ch62 - Chapter 6: Viscous Flow in Ducts 6.1 Reynolds Number...

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Chapter 6: Viscous Flow in Ducts 6.1 Reynolds Number Regimes 6.2 Internal vs External Fluid Flows 6.3 Head Loss – The Friction Factor 6.4 Laminar Fully Developed Pipe Flow 6.5 Turbulence Modeling 6.6 Turbulent Pipe Flow 6.7 Four Types of Pipe Flow 6.8 Flow in Noncircular Ducts* 6.9 Minor Losses Pipe Systems* 6.10 Multiple Pipe Systems* 6.11 Diffuser Performance* 6.12 Fluid Meters* * skim
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INTERNAL FLOW EXTERNAL FLOW inviscid
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INTERNAL FLOW – Pipe/Duct
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LAMINAR Pipe Flow Re< 2300 U o = U avg = U = Q/A OUTSIDE BOUNDARY LAYER TREAT AS INVISCID, CAN USE B.E. Laminar-Turbulent Transition (Fully Developed Laminar Flow) LAMINAR Duct Flow Re<1500 (2100 for MYO) (2000 for SMITS) to be treated as inviscid – viscous forces not important
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PIPE Re D = 1600 LAMINAR Pipe Flow Re< 2300 (2100 for MYO) LAMINAR Duct Flow Re<1500 (2000 for SMITS) DUCT H = 0.2 cm, U avg = 3.2 cm, Re H = 64 FULLY DEVELOPED LAMINAR FLOW
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U avg = 6 cm/s D = d = 27 mm Re d = ρ U avg D/ μ = U avg D/ ν = 1600 Hydrogen Bubble Method LAMINAR PIPE FLOW: L e /D ~ 0.06 Re D L eMAX = 0.06(2300)D = 138D LAMINAR PIPE FLOW ENTRANCE LENGTH TO BE FULLY DEVELOPED
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pressure must drop Where fully developed pressure gradient balances wall shear stress no acceleration Parabolic velocity profile when fully developed LAMINAR FLOW
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This note was uploaded on 04/26/2010 for the course MAE 101B 101B taught by Professor Rohr during the Summer '09 term at UCSD.

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ch62 - Chapter 6: Viscous Flow in Ducts 6.1 Reynolds Number...

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