A hot steel sphere is dropped into a large cold oil bath as part of a quenching process to harden the steel. Assume that

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A hot steel sphere is dropped into a large cold oil bath as part of a quenching process to harden the steel. Assume that

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A Hot Steel Sphere Is Dropped Into A Large Cold Oil Bath As Part Of A Quenching Process To Harden The Steel Assume That 1
A Hot Steel Sphere Is Dropped Into A Large Cold Oil Bath As Part Of A Quenching Process To Harden The Steel Assume That 1 (246.31 KiB) Viewed 59 times
A hot steel sphere is dropped into a large cold oil bath as part of a quenching process to harden the steel. Assume that the thermal capacitance of the steel sphere is C = 440J/°C and the average convective thermal resistance between the sphere and the oil is R = 0.05°C/W. If the sphere is originally at T. = 800°C and the oil is at 25°C, how long does it take for the sphere to approximately reach the temperature of the oil? = >> 100 seconds 88 seconds << 1 second 22 seconds
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