Lecture 18 Notes - EGN 3353C Fluid Mechanics Lecture 18...

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EGN 3353C Fluid Mechanics Lou Cattafesta MAE Dept. University of Florida Lecture 18 Bernoulli’s Equation: Limitations and Applications ± Last time, we derived the steady form of Bernoulli’s Equation along a streamline N N N 2 static hydrostatic total pressure pressure pressure q = dynamic pressure 1 2 t p Vg z P ρρ ++ = ±²³ Æ total pressure form (1) o static pressure p = is the thermodynamic pressure o if there is no flow, we have a static fluid and p gz ρ + is the absolute pressure one would measure at a point in a static fluid o dynamic pressure q = is the kinetic energy per unit volume of a fluid element in motion ± divide (1) by to get the energy/mass form N N N N 2 different constant PE/mass for each streamline KE/mass flow energy/mass 1 2 p z C ++= ± divide (1) by g density to get the head form N N N N 2 elevation total head head Pressure velocity head head 2 pV zH gg + += ± Latter is often plotted in graphical form (civil engineering)
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EGN 3353C Fluid Mechanics Lou Cattafesta MAE Dept. University of Florida o line that represents p gz ρ + is called the ( ) hydraulic grade line HGL o line that represents H is called the ( ) energy grade line EGL , which is always above the HGL by a distance 2 2 Vg ± Restrictions are 1.
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This note was uploaded on 08/17/2011 for the course EGN 3353C taught by Professor Lear during the Spring '07 term at University of Florida.

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Lecture 18 Notes - EGN 3353C Fluid Mechanics Lecture 18...

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