A sphere is used for the temperature measurement of a gas stream. The time constant for the thermocouple is 2s. determine the temperature (in °C) attained by a thermocouple in 5.2s. The junction temperature is 25ºC and the gas stream temperature is 200ºC. The convection coefficient is h = 400W/m2K and the thermophysical properties are K= 20W/mK density is 8500 kg/m3 and specific heat is 400 J/Kg K.
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