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A spherical thermocouple junction of diameter 0.706 mm is to be used for the measurement of temperature of a gas stream. The convective heat transfer coefficient on bead surface is 400 W/m2K. Thermophysical properties of thermocouple material are k=20 W/mK, c=400 J/kgK and ρ=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 |
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Answer» A spherical thermocouple junction of diameter 0.706 mm is to be used for the measurement of temperature of a gas stream. The convective heat transfer coefficient on bead surface is 400 W/m2K. Thermophysical properties of thermocouple material are k=20 W/mK, c=400 J/kgK and ρ=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 |
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