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https://en.wikipedia.org/wiki/Nusselt_number#Dittus%E2%80%93Boelter_equation says:
> n = 0.4 for the fluid being heated, and n = 0.3 for the fluid being cooled.
WTAF. Why do we have different power laws for heat transfer between a solid and liquid when the flow is turbulent _depending on the direction of heat transfer_? I can't think of any simple mean field approximation of the process that would yield that.
