should be no heat transfer coefficient?

FastFlow · September 28, 2016, 04:22

Quote:

Originally Posted by evcelica

Info on this is in the FAQ.
http://www.cfd-online.com/Wiki/Ansys...ficient_in_CFX

But for an adiabatic wall, the equation becomes 0/0, so there should be no heat transfer coefficient?

Thank you Evcelica for your answer, but i wanna know which equation cfx use to calculate q (heat flux) if h=q(To-Tw) ?

evcelica · September 28, 2016, 16:56

Sorry, but I don't know what you mean.
Wall Heat Flux would be (heat flow normal to wall) / (cell area)
For adiabatic it should be 0 / area = 0.

September 27, 2016, 09:13	Heat transfer coefficient calculation h	#1
FastFlow New Member Join Date: Sep 2016 Posts: 5 Rep Power: 11	Hello guys, Please, anyone can tell me how cfx calculate the convective heat transfer coefficient h(W/m2-K) in the case of adiabatic wall cooling by air ? In the tutorial they said that it can be calculated by this equation h=q/(T0-Tw), T0= flow temperature , Tw = Wall temperature. so how cfx can calculate q ? Thank you.

September 27, 2016, 15:48		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,196 Rep Power: 24	Info on this is in the FAQ. http://www.cfd-online.com/Wiki/Ansys...ficient_in_CFX But for an adiabatic wall, the equation becomes 0/0, so there should be no heat transfer coefficient? monkey1 likes this.

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September 28, 2016, 16:56		#4
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,196 Rep Power: 24	Sorry, but I don't know what you mean. Wall Heat Flux would be (heat flow normal to wall) / (cell area) For adiabatic it should be 0 / area = 0.