Chapter14

# Chapter14 - Chapter 14 Fluid Mechanics 1 Density Fluid A...

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Chapter 14: Fluid Mechanics

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1. Density Fluid: A substance that can flow and conform to the shape of a container. Liquids and gases are fluids. Density : mass per unit volume, unit: kg/m 3 For water at 4 ° C, ρ =1000 kg/m 3 =1 g/cm 3 Originally, g/cm 3 was used. The reason for water’s density being 1. For mercury (Hg), 13.6 × 10 3 kg/m 3 Specific gravity : the ratio of material’s density to the density of water. For mercury, specific gravity is 13.6 M V ρ=

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2. Pressure in a Fluid Pressure : the normal force per unit area Unit : Pa (pascal)=N/m 2 Atmospheric pressure 1 atm=1.013 × 10 5 Pa = 1.013 bar =1013 mbar =1013 hPa dF p dA =
Pressure and depth The pressure is the same at any two points at the same level in the fluid. 2 1 2 1 ( ) p p g y y ρ - = - - 0 p p gh = +

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Pascal’s Law : Pressure in a confined fluid is transmitted unchanged to all parts of the fluid and to the containing walls. 1 2 1 2 F F p A A = =
Mercury barometer 1 atm=760 mmHg=760 Torr Gauge pressure : excessive pressure above the atmospheric pressure gauge pressure = absolute pressure (total pressure) - atmospheric pressure 0 a p gh ρ = +

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3. Buoyancy
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Chapter14 - Chapter 14 Fluid Mechanics 1 Density Fluid A...

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