What is the Nusselt Number?


What is the Nusselt Number?
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  • The Nusselt number represents the ratio of the heat transfer due to convection to the heat transfer due to conduction that would occur in a motionless fluid:

    Nu = hL/k

    where

    h is the convective heat transfer coefficient

    L is the characteristic length

    k is the thermal conductivity

    The Nusselt number can be also seen as non-dimensional temperature gradient at a surface.

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