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

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Presentation transcript:

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

Examine velocity distribution in pipe

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.

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

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

Units of viscosity Dynamic viscosity absolute viscosity viscosity Kinematic viscosity

Influence of temperature on viscosity

Classification of fluids according to relation of shear to strain rate

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

Problem # 34

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

Problem 2.39

Problem 2.41

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