Question: The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing the temperature-time history of a sphere fabricated from pure

to be determined by observing the temperature-time history of a sphere fabricated

from pure copper. The sphere, which is 20.0mm in diameter, is at

80C before it is inserted into the gas stream having a temperature

of 27C. A thermocouple on the outer surface of the sphere indicates

50C97.5 after the sphere is inserted into the hydrogen. What is the

The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing the temperature-time history of a sphere fabricated from pure copper. The sphere, which is 20.0mm in diameter, is at 80C before it is inserted into the gas stream having a temperature of 27C. A thermocouple on the outer surface of the sphere indicates 50C97.5 after the sphere is inserted into the hydrogen. What is the value of the specific heat of the copper at the average temperature of the process, in J/kg.K? J/kgK What is the value of the lumped thermal capacitance of the sphere, in J/K ? Solve for the thermal time constant, in sec. What is the value of the heat transfer coefficient, in W/m2K ? What is the value of the Biot number

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