Lecture 4 - Water Resources Engineering - Lecture 4 1...

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ater Water esources Resources ngineering Prepared by T. Wagener & P. Reed enn State University Engineering - ecture 4 Penn State University 1 Lecture 4
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Chapter 3 Flow Processes and Hydrostatic Forces 2
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ontent Content nergy 1. Energy 3
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nergy Energy We can use the first law of thermodynamics in combination with the control volume pproach develop the energy equation for approach to develop the energy equation for fluid flow in hydrologic/hydraulic processes. 4
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nergy Energy 5
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irst Law of Thermodynamics First Law of Thermodynamics An energy balance for hydrosystem processes accounts for all inputs and outputs of energy to and from the system. pp g y y The first law of thermodynamics for a system is, dE dH dW = dt dt dt Rate of change of energy = Rate of heat transferred to fluid Rate of work fluid does on urrounding - 6 into fluid surrounding
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efinitions Definitions he work transfer rate, is positive when work is The work transfer rate, W , is positive when work is done on the contents of the control volume by the surroundings. Otherwise it is considered negative. The heat transfer rate, H , represents all the ways in which energy is exchanged between the control volume (CV) and surroundings because f temperature differences Heat transfer into the of temperature differences. Heat transfer into the CV is considered positive, heat transfer out is egative 7 negative.
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otal Energy of a Fluid System Total Energy of a Fluid System uk p EE E E = ++ Total energy = Internal energy Kinetic energy + Potential energy + 8
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emember the Reynolds Transp. Thm. Remember the Reynolds Transp. Thm.
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This note was uploaded on 04/11/2008 for the course C E 361 taught by Professor Reed,patrickmichwalters,geoffrey during the Spring '07 term at Pennsylvania State University, University Park.

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Lecture 4 - Water Resources Engineering - Lecture 4 1...

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