[Nadaaaa22]

Hey

I'm working on a heat sink with applied heat source at the bottom, I want to ask how I can get the heat transfer coefficient?. The more I read about computing heat transfer coefficient in ANSYS the more I get lost. what is the reference temperature and why it can make the results wrong?. I'm using a turbulent model. I have also another question I read that most of the replies about getting heat transfer coefficient suggested writing an expression using the bulk temperature. what is the bulk temperature and why I'm using the bulk temperature not the surface temperature in getting heat transfer coefficient?. I got lost please help me with this