Feser's New Lineup

[meanmoe]

As long as the temperature/heat flux doesn't vary within the cross-sectional area of your fin/rod/whatever then you don't need to make the math complicated.

...

no slip

Do you know what the theory is for the handy equations? Is it Couette flow? or Poiseulle? They both assume a no slip condition for velocity as an approximation and make the other assumptions plus some more like laminar flow...