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ENGG252 (DB225) Engineering Fluid Mechanics
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IF-173 The pressure drop for a given flow is determined to be 100 Pa. For the same flow rate, if we reduce the diameter of the pipe by half, the pressure drop will be
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LAM-108 The velocity of wind at a wind turbine is measured to be 8 m/s. The blade span diameter is 12 m. The density of air is 1.2 kg/m^3. If the horizontal force exerted by the wind on the supporting mast of the wind turbine is 1620 N, the efficiency of the wind turbine is
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LAM-114 Water enters the impeller of a centrifugal pump radially at a rate of 450 L/min when the shaft is rotating at 400 rpm. The tangential component of absolute velocity of water at the exit of the 70-cm outer diameter impeller is 55 m/s. The torque applied to the impeller is
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LAM-99 When determining the thrust developed by a jet engine, a wise choice of control volume is
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LAM-111 A 3-cm-diameter horizontal pipe attached to a surface makes a 90-degree turn to a vertical upward direction before the water is discharged at a velocity of 6 m/s. The horizontal section is 5-m-long and the vertical section is 4-m long. Neglecting the mass of the pipe and considering the weight of the water contained in the pipe, the bending moment acting on the base of the pipe on the wall is
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LAM-100 Consider an airplane cruising at 850 km/h to the right. If the velocity of exhaust gases is 700 km/h to the left relative to the ground, the velocity of the exhaust gases relative to the nozzle exit is
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LAM-102 Consider water flow through a horizontal, short garden hose at a rate of 30 kg/min. The velocity at the inlet is 1.5 m/s and that at the outlet is 11.5 m/s. The hose makes a 180-degree turn before the water is discharged. Disregard the weight of the hose and water. Taking the momentum-flux correction factor to be 1.04 at both the inlet and the outlet, the anchoring force required to hold the hose in place is
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LAM-109 The shaft of a turbine rotates at a speed of 800 rpm. If the torque of the shaft is 350 N.m, the shaft power is
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LAM-103 A water jet strikes a stationary vertical plate horizontally at a rate of 5 kg/s with a velocity of 35 km/h. Assume the water stream moves in the vertical direction after the strike. The force needed to prevent the plate from moving horizontally is
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LAM-110 A 3-cm-diameter horizontal pipe attached to a surface makes a 90-degree turn to a vertical upward direction before the water is discharged at a velocity of 9 m/s. The horizontal section is 5-m-long and the vertical section is 4-m long. Neglecting the mass of the water contained in the pipe, the bending moment acting on the base of the pipe on the wall is
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