Nusselt number
= Nusselt number
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{title2=$\mathrm{Nu}$}
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The <Nusselt number> is the ratio of total <heat transfer> to conductive <heat transfer> across the same length scale: $\mathrm{Nu}=qh/(k_T\Delta T)$, where $q$ is heat flux and $k_T$ is <thermal conductivity>.