thermal boundary option
 

hello everyone~
I have a problem about ...heat transfer coefficients that is from
model setup/boundaries/mesh boundaries/mesh block/wall/thermal information/thermal boundary options

there are heat transfer coefficient to fluid 1 &to fluid 2 ,does anybody know that means?
thanks

if the mesh boundary is of type 'wall' with a specified temperature, then it needs an htc between the wall and adjacent fluid to compute the heat flux at the boundary. The user can defined a different htc for fluid 1 and 2 in two-fluid problems.

does it make sense?

Michael
i thought the heat transfer coefficient is calculated by the solver while solving the conjugate heat transfer problem? pls help to clarify.

Yes, the solver will do it if you leave these input entries blank.

but if I set the 'wall' as copper that have thermal conductivity value(k),does it needs a htc ?

It does not really matter what material it is made of. The user can either define a constant htc at the fluid/wall interface, or the code will compute it automatically as a function of the materials properties and the flow. In the latter case, it assumes that the contact between copper and fluid is perfect, i.e., no thermal resistance.