[Arttis]

Hello!

My simulation involves a turbulent water flow in an inclined rectangular cavity:

inlet velocity = 0.003 m/s
Pressure outlet = Patm
Top plate heat flux imposed (different for every simulation, q= 100-1000 W/m2)
Bottom plate and side walls adiabatic, q=0 W/m2

Water is flowing between the plates in a cavity.

When I take an Area Weighted Average value for convective heat transfer coefficient (htc) between the Top surface and the water, I get the same value despite the heat flux applied.

I think htc should change when I change heat flux value, because the temperature varies along the Top surface.

However, in my case, for the constant velocity (and hence the mass flow rate) the heat transfer coefficient remains the same.

Could anyone see what is wrong here? Any help is appreciated.