2. Heat transfer occurs by radiation in vacuum between the outer surface of the inner cylinder (1) and the inner surface

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2 Heat Transfer Occurs By Radiation In Vacuum Between The Outer Surface Of The Inner Cylinder 1 And The Inner Surface 1 (55.7 KiB) Viewed 20 times

2. Heat transfer occurs by radiation in vacuum between the outer surface of the inner cylinder (1) and the inner surface of the outer cylinder (2). The cylinder length is 1 m. The radius of cylinder (1) and cylinder (2) are 1 and 3 cm, for each. The temperature of cylinder (1), T₁ = 27 °C and cylinder (2), T2 = 127 °C. Both cylinders are gray bodies with ε = 0.3. a) Overall interchange factor F12, F21 = ? b) What is the net heat transfer by radiation? (2) 3 cm (1) 1 cm 1 m