Engineering, 22.08.2019 04:30, leothedrifter
Two long concentric cylinders the outer cylinder with diameter of 50cm and its inner surface is at 1000k with emissivity of 0.9. the inner cylinder of diameter 20cm and its outer surface is at 300k with emissivity of 0.2. a shield cylindrical surface with diameter of 35cm. the outer surface of the shield is with emissivity of 0.03 and of the inner surface is 0.05. find the reduction in heat transfer by radiation between the outer and inner cylinder.
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