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Water at a local bulk temperature of 24°C flows at 0.8 m/s through a smooth, 1.5-cm-ID tube that is kept at 30°C and the flow is fully developed. The system is extremely clean and quiet, and the flow stays laminar until a noisy air compressor is turned on in the laboratory. Then it suddenly goes turbulent. Calculate the ratio of turbulent to laminar heat transfer coefficients. Air at 227C flows across the pipe at 20 m/s. Find the pipe wall temperature, assuming the water flow to be turbulent.
air flows steadily at low speed through nozzle distance charging to atmosphere. the area at the nozzle inlet is
Consider the construction of a wind farm composed of 100 wind turbines each with a rated capacity of 2 MW at a rated wind speed of 14 m/s. The turbines have an installed cost of $3000/kW, including the cost of land, and require an operations and main..
A child releases a helium-filled party balloon. It is filled with low-quality helium so that the net specific gravity (compared to ambient air) is 0.15, including a small allowance for the the light balloon shell. Its initial acceleration oppos..
why does a car engine stop when we turn the key even when the vehicle is running? the engine should run on alternator
an orthotropic material has the follow properties ex 7500 ksi ey 2500 ksi gxy 1250ksi and vxy .25. determine the
while an oil well is being drilled at a depth of 6000 ft it is observed that the top of the 8-in.-diameter steel drill
the temperature in a vessel is 36 degree c and the proportion by mass of air to dry saturated steam is 0.1. what is the
A reversible heat engine, operating in a cycle, withdraws heat from a high-temperature reservoir (the temperature of which consequently decreases), performs work w, and rejects heat into a low-temperature reservoir (the temperature of which consequen..
Ammonia as a saturated vapor at 130 psi expands is thermally in an internally reversible process to a pressure of 18 psi. Determine the heat transfer and work for this process.
a blower develops 750mm of water gauge at a speed of 1480rpm and a flow rate of 38cubicmeter per sec. determine the
determine the number of automobiles with premair catalyst treated radiators needed to reduce the ozone concentration in
a shaft is made of a steel alloy having an allowable shear stress of 12 ksi. If the diameter of the shaft is 1.5 in., determine the maximum torque T that can be transmitted. What would be the maximum torque T' if a 1 in. diameter hole is bored thr..
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