This experiment is conducted to determine the emissivity of a certain material. A lone cylindrical rod of diameter D1 = 0.01 m is coated with this new material and is placed in an evacuated lone cylindrical enclosure of diameter D2 = 0.1 m and emissivity E2 = 0.95, which is cooled externally and maintained at a temperature of 200 K at all times. The rod is heated by passing electric current through it. When steady Operating conditions are reached, it Is observed that the rod Is dissipating electric power at a rate of 8 W per unit or its leneth and its surface temperature is 500 k, Based on these measurements, determine the emissivity of the coatine on the rod

This experiment is conducted to determine the emissivity of a certain material. A lone cylindrical rod of diameter D1 = 0.01 m is coated with this new material and is placed in an evacuated lone cylindrical enclosure of diameter D2 = 0.1 m and emissivity E2 = 0.95, which is cooled externally and maintained at a temperature of 200 K at all times. The rod is heated by passing electric current through it. When steady Operating conditions are reached, it Is observed that the rod Is dissipating electric power at a rate of 8 W per unit or its leneth and its surface temperature is 500 k, Based on these measurements, determine the emissivity of the coatine on the rod

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.43P

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