The two concentric spheres of diameters Di = 20 cmand Do = 30 cm are separated by air at 1 atm pressure. Thesurface temperatures of the two spheres enclosing the air areTi = 320 K and To = 280 K, respectively. Determine the rateof heat transfer from the inner sphere to the outer sphere bynatural convection.

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Chapter1: Units, Trigonometry. And Vectors
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The two concentric spheres of diameters Di = 20 cm
and Do = 30 cm are separated by air at 1 atm pressure. The
surface temperatures of the two spheres enclosing the air are
Ti = 320 K and To = 280 K, respectively. Determine the rate
of heat transfer from the inner sphere to the outer sphere by
natural convection.

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