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In Fig. 10.11 we have shown a tube bundle being used as a horizontal tube condenser. The total heat transfer rate is designated as QH. The outer diameter of the tubes is 1 in. and they are 4 ft long. If the condenser is set at a vertical position under the same operating conditions the total heat transfer rate is Qv. Determine the ratio of Qv to QH assuming that the flow is always laminar.
Nan crystalline materials have grain sizes ranging from 0.01 to 0.1 microns. If the contribution of grain boundary strengthening in an alloy with grains of 0.1 microns is 20 MPa, what would you expect it to be if the grain size were reduced to 0.01 m..
assume that a drop of mercury is an isolated sphere. what is the capacitance of a drop that results when 10 drops each
A compressor, having 80% efficiency, requires 25 MW power to pressurize air. Calculate the power requirement for the same inlet conditions and exit pressure if the compressor is made isentropic by redesigning it
a 12-in. length of aluminum tubing with properties of e 10.4 times 106 psi and alpha 12 times 10 -6 per degree
determine the force exerted by the die on the seal.
water at 400kpa with a quality of 25 has its temperature raised 20c in a constant-pressure process. what is the new
In the pipe contraction shown in Fig. P3.70, water flows steadily with a velocity of V1 = 0.5 m/s and V2 = 1.125 m/s. Two piezometer tubes are attached to the pipe at sections 1 and 2. Determine the height H. Neglect any losses through the contract..
The bottom section is DN 150, the middle is DN 125, and the top is DN 100. The air is at 0°C and standard atmospheric pressure.
air undergoes a isentropic compression in a piston-cylinder assembly from p1- 1atm t1 70 f to p2 5 atm. assuming air
A material is found to have a tenth-thickness of 2.3 cm for 1.25-MeV gamma rays. What is the linear attenuation coefficient for this material? What is the half-thickness? What is the mean-free-path length for 1.25 MeV photons in this material?
The water surfaces in the two reservoirs are at the same elevation. When the pump adds 20 kW to the water, the flowrate is 1 m0. /s. If minor losses are negligible, determine the pipe diameter.
The pressure in a tire depends on the temperature of the air in the tire. The gage pressure of an automobile tire with a volume of 0.025 m3 is measured to be 210 kPa at 25 oC at sea level on a day with calm weather. If the temperature of the air in t..
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