Q: A thin-wall jacketed tank heated by condensing steam at one
A thin-wall jacketed tank heated by condensing steam at one atmosphere contains 91 kg of agitated water. The heat transfer area of the jacket is 0.9 m2 and the over- all heat transfer coefficient U =...
See AnswerQ: A large, 2.54-cm.-thick copper plate
A large, 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on one side is 28 W/m2 K and on the other side is 57 W/m2 K. If the temperature of both streams i...
See AnswerQ: A 1.4-kg aluminum household iron has a 500
A 1.4-kg aluminum household iron has a 500-W heating element. The surface area is 0.046 m2. The ambient temperature is 21°C, and the surface heat transfer coefficient is 11 W/m2 K. How long...
See AnswerQ: A small aluminum sphere of diameter D, initially at a uniform
A small aluminum sphere of diameter D, initially at a uniform temperature To, is immersed in a liquid whose temperature, T(, varies sinusoidally according to If the heat transfer coefficient between t...
See AnswerQ: A wire of perimeter P and cross-sectional area A emerges
A wire of perimeter P and cross-sectional area A emerges from a die at a temperature T (above the ambient temperature) and with a velocity U. Determine the temperature distribution along th...
See AnswerQ: High-strength steel is required for use in building structures and
High-strength steel is required for use in building structures and equipment (e.g., cranes). It is produced by heat treating quench-hardened steel in a process called tempering that reduces brittlenes...
See AnswerQ: Dielectric heating, also known as RF or high frequency heating,
Dielectric heating, also known as RF or high frequency heating, is a process in which a high-frequency alternating electric field or microwave electromagnetic radiation heats a dielectric material. An...
See AnswerQ: Water at a temperature of 77°C is to be evaporated
Water at a temperature of 77°C is to be evaporated slowly in a vessel. The water is in a low-pressure container surrounded by steam as shown in the sketch below. The steam is condensing at...
See AnswerQ: In the vulcanization of tires, the carcass is placed into a
In the vulcanization of tires, the carcass is placed into a jig and steam at 149°C is admitted suddenly to both sides. If the tire thickness is 2.5 cm, the initial temperature is 21Â&...
See AnswerQ: A 2.5-cm-thick sheet of plastic initially
A 2.5-cm-thick sheet of plastic initially at 21°C is placed between two heated steel plates that are maintained at 138°C. The plastic is to be heated just long enough for its mid plane temperatur...
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