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CE 230-Engineering Fluid Mechanics Lecture # 4and5 Fluid properties (2)

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Examine velocity distribution in pipe

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Viscosity Consider two plates separated be a thin film of fluid. The lower plate is fixed and the upper is moving with a constant velocity. Investigate what is happening in the fluid in terms of flow or stresses.

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Viscosity No slip boundary condition Relation between shear stress and velocity gradient Classification of fluids

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Mechanisms of fluid resistance to shear stress Particle cohesion Transfer of molecular momentum Influence of temperature on viscosity

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Units of viscosity Dynamic viscosity absolute viscosity viscosity Kinematic viscosity

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Influence of temperature on viscosity

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Classification of fluids according to relation of shear to strain rate

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Problems on viscosity Board sliding on an inclined surface separated by a thin film of oil Is there a shear stress in the film? let’s calculate the terminal velocity

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Problem # 34

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Problem # 39 Calculate the weight of piston given : Terminal velocity μ Spacing between piston and cylinder Piston dimensions

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Problem 2.39

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Problem 2.41

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