One end of a 0.3-m-long steel rod is connected to a wall at 204°C. The other end is connected to a wall that is maintained at 93°C. Air is blown across the rod so that a heat transfer coefficient of 17 W/(m2 K) is maintained over the entire surface. If the diameter of the rod is 5 cm and the temperature of the air is 38°C, what is the net rate of heat loss to the air?

GIVEN



FIND

The net rate of heat loss to the air (qf)

ASSUMPTIONS

The wall temperatures are constant

The system is in steady state

The rod is 1% carbon steel

The thermal conductivity of the rod is uniform and not dependent on temperature

One dimensional conduction along the rod

SKETCH


The rod can be idealized as a fin of uniform cross section with fixed temperatures at both ends. The rate of heat loss is.



Physics & Space Science

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