Nusselt number

(Sometimes called heat transfer coefficient.) A nondimensional number arising in the problem of heat transfer in fluids.

It may be written

where Q is the quantity of heat transferred in unit time from an immersed body across an area S, ΔT a characteristic temperature difference, L a characteristic length, and k the thermal conductivity. With suitable choices of characteristic quantities, it may be interpreted as a ratio of heat actually transferred to heat that would be transferred under the circumstances by pure conduction.

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0
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