zMEEN 30123: FLUID
MECHANICS
by: Sir Garry Cahibaybayan
zIn this lesson we will:
Define fluid mechanics
Discuss mass, weight and pressure scale
Discuss density, specific volume, specific weight and specific gravity.
Discuss Viscosity( dynamic and kinematic viscosity)
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Introduction:
Fluid - any liquid or gas or generally any material that cannot sustain a
tangential, or shearing, force when at rest and that undergoes a continuous
change in shape when subjected to such a stress.
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Actual surface
Imaginary surface
A solid can resist shear stress
A solid can not resist shear stress
Bottom line: A fluid at rest cannot resist shear stress
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Dimension and System of Units
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In this lesson, we will:
Discuss the difference between dimensions and units
Demonstrate the proper way to do unit conversions using unity
conversion ratios.
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Dimension – (eg. Length)
Units – (eg. meter)
Unity Conversion Ratios:
Examples: ( 12in/ft) , (60s/min) , ( 1kg/ 2.20462)
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Example:
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Accuracy and Precision:
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z In this lesson, we will:
Define density and relative properties, specific
gravity and specific weight
Discuss how to calculate density when applying the
ideal gas approximation
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