bulk modulus and fluid elasticity
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Bulk Modulus and Fluid ElasticityIntroduction and definition of Bulk Modulus Elasticity - commonly used to characterizecompressibility of fluids
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The Bulk Modulus Elasticity is a material property characterizing the compressibility of a fluid - how easy a unit ofthe fluid volume can be changed when changing the pressure working upon it.
The Bulk Modulus Elasticity can be expressed as
E = - dp / (dV / V) (1)
where
E = bulk modulus elasticity
dp = differential change in pressure on the object
dV = differential change in volume of the object
V = initial volume of the object
The Bulk Modulus Elasticity can be alternatively expressed as
E = dp / (dρ / ρ) (2)
where
dρ = differential change in density of the object
ρ = initial density of the object
An increase in the pressure will decrease the volume (1). A decrease in the volume will increase the density (2).
The SI unit of the bulk modulus elasticity is N/m2 (Pa)
The imperial (BG) unit is lbf/in2 (psi)
1 lbf/in2 (psi) = 6.894 103 N/m2 (Pa)
A large Bulk Modulus indicate a relative incompressible fluid.
Bulk Modulus for some common fluids can be found in the table below:
Bulk Modulus - EImperial Units - BG
(105 psi, lbf/in2)
SI Units
(109 Pa, N/m2)
Acetone 1.34 0.92
Benzene 1.5 1.05
Carbon Tetrachloride 1.91 1.32
Ethyl Alcohol 1.54 1.06
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Bulk Modulus - EImperial Units - BG
(105 psi, lbf/in2)
SI Units
(109 Pa, N/m2)
Gasoline 1.9 1.3
Glycerin 6.31 4.35
Kerosene 1.9 1.3
Mercury 41.4 28.5
Paraffin Oil 2.41 1.66
Petrol 1.55 - 2.16 1.07 - 1.49
SAE 30 Oil 2.2 1.5
Seawater 3.39 2.34
Sulfuric Acid 4.3 3.0
Water 3.12 2.15
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Related Topics
Fluid Mechanics - The study of fluids - liquids and gases. Involves various properties of the fluid, such asvelocity, pressure, density and temperature, as functions of space and time.Material Properties - Material properties - density, heat capacity, viscosity and more - for gases, fluidsand solids
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