A thermocouple whose surface is diffuse and gray withan
Chapter 12, Problem 12.76(choose chapter or problem)
A thermocouple whose surface is diffuse and gray withan emissivity of 0.6 indicates a temperature of 180Cwhen used to measure the temperature of a gas flowingthrough a large duct whose walls have an emissivity of0.85 and a uniform temperature of 450C.(a) If the convection heat transfer coefficient betweenthe thermocouple and the gas stream isand there are negligible conduc-tion losses from the thermocouple, determine thetemperature of the gas.(b) Consider a gas temperature of 125C. Computeand plot the thermocouple measurement erroras afunction of the convection coefficient for 10. What are the implications ofyour results?
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