Q: Reconsider the heat exchanger of Problem 6.38 with an externally
Reconsider the heat exchanger of Problem 6.38 with an externally finned-tube bundle used to enhance the air-side heat transfer coefficient in the pre-heater. If thin circular fins are attached on the...
See AnswerQ: Reconsider the heat exchanger of Problem 6.47, and explore
Reconsider the heat exchanger of Problem 6.47, and explore the effect of tube center-to-center spacing in the equilateral array of the finned tubes. Consider the tube spacing of 8.75 cm and 10 cm. Wha...
See AnswerQ: Derive an equation in the form /for the flow of air
Derive an equation in the form /for the flow of air over a long, horizontal cylinder for the temperature range 0°C to 100°C. Use Eq. (6.3) as a basis.
See AnswerQ: One method of storing solar energy for use during cloudy days or
One method of storing solar energy for use during cloudy days or at night is to store it in the form of sensible heat in a rock bed, as shown in the sketch. Suppose such a rock bed has been heated to...
See AnswerQ: Suppose the rock bed in Problem 6.50 has been completely
Suppose the rock bed in Problem 6.50 has been completely discharged and the entire bed is at 10°C. Hot air at 90°C and 0.2 m/s is then used to recharge the bed. How long does it take until the first r...
See AnswerQ: An automotive catalytic converter is a packed bed in which a platinum
An automotive catalytic converter is a packed bed in which a platinum catalyst is coated on the sur- face of small alumina spheres. A metal container holds the catalyst pellets and allows engine exhau...
See AnswerQ: In many metal machining operations (cutting or turning) the contact
In many metal machining operations (cutting or turning) the contact surface at the interface of the tool and metal part is cooled by a liquid coolant that is delivered on the surface by a single round...
See AnswerQ: A microprocessor chip 110 mm 3 10 mm square 2 is to
A microprocessor chip 110 mm 3 10 mm square 2 is to be cooled by an impinging circular air jet that is directed on the chip surface by a 5-mm diameter nozzle, placed at a distance of 10 mm. The...
See AnswerQ: Reconsider the problem described in Example 6.7, where water
Reconsider the problem described in Example 6.7, where water jets from a nozzle that has a diameter of 6 mm and impinges on a disk of 4 cm in diameter that is subjected to a uniform heat flux of 70,00...
See AnswerQ: Repeat Problem 6.5 for water in the temperature range 10
Repeat Problem 6.5 for water in the temperature range 10°C to 40°C.
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