Define the following dimensionless numbers

 a) Nusselt number
 b) Peclet number
 c) Prandtl number
 d) Rayleigh number
 e) Reynolds number

a) Nusselt number (Nu): It is a dimensionless number that measures the ratio of convective to conductive heat transfer across a boundary. It is named after Wilhelm Nusselt and is expressed as Nu = (h × L) / k, where h is the convective heat transfer coefficient, L is a characteristic length, and k is the thermal conductivity of the fluid.

b) Peclet number (Pe): It is a dimensionless number relevant _______ _______ ________ ____ _________ __________ ___ ____ ______ ___.
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