A thermocouple whose surface is diffuse and gray with an
Chapter , Problem 12.76(choose chapter or problem)
A thermocouple whose surface is diffuse and gray with an emissivity of 0.6 indicates a temperature of 180 C when used to measure the temperature of a gas flowing through a large duct whose walls have an emissivity of 0.85 and a uniform temperature of 450 C. (a) If the convection heat transfer coefficient between the thermocouple and the gas stream is and there are negligible conduction losses from the thermocouple, determine the temperature of the gas. (b) Consider a gas temperature of 125 C. Compute and plot the thermocouple measurement error as a function of the convection coefficient for 10 . What are the implications of your results? h 1000 W/m2
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