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EGN_3358_Notes_Ch_6_Part 1

# EGN_3358_Notes_Ch_6_Part 1 - EGN 3358 Thermo-Fluids-Heat...

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1 EGN-3358 – Thermo-Fluids-Heat Transfer EGN 3358 Thermo-Fluids-Heat Transfer Chapter 6: External Flow – Fluid Viscous and Thermal Effects Part 1

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2 EGN-3358 – Thermo-Fluids-Heat Transfer 6.1: Introduction Define: Fluid : a substance that deforms continuously under the application of shear stress Fox, Intro to Fluid Mechanics ¸ 6th ed, 2004.
3 EGN-3358 – Thermo-Fluids-Heat Transfer Introduction Newtonian Fluid : one that exhibits a linear relationship between the rate at which the fluid deforms (strain rate) and the magnitude of applied shear stress, Ex. Water, air τ y u y u = μ τ τ μ viscosity (dynamic viscosity) 2 2 , ft s lbf m s N

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4 EGN-3358 – Thermo-Fluids-Heat Transfer Introduction No slip condition : the fluid adjacent to solid surface will move with the same velocity as the solid surface ρ μ ν = Kinematic viscosity: s ft s m 2 2 ,
5 EGN-3358 – Thermo-Fluids-Heat Transfer 6.2: External Boundary Layers ( 29 thickness layer boundary x = δ ( 29 L x << δ

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6 EGN-3358 – Thermo-Fluids-Heat Transfer External Boundary Layers (uniform) velocity stream free * U U u y x 99 . 0 where of value the is ) ( , thickness layer Boundary , * = δ δ U 0.99 to 0 from varies velocity the which in region the : layer boundary Fluid * layer boundary within the ed concentrat are stresses shear viscous of effect The * ( 29
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EGN_3358_Notes_Ch_6_Part 1 - EGN 3358 Thermo-Fluids-Heat...

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