What is the difference between "Conductive heat flux" and "Normal total heat flux" in COMSOL?

Seyed Mohsen Hashem Zadeh @Seyed_Mohsen_Zadeh

08 August 2018 0 3K Report

I need to evaluate the Nusselt number on a hot plate in a square cavity. As the equations are non-dimensional, the Nu can be easily calculated as:

Nu=-dT/dx

Surprisingly, boundary and domain flux expressions in the COMSOL provide different values:

Manual calculation: Tx=5.7383

Normal conductive heat flux: 5.9577

Conductive heat flux, x component: 5.7383

Can anyone help me to find out what is the difference between these expressions?

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