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Chapter9 - 57:020 Mechanics of Fluids and Transport...

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57:020 Mechanics of Fluids and Transport Processes Chapter 9 Professor Fred Stern Fall 2010 1 Chapter 9 Flow over Immersed Bodies Fluid flows are broadly categorized: 1. Internal flows such as ducts/pipes, turbomachinery, open channel/river, which are bounded by walls or fluid interfaces: Chapter 8. 2. External flows such as flow around vehicles and structures, which are characterized by unbounded or partially bounded domains and flow field decomposition into viscous and inviscid regions: Chapter 9. a. Boundary layer flow: high Reynolds number flow around streamlines bodies without flow separation. b. Bluff body flow: flow around bluff bodies with flow separation.
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57:020 Mechanics of Fluids and Transport Processes Chapter 9 Professor Fred Stern Fall 2010 2 3. Free Shear flows such as jets, wakes, and mixing layers, which are also characterized by absence of walls and development and spreading in an unbounded or partially bounded ambient domain: advanced topic, which also uses boundary layer theory. Basic Considerations Drag is decomposed into form and skin-friction contributions: ( ) τ + ρ = S w S 2 D dA i ˆ t dA i ˆ n p p A V 2 1 1 C C Dp C f
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