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Lecture 27

Lecture 27 - Lecture 27 pls-27.1 Fluid Dynamics I Media 1...

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Lecture 27 pls-27.1 Fluid Dynamics I Media: 1. Vortices pictures 2. Two cylinders with marbles 2. Venturi tube (w/ camera) Fluid Flow is inherently complex. ~ 10 23 atoms/cm 3 . Relative internal motion is often important 1. Fluid Parameters Important to Flow (Dynamics) density ρ [kg/m 3 ] viscosity η [kg/(m s)] Two cylinders with marbles demo compressibility P P V V C = = ρ ρ 0 0 1 1 [1/Pa] Can measure compressibility using a closed container A F P = , x A V = Æ x F V A A F x A V C = = 0 2 0 1 Clicker question 1. Can have smooth flow here. What happens downstream? Can be quite complex! F x A 0 V V

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Lecture 27 pls-27.2 2. Characterization of Flow A. Compressible vs Incompressible P C = ρ ρ 0 1 Æ P C = 0 ρ ρ Compressible : Density ρ not constant. Gases if P variations are significant Incompressible : Density ρ is constant. Gases if P variations are not significant; Liquids.
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