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Question: Air flows from a large chamber in which the pressure and temperature are maintained at 725 kPa and 725 K, respectively, through a convergent-divergent nozzle and then into a constant diameter insulated pipe that in turn discharges into another large chamber in which the pressure is kept constant. The ratio of the nozzle exit area to the throat area of the nozzle is 2.4. The pipe has a diameter of 1.25 cm and a length of 30 cm. A friction factor of 0.005 can be assumed for the pipe flow. Find
a. The mass flow rate through the system if the pressure in the reservoir into which the flow is discharged is kept at 0 kPa.
b. The pressure in the reservoir into which the flow is discharged if there is a normal shock wave on the nozzle exit plane.
c. The maximum pressure in the reservoir into which the flow is discharged at which choked flow will exist in the nozzle-pipe system.
A Particle in a Cone A particle of mass m slides without friction inside an upside-down conical shell of semi vertical angle α, as shown in Figure 2.65.
A thin-walled concentric tube heat exchanger is used to cool engine oil from 175 °C to 55 °C with water that is available at 27 °C acting as a coolant. The oil and water flow rates are each 2.5 kg/s and the diameter of the inner tube is 0.7 m with a ..
Compute the minimum weight of block A shown for motion to be impending down the plane. Assume the pulley to be frictionless. Block B weighs 500 lb. The coefficient of static friction for all contact surfaces is 0.20.
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The diffusion constant (Do) and activation energy (Q) of C in BCC Fe is 0.01 cm2/sec and 80kJ/mol respectively. In FCC Fe, the values are 0.21 cm2/sec and 148kJ/mol. At exactly 910oC these two phases can co-exist.
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