IntroFluids

# IntroFluids - CEVE 101 Introduction to Fluid Mechanics Dr....

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Introduction to Fluid Mechanics Introduction to Fluid Mechanics Dr. Bedient Dr. Bedient Civil and Environmental Engineering Civil and Environmental Engineering CEVE 101

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Fluids: Fluids: Statics vs Dynamics Statics vs Dynamics
Atmospheric Pressure Atmospheric Pressure Pressure = Force per Unit Area Atmospheric Pressure is the weight of the column of air above a unit area. For example, the atmospheric pressure felt by a man is the weight of the column of air above his body divided by the area the air is resting on P = (Weight of column)/(Area of base) Standard Atmospheric Pressure : 1 atmosphere (atm) 14.7 lbs/in 2 (psi) 760 Torr (mm Hg) 1013.25 millibars = 101.3 kPascals 1kPa = 1Nt/m 2

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Fluid Statics Fluid Statics Basic Principles : Fluid is at rest : no shear forces Pressure is the only force acting What are the forces acting on the block? Air pressure on the surface - neglect Weight of the water above the block Pressure only a function of depth
Units Units SI - International System Length Meter Time Sec Mass Kg Temp 0 K = 0 C + 273.15 Force Newton = Nt = 1 kg m / s 2 Gravity 9.81 m/s 2 Work = Fxd Joule = Nt-m Power = F/t Watt = Joule/sec

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Units Units English Length in Ft Time in Sec lbm (slug) - 1 slug = 32.2 lbm Force - lb Gravity - 32.2 ft/sec 2 Work = slug-ft/s 2
Properties of Fluids Properties of Fluids Density = ρ (decreases with rise in T) mass per unit volume ( lbs/ft 3 or kg/m 3 ) for water density = 1.94 slugs/ft 3 or 1000 kg/m 3 Specific Weight = γ (Heaviness of fluid ) weight per unit volume γ = ρ g for water spec wt = 62.4 lbs/ft 3 or 9.81 kN/m 3 Specific Gravity = SG Ratio of the density of a fluid to the density of water SG = ρ f / ρ w SG of Hg = 13.55

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Ideal Gas Law relates pressure to Temp for a gas P = ρ RT T in 0 K units R = 287 Joule / Kg- 0 K Pressure
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IntroFluids - CEVE 101 Introduction to Fluid Mechanics Dr....

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