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ENGG252 (DB225) Engineering Fluid Mechanics
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IF-185 A pump moves water from a reservoir to another reservoir through a piping system at a rate of 0.15 m^3/min. Both reservoirs are open the atmosphere. The elevation difference between the two reservoirs is 35 m and the total head loss is estimated to be 4 m. If the efficiency of the motor-pump unit is 65 percent, the electrical power input to the motor of the pump is
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DAM-127 Heat transfer coefficient is a function of a nondimensional parameter, which is functions of viscosity mu, specific heat c_p (kJ/kg.K), and thermal conductivity k (W/m.K). This nondimensional parameter is expressed as
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IF-168 Consider laminar flow of water in a 0.8-cm-diameter pipe at a rate of 1.15 L/min. The velocity of water halfway between the surface and the center of the pipe is
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A steady, two-dimensional velocity field is given by V = (u, v) = (2.5-1.6x)i + (0.7+0.8y)j where the x- and y-coordinates are in meters and the magnitude of velocity is in m/s. The volumetric strain rate in 1/s is
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DAM-129 The drag coefficient CD is a nondimensional parameter and is functions of drag force F_D, density rho, velocity V, and area A. The drag coefficient is expressed as
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DAM-135 Consider a boundary layer growing along a thin flat plate. This problem involves boundary layer thickness delta, downstream distance x, free-stream velocity V, fluid density rho, and fluid viscosity mu. The number of expected nondimensional parameters Pi’s of this problem is
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DAM-122 The primary dimensions of kinematic viscosity is
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DAM-128 Nondimensional heat transfer coefficient is functions of functions of convection coefficient h (W/m^2.K) thermal conductivity k (W/m.K), and characteristic length L. This nondimensional parameter is expressed as
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DAM-131 A one-third scale model of a car is to be tested in a wind tunnel. The conditions of the actual car are V = 75 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 velocity should be (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-124 The primary dimensions of the gas constant over the universal gas constant R/R_u is
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