Two concentric spheres of diameters D1 = 0.3 m andD2 = 0.4 m are maintained at uniform temperatures T1 = 700 Kand T2 = 500 K and have emissivities «1 = 0.5 and «2 = 0.7,respectively. Determine the net rate of radiation heat transferbetween the two spheres. Also, determine the convection heattransfer coefficient at the outer surface if both the surroundingmedium and the surrounding surfaces are at 30°C. Assume theemissivity of the outer surface is 0.35.

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Radiation

Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation from a cooler object is less intense as compared to the radiation from hot objects.