A thin coating, which is applied to long,
Chapter 12, Problem 12.103(choose chapter or problem)
A thin coating, which is applied to long, cylindricalcopper rods of 10-mm diameter, is cured by placingthe rods horizontally in a large furnace whose wallsare maintained at 1300 K. The furnace is filled withnitrogen gas, which is also at 1300 K and at a pressureof 1 atm. The coating is diffuse, and its spectral emis-sivity has the distribution shown.(a) What are the emissivity and absorptivity of thecoated rods when their temperature is 300 K?(b) What is the initial rate of change of theirtemperature?(c) What are the emissivity and absorptivity of thecoated rods when they reach a steady-statetemperature?(d) Estimate the time required for the rods to reach1000 K
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