How can I calculate Nusselt number by using this equation (Nu = ht.gradTx * nx + ht.gradTy * ny + ht.gradTz * nz) step by step in COMSOL?

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Muneer Ismael Popular answer

Dear Karrar,

I assume that you ask about the AVERAGE Nusselt number,

1- When the COMSOL run complete, go to the (Results) then, Derived Values. Right click on Derived values, then select the proper choice according to your problem, 2D or 3D.

2- Then, write (or paste) the your relation of Nusselt number in the "Expression", in the same time you must click on the wall you want to evaluate the Nusselt number.

3- Then click "Evaluate" to get the result in a table underneath.

The attached images can help you.

Muneer Ismael