A spherical
thermocouple junction of diameter 0.706 mm is to be used for the measurement...

Question

A spherical
thermocouple junction of diameter 0.706 mm is to be used for the measurement of
temperature of gas stream. The convective heat transfer coefficient of the bead
surface is 400 W/m2K. Thermo physical properties of thermocouple material are k
= 20 WmK, C,, = 400 J/kg K and p = 8500 kg/m3. If the thermocouple initially at
30°C is placed in a hot stream of 300°C, the time taken by the bead to reach
298°C is 

(a) 2.35 sec
                        (b) 4.9 sec 

(c) 14.7 sec
                         (d) 29.4 sec

Abhijit · Accepted Answer

LUMPED CAPACITY ANALYSIS
LUMPED CAPACITY ANALYSIS
A spherical thermocouple junction of diameter 0.706 mm is to be used for the measurement of
temperature of gas stream. The convective heat transfer coefficient of the bead surface is 400
W/m2K.

A spherical thermocouple junction of diameter 0.706 mm is to be used for the measurement of temperature of gas stream. The convective heat transfer coefficient of the bead surface is 400 W/m2K. Thermo...

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