Lecture 2 Boundary layer concept.pptx - Mechatronics Engineering Department Fluid Mechanics 2 Instructor Dr Arafa S.Sobh Assistant Professor Mechanical

Lecture 2 Boundary layer concept.pptx - Mechatronics...

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Fluid Mechanics 2 Instructor : Assistant Professor Mechanical Engineering Department Faculty of Engineering Helwan University Dr. Arafa S.Sobh Mechatronics Engineering Department
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Laminar flow Combined flow Turbulent flow BOUNDARY LAYER FLOWS
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5. Dynamic Viscosity ( ): A property that determines the amount of its resistance to shearing stress. x dx v+dv v moving plate Fixed plate v dv/dx = (dv/dx) = (v/x) = /(v/x) where: - absolute or dynamic viscosity in Pa-sec - shearing stress in Pascal v - velocity in m/sec x -distance in meters Dynamic Viscosity is the measure of a fluid’s resistance to internal shear stresses.
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What is hydrostatics? Properties of Fluids The kinematic viscosity of a fluid is the ratio of its dynamic viscosity to its density. 6- Kinematic Viscosity ( ) = kinematic viscosity, m 2 /s = Dynamic viscosity, N.s/m 2 or Pa.s = Density of fluid, kg/m 3 =
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W know that fluids adhere the solid walls and they take the solid wall velocity. When the wall does not move also the velocity of fluid on the wall is zero. In region near the
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