CE361 - Lecture 04

CE361 - Lecture 04 - 1/22/2009 Water Resources Engineering...

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1/22/2009 1 Water Resources 1 Engineering -Lecture±4 Dr. Thorsten Wagener Penn State University Chapter 3 Flow Processes and Hydrostatic Forces 2
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1/22/2009 2 Content 1. Energy 3 Energy We can use the first law of thermodynamics in combination with the control volume 4 in combination with the control volume approach to develop the energy equation for fluid flow in hydrologic/hydraulic processes.
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1/22/2009 3 Energy 5 First Law of Thermodynamics An energy balance for hydrosystem processes accounts for all inputs and outputs of energy to and from the system. The first law of thermodynamics for a system is The for a system is, dE dH dW dt dt dt =− 6 Rate of change of energy = Rate of heat transferred into fluid Rate of work fluid does on surrounding -
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1/22/2009 4 Definitions The work transfer rate, W , is positive when work is done on the contents of the control volume by 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 7 control volume (CV) and surroundings because of temperature differences. Heat transfer into the
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CE361 - Lecture 04 - 1/22/2009 Water Resources Engineering...

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