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ENGG252 (DB225) Engineering Fluid Mechanics
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DAM-132 A one-fourth scale model of a car is to be tested in a wind tunnel. The conditions of the actual car are V = 45 km/h and T = 0 degree-C and the air temperature in the wind tunnel is 20 degree-C. In order to achieve similarity between the model and the prototype, the wind tunnel is run at 204 km/h. If the average drag force on the model is measured to be 70 N, the drag force on the prototype is (The properties of air at 1 atm and 0 degree-C: rho = 1.292 kg/m^3, nu= 1.338x10^-5 m^2/s ; The properties of air at 1 atm and 20 degree-C: rho = 1.204 kg/m^3, nu = 1.516x10^-5 m^2/s)
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DAM-125 The primary dimensions of the universal gas constant R_u is
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DAM-134 A one-fourth scale model of an airplane is to be tested in water. The airplane has a velocity of 700 km/h in air at -50 degree-C. The water temperature in the test section is 10 degree-C. In order to achieve similarity between the model and the prototype, the test is done at a water velocity of 393 km/h. If the average drag force on the model is measured to be 13,800 N, the drag force on the prototype is (The properties of air at 1 atm and -50 degree-C: rho = 1.582 kg/m^3, mu = 1.474x10^-5 kg/m.s ; The properties of water at 1 atm and 10 degree-C: rho = 999.7 kg/m^3, mu = 1.307x10^-3 kg/m.s)
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DAM-136 Consider unsteady fully developed Couette flow-flow between two infinite parallel plates. This problem involves velocity component u, distance between the plates h, vertical distance y, top plate speed V, fluid density rho, fluid viscosity mu, and time t. The number of expected nondimensional parameters Pi’s of this problem is
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OCF-152 Consider water flow in a rectangular open channel of height 2 m and width 5 m containing water of depth 1.5 m. The hydraulic radius for this flow is
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OCF-151 If the flow depth remains constant in an open-channel flow, the flow is called
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OCF-162 Water discharges into a rectangular horizontal channel from a sluice gate and undergoes a hydraulic jump. The channel is 25-m-wide and the flow depth and velocity before the jump are 2 m and 9 m/s, respectively. The flow depth after the jump is
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OCF-166 The flow rate of water in a 3-m-wide horizontal open channel is being measured with a 0.4-m-high sharp-crested rectangular weir of equal width. If the water depth upstream is 0.9 m, the flow rate of water is
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OCF-154 Water flows in a rectangular open channel of width 0.6 m at a rate of 0.25 m^3/s. If the flow depth is 0.2 m, what is the alternate flow depth if the character of flow were to change?
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OCF-163 Water discharges into a rectangular horizontal channel from a sluice gate and undergoes a hydraulic jump. The flow depth and velocity before the jump are 1.25 m and 6 m/s, respectively. The percentage available head loss due to the hydraulic jump is
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