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# Engineering Fluid Mechanics ENGR 335

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This 4 page Study Guide was uploaded by Mr. Walton Littel on Friday October 23, 2015. The Study Guide belongs to ENGR 335 at University of Idaho taught by Staff in Fall. Since its upload, it has received 33 views. For similar materials see /class/227749/engr-335-university-of-idaho in General Engineering at University of Idaho.

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Date Created: 10/23/15

ENGR 335 KEY WORDS AND STUDY QUESTIONS FOR CH 5 general extensive property volume flow rate general intensive property discharge control volume mass flow rate control surface area average velocity Reynolds transport theorem mean velocity system unit outward normal vector conservation of mass continuity equation 1 Describe in words the meaning of the following two integrals d a J Jpr where N is the number of Xenon molecules per kilogram of gas I CV b INpKdA where N is the number of Xenon molecules per kilogram of gas CS 2 What principle is used to calculate the liquid level of a tank with one fill and one drain pipe Make a sketch of the tank and write the equation you would use 3 We have incompressible flow through a nozzle The area average velocity at the entrance is known What principle is used to determine the area average velocity at any point along the nozzle Write the equation you would use energy equation kinetic energy potential energy internal energy enthalpy mechanical energy thermal energy ENGR 335 heat transfer rate shaft work rate ow work rate static pressure pump work rate blower work rate fan work rate turbine work rate KEY WORDS AND STUDY QUESTIONS FOR CH 7 HGL EGL pump head turbine head pressure head velocity head piezometric head total head kinetic energy correction factor pipe ow energy equation eXtended Bernoulli equation pump ef ciency head loss turbine ef ciency 1 Discuss the kinds of ows for which the pipe ow energy equation eqn 724 can be used Give two examples of pipe ows where it will not work 2 Write the relationship between a pump head hp and power to drive the pump and b turbine head ht and power produced by the turbine Include pump ef ciency and turbine ef ciency in these relationships 3 What is the fundamental cause of hL Is hL always positive 4 What equations should be used to relate pressure and velocity at the inlet and outlet of a nozzle Discuss assumptions 5 Give the sign conventions for heat transfer and shaft work 6 Under what conditions does the pipe ow energy equation reduce to the Bernoulli equation 7 Under what conditions are the HGL and EGL coincident ENGR 335 KEY WORDS AND STUDY QUESTIONS FOR CH 1 AND CH 2 hydrostatics hydrodynamics gas dynamics system extensive property intensive property density speci c weight speci c gravity shear stress shear strain shear strain rate velocity distribution velocity gradient velocity pro le Newtonian uid absolute viscosity dynamic viscosity kinematic viscosity NonNewtonian uid surface tension force contact line contact angle surfactant vapor pressure cavitation bulk modulus compressibility 1 Give an example of an engineering application that requires knowledge of uid mechanics 2 What happens to a Newtonian uid as a shear stress is applied What happens to a solid as a shear stress is applied Where are surface tension forces most likely to be signi cant In what direction do surface tension forces act How does the absolute viscosity of nitrogen vary with temperature Of water Of oil Can cavitation occur in a building compressed air supply piping network Why or why not What is the strain rate in a ow eld where velocity is uniform over all space What is the shear stress Give an example of a nonNewtonian uid and describe the behavior that indicates that it is not Newtonian KEY WORDS AND STUDY QUESTIONS FOR CH 10 laminar pipe ow HagenPoiseuille ow Reynolds number equivalent sand roughness friction factor DarcyWeisbach equation Moody diagram Colebrook correlation Haaland correlation Nikuradse correlation area average velocity volume ow rate discharge ENGR 335 turbulent pipe ow turbulence models viscous sublayer logarithmic layer powerlaw model relative roughness hydraulically smooth regime transition roughness regime completely rough regime positive displacement pump dynamic pump centrifugal pump piston pump gear pump loss coef cient minor losses pump curve stall point free ow point system curve entrance effects entrance length node 1 Does the area average velocity change in the entrance region of a pipe Why or Why not 2 What conservation principle is used to obtain the shear stress distribution in laminar pipe ow Why are the terms on the right hand side of the conservation equation equal to zero 3 Describe a piping system where it is a good approximation to neglect tting and transition losses 4 Give the two hL that can be calculated from conservation principles How are all the other hL obtained 5 A pump curve gives the head produced by a pump as a function of iii 7 How is a pump curve obtained 6 How can we predict if a pipe ow will be laminar or turbulent

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