Consider an L × L horizontal plate that is placed in quiescent air with the hot surface facing up. If the film temperature is 20°C and the average Nusselt number in natural convection is of the form Nu = CRaⁿ_L, show that the average heat transfer coefficient can be expressed as

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h = 1.95(AT/L)"4 104 < Ra, < 107 < 107 1.79ATV3 h = 107 < Ra, < 1011