Graetz number is given by

Name: Graetz number is given by
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The Graetz number is given by $Gz = \frac{mC_p}{kL}$, where $m$ is the mass flow rate, $C_p$ is the specific heat at constant pressure, $k$ is the thermal conductivity, and $L$ is the characteristic length. This dimensionless number is used in heat transfer to characterize the relation between convective and conductive heat transfer.

Graetz Number Is Given by