nserv2 - Fluid Properties (Macroscopic) The primary fluid...

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Fluid Properties acroscopic) (Macroscopic)
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The primary fluid properties (variables) are its: Density Pressure elocity Velocity Temperature Viscosity
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Fluid properties are classified as: Intensive and Extensive
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Properties that are independent of the amount of fluid are called intensive properties, and usually designed by lower case letters such as: Mass density; ρ ressure; Pressure; p Velocity; v Viscosity; μ Specific volume; υ Specific heats; c p ,c υ Specific internal energy; u Specific enthalpy; h
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Properties related to the total mass of the system are called extensive properties, and are usually represented by capital letters, for example: ass; Mass; M Weight; W
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Fluid as a Continuum
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From a microscopic viewpoint, a material substance is composed of discrete molecules or atoms. However, it is not possible to study the behavior f these discrete particles when trying to of these discrete particles when trying to describe the properties of fluids at rest or in motion.
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The continuum postulate assumes that a differential fluid element contains a tremendous number of molecules and that the average statistical properties of the molecules contained in an elementary volume represent the acroscopic properties of the fluid macroscopic properties of the fluid .
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Under normal conditions of pressure and temperature, a gas molecule moves only a short distance, called molecular free path , before it collides with another gas molecule. he average value of the free path is termed The average value of the free path is termed the mean free path , denoted by l . l is larger for small molecules than for large molecules
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mean free path must be small compare to a linear dimension L (e.g. height of container, diameter of pipe) pertinent to the flowfield . y definition, the ratio L termed the nudsen By definition, the ratio l/L is termed the Knudsen number, Kn . Kn<0.01
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This note was uploaded on 03/19/2011 for the course AEE 300 taught by Professor Beşyüz during the Spring '11 term at Middle East Technical University.

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nserv2 - Fluid Properties (Macroscopic) The primary fluid...

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