The temperature of a gas stream is to be measured by a thermocouple whose junction can be approximated to a 1·2 mm-diameter sphere. The properties of the junction are:
J/kgK,320andkg/m8500,
W/mK353pCk.
The heat transfer coefficient between the junction and the gas is W/m²K65 h10.
Determine how long it will take for the thermocouple to read 99% of the initial temperature difference.
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