A thermocouple junction is inserted in a large duct
Chapter 7, Problem 7.86(choose chapter or problem)
A thermocouple junction is inserted in a large duct tomeasure the temperature of hot gases flowing throughthe duct. (a) If the duct surface temperature Tsis less than thegas temperature Tg, will the thermocouple sense atemperature that is less than, equal to, or greaterthan Tg? Justify your answer on the basis of a sim-ple analysis.(b) A thermocouple junction in the shape of a 2-mm-diameter sphere with a surface emissivity of 0.60is placed in a gas stream moving at 3 m/s. If thethermocouple senses a temperature of 320?Cwhen the duct surface temperature is 175?C, whatis the actual gas temperature? The gas may beassumed to have the properties of air at atmos-pheric pressure.(c) How would changes in velocity and emissivityaffect the temperature measurement error? Deter-mine the measurement error for velocities in therange 1V25 m/s (??0.6) and for emissivi-ties in the range 0.1?1.0 (V?3 m/s).
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