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Two concentric spheres of diameters D1 = 0.3 m and D2 = 0.8 mare maintained at uniform temperatures T1 = 423 C and T2 =

Two concentric spheres of diameters D1 = 0.3 m and D2 = 0.8 mare maintained at uniform temperatures T1 = 423 C and T2 = 113 C and have emissivities 1 = 0.34 and 2 = 0.67, respectively. Calculate the net rate of heat transfer between the spheres per unit area. Answers may be between 3926 and 4086

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