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Design a 1-m-long cylindrical wind tunnel whose diameter is 25 cm operating at a Mach number of 1.8. Atmospheric air enters the wind tunnel through a converging- diverging nozzle where it is accelerated to supersonic velocities. Air leaves the tunnel through a converging-diverging diffuser where it is decelerated to a very low velocity before entering the fan section. Disregard any irreversibilities. Specify the temperatures and pressures at several locations as well as the mass flow rate of air at steady-flow conditions. Why is it often necessary to dehumidify the air before it enters the wind tunnel?
a household refrigerator with a coefficient of performance of 2.4 removes energy from the refrigerated space at a rate
an air standard brayton closed cycle receives air at 1 atm and 298 k. the upper temperature and pressure limits are 5
Consider a T shaped wooden beam comprised of a 2 x 6 and a 2 x 8 20 feet long. [Use nominal dimensions for beam cross section.] A steel plate 20 feet long and of cross section 6 x ½ inches is fastened to the top of the T. Calculate the bending stress..
air enters a one-inlet one-exit control volume at 6 bar 500 k and 30 ms through a flow area of 28 cm2. at the exit the
estimate the velocity with which you would contact the ground if you jumped from an airplane at an altitude of 5000 ft
Are the systolic and diastolic pressures reported in blood pressure measurements absolute, gage, or vacuum pressures? When the instrument panel of a car provides the outside air temperature, where is the temperature sensor located?
coming out of a factory chimney are the following gases co2 so2 o2 n2 h2o with volume percentage to be 13.5 0.3 5.2 76
If the project replacement will have the same first cost, life, salvage value, and operating and maintenance costs as the original, what is the capitalized cost of perpetual service?
an insulated piston-cylinder device initially contains 9.647 lb of air at 20 psia and 60ordmf. then 1000 btu per lb of
the amplitude during start-up conditions should not exceed 20 mm; and (d) the force transmitted to the foundation should be less than 10,000 N.
two tempered steel bars each 316 in thick are bonded to a 12 in mild steel bar. this composite is subjected as shown to
how does the total free energy for transformation ?gtotal vary for a liquid-solid transformation versus that for a
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