Question: A small copper wire with a diameter 0.792 mm and initially at 366.5 K is suddenly immersed in a liquid held constant 311 K.

A small copper wire with a diameter 0.792 mm and initially at

A small copper wire with a diameter 0.792 mm and initially at 366.5 K is suddenly immersed in a liquid held constant 311 K. The convection coefficient h = 85.2 W/m K. The physical properties can le assumed constant and are k = 374 W/m K. c, = 0.389 kJ/kg K, and p = 8890 kem (a) Determine the time in seconds for the average temperature of the wire to drop to 338.8 K (one-half the initial temperature difference). (b) Do the same but for h = 11.36 W/m K. (c) For part (b), calculate the total amount of heat removed for a wire L0m long. %3D %3D Ans. (a)t=5s

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