[Nadaaaa22]

I’m working on a heat sink I applied a heat source at the bottom, the fluid was over the heat sink. The issue here how can I get the heat transfer coefficient?. I used a surface average heat transfer coefficient but I don’t know where I can apply it?. Can someone please help understand how the heat transfer coefficient is calculated?.

[ashokac7]

Originally Posted by Nadaaaa22

I’m working on a heat sink I applied a heat source at the bottom, the fluid was over the heat sink. The issue here how can I get the heat transfer coefficient?. I used a surface average heat transfer coefficient but I don’t know where I can apply it?. Can someone please help understand how the heat transfer coefficient is calculated?.

Little more information would be better. Also why do you want to calculate it?

We calculate heat transfer coefficients for surface and fluid flowing over/around it. So you will not get any values when you try to plot it on cut section. You can get the values on your walls in your region. You will not get any values on inlets and outlets.

Likewise we calculate HTC's on walls in CHT analysis. So that we can apply these values on solid. So it depends on your purpose to where you want to use it.
Hope this helps.

[Nadaaaa22]

It is similar to the attached file I added the fluid domain but I don’t know how I can calculate the heat transfer coefficient of the heat sink?. I took the surface average (boundary heat flux) then I used an expression to divide it over the temperature difference but I got a wrong answer. What Q should I take i’m Kinda lost.