The heat transfer coefficient (or film coefficient) is the proportionality constant between the heat flux q and the temperature difference $ΔT$ as the thermodynamic driving force for the flow of heat. It is used in calculating the heat transfer, typically by convection.

Calculation of $h_{tr}$ is based on a paper from 2014 by Sujit Purushothaman by the use of the Fourier transformation to convert the two-dimensional problem into a simple one-dimensional problem.

Symbol
$h_{\mathrm{tr}}$
Unit
W/K.m2
Formulae
 $\frac{q}{DeltaT}$ general formula $\frac{\mathrm{Nu}_{\mathrm{L}} k_{\mathrm{gas}}}{L_{\mathrm{char}}}$ for horizontal plates
Related
$k_{\mathrm{gas}}$
$L_{\mathrm{char}}$
$\mathrm{Nu}_{\mathrm{L}}$
Used in
$d_{\mathrm{im}}$
$T_{\mathrm{surf}}$