Heat transfer coefficient

Nadaaaa22 · July 23, 2019, 07:32

I’m working in a heat sink model. I’m trying to validate my results with an experiment results. I applied a heat source at the bottom of the heat sink and then i used the surface average to get the heat transfer coefficient at the surface of the heat sink. I got almost 350% which is not acceptable I don’t know why. My first question is do we consider the bottom of the heat sink ( where the heat source applied) when getting the heat transfer coefficient? Because I didn’t consider it I just considered the other sides.

me3840 · July 24, 2019, 23:07

Write down the equation for heat transfer coefficient and try to compute it using the face getting heat input on the heatsink. Is there anything missing that prevents you from calculating it?

Nadaaaa22 · July 25, 2019, 06:12

@me3840 I got the boundary heat flux of the heat sink (whole geometry) over the temperature difference is this way right to get the heat transfer coefficient?.

me3840 · July 28, 2019, 16:50

Yes, that would be correct.

July 23, 2019, 07:32	Heat transfer coefficient	#1
Nadaaaa22 Member Join Date: Nov 2018 Posts: 41 Rep Power: 7	I’m working in a heat sink model. I’m trying to validate my results with an experiment results. I applied a heat source at the bottom of the heat sink and then i used the surface average to get the heat transfer coefficient at the surface of the heat sink. I got almost 350% which is not acceptable I don’t know why. My first question is do we consider the bottom of the heat sink ( where the heat source applied) when getting the heat transfer coefficient? Because I didn’t consider it I just considered the other sides.

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July 24, 2019, 23:07		#2
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	Write down the equation for heat transfer coefficient and try to compute it using the face getting heat input on the heatsink. Is there anything missing that prevents you from calculating it?

July 25, 2019, 06:12		#3
Nadaaaa22 Member Join Date: Nov 2018 Posts: 41 Rep Power: 7	@me3840 I got the boundary heat flux of the heat sink (whole geometry) over the temperature difference is this way right to get the heat transfer coefficient?.

July 28, 2019, 16:50		#4
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	Yes, that would be correct.