What expression should be used to calculate Nusselt number for free convection (of air) in a vertical channel with walls at different temperatures?(adsbygoogle = window.adsbygoogle || []).push({});

I have the Bar-Cohen and Rohsenow equations, but I am unsure which situation this corresponds to (and thus which constants to use).

Symmetric isothermal plates (wouldn't this imply Ts,1 = Ts,2 which is not the case?)

Symmetric isoflux

Isothermal/adiabatic (I am leaning towards this)

Isoflux/adiabatic

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# Natural convection

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