In an experiment, the temperature of a hot gas stream is to be measured by a thermocouple with a… 1 answer below »

In an experiment, the temperature of a hot gas stream is to be measured by a thermocouple with a spherical junction. Due to the nature of this experiment, the response time of the thermocouple to register 99 percent of the initial temperature difference must be within 5 s. The properties of the thermocouple junction are k =  35 W/m·K, r = 8500 kg/m3, and cp = 20 J/kg·K. If the heat transfer coefficient between the thermocouple junction and the gas is 250 W/m2·K, determine the diameter of the junction.

 

 

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