# ch6 part 1 - Thermo-Fluids Heat Transfer Chapter 6 External...

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

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6.1: Introduction Define: Fluid : a substance that deforms continuously under the application of shear stress EGN 3358 - Thermo-Fluids Heat Transfer Fox, Intro to Fluid Mechanics, 6 th ed, 2004 2
6.1: Introduction EGN 3358 - Thermo-Fluids Heat Transfer 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, Example: water, air μ viscosity (dynamic viscosity) 3

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6.1: Introduction EGN 3358 - Thermo-Fluids Heat Transfer No slip condition : the fluid adjacent to solid surface will move with the same velocity as the solid surface Kinematic viscosity: 4
6.2: External Boundary Layers EGN 3358 - Thermo-Fluids Heat Transfer 5

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6.2: External Boundary Layers EGN 3358 - Thermo-Fluids Heat Transfer * freestream velocity (uniform) *Fluid boundary layer: the region in which the velocity varies from 0 to 0.99 * δ, Boundary layer thickness, δ(x) is the value of y where u = 0.99 *The effect of viscous sheer stresses are concentrated within the boundary layer *Outside of the boundary layer, the flow can be considered as inviscid 6
6.2:

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ch6 part 1 - Thermo-Fluids Heat Transfer Chapter 6 External...

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