Chapter_14_Fluids-1

Chapter_14_Fluids-1 - Chapter 14 - Fluids Pressure...

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Chapter 14 - Fluids Pressure variation with height or depth Pascal’s Principle Archimedes Principle Fluid Flow Bernoulli’s Equation
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Fluid Matter that cannot maintain its own shape and therefore flows readily under the influence of forces Gases – Do not maintain their size (volume) Liquids – Do maintain their size – “incompressible” Solids maintain both their size and shape under the influence of forces
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Density Which is heavier, wood or iron? Amount of mass per unit volume Compressible - Density easily altered Incompressible - Density varies only slightly or not at all. Specific Gravity - ratio of the density of a material to that of water m V ρ = 2 H O 3 3 g kg 1 1000 cm m ρ = =
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Pressure The normal force per unit area that a fluid exerts on the walls of its container, adjacent fluids or other boundaries. Units: N/m 2 = 1 Pascal 1 Bar = 10 5 Pa 1 atm = 1.013 x 10 5 Pa 1 atm = 14.7 lb/in 2 1 atm = 760 Torr (mm Hg) F P A =
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Variation of pressure with height (depth) ( 29 G dF dm g gdV gAdy = = ρ = ρ r ( 29 PA P dP A gAdy 0 - + = dP g dy = -ρ
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Variation of pressure with height (depth) dP gdy = -ρ 2 2 1 1 P y P y dP gdy = - ρ ( 29 2 1 2 1 P P g y y - = -ρ - 0 P P gh = + ρ
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Problem 1 – What is the pressure at the faucet?
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This note was uploaded on 10/28/2009 for the course PHYS SP211 taught by Professor Idk during the Fall '08 term at Naval Academy.

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Chapter_14_Fluids-1 - Chapter 14 - Fluids Pressure...

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