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when dealing with natural convection, we use grashof's number. suppose we have a heated plate of temperature Tp. and heat being transferred to surrounding air by convection, air of temp Ta.

So film temp is Tf = 0.5(Tp + Ta)

If grashofs numbers, [tex]Gr = \frac { \beta gL^3 \delta T}{\nu^2}[/tex]

im wondering what [tex]\delta T[/tex] and what [tex]\beta[/tex] we use.

thanks