nusselt number at no flow right or wrong
 

hi,
can i calculate a nusselt number at the back side of the plate where there is no flow happening but back side of the plate cooled down due to the jet impingement on the front side. . jet impingement condition air strikes a plate and heat transfer from plate to air. but what if i want to calculate the nusselt number at the back side of the plate, is it right or wrong,

I think you need to do another calculation and separate boundary conditions. And then find out the nusselt on the air side.