Q: A long, 0.6-m-OD 347 stainless
A long, 0.6-m-OD 347 stainless steel (k = 14 W/m K) cylindrical billet at 16°C room temperature is placed in an oven where the temperature is 260°C. If the average heat transfer coefficient is 170 W/m...
See AnswerQ: Repeat Problem 3.31(a), but assume that the
Repeat Problem 3.31(a), but assume that the billet is only 1.2 m long with the average heat transfer coefficient at both ends equal to 136 W/m2 K.
See AnswerQ: Consider a heat treatment process in which steel rods with a 10
Consider a heat treatment process in which steel rods with a 10 cm diameter at an initial temperature of 600°C are inserted into an oil bath at 25°C. Assuming a convection coefficient of 400 W/m2. K...
See AnswerQ: Ball bearings are to be hardened by quenching them in a water
Ball bearings are to be hardened by quenching them in a water bath at a temperature of 37°C. You are asked to devise a continuous process in which the balls roll from a soaking oven at a un...
See AnswerQ: Estimate the time required to heat the center of a 1.
Estimate the time required to heat the center of a 1.5-kg roast in a 163°C oven to 77°C. State your assumptions carefully and compare your results with cooking instructions in a standard cookbook.
See AnswerQ: A steel sphere with a diameter of 7.6 cm is
A steel sphere with a diameter of 7.6 cm is to be hardened by first heating it to a uniform temperature of 870°C and then quenching it in a large bath of water at a temperature of 38Â...
See AnswerQ: A monster turnip (assumed spherical) weighing in at 0.
A monster turnip (assumed spherical) weighing in at 0.45 kg is dropped into a cauldron of water boiling at atmospheric pressure. If the initial temperature of the turnip is 17°C, how lon...
See AnswerQ: An egg, which for the purposes of this problem is assumed
An egg, which for the purposes of this problem is assumed to be a 5-cm-diameter sphere having the thermal properties of water, is initially at a temperature of 4°C. It is immersed in boiling water at...
See AnswerQ: In the experimental determination of the heat transfer coefficient between a heated
In the experimental determination of the heat transfer coefficient between a heated steel ball and crushed mineral solids, a series of 1.5% carbon steel balls were heated to a temperature of 700°C and...
See AnswerQ: The heat transfer coefficient for a gas flowing over a thin flat
The heat transfer coefficient for a gas flowing over a thin flat plate 3-m long and 0.3-m wide varies with distance from the leading edge according to If the plate temperature is 170°C and...
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