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Fluid Mechanics for Chemical Engineers: with Microfluidics, CFD, and COMSOL Multiphysics 5, 3rd Edition by Conrad Carlberg

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Chapter 2. Mass, Energy, And Momentum Balances

2.1 General Conservation Laws

THE study of fluid mechanics is based, to a large extent, on the conservation laws of three extensive quantities:

1. Mass—usually total, but sometimes of one or more individual chemical species.

2. Total energy—the sum of internal, kinetic, potential, and pressure energy.

3. Momentum, both linear and angular.

For a system viewed as a whole, conservation means that there is no net gain nor loss of any of these three quantities, even though there may be some redistribution of them within a system. A general conservation law can be phrased relative to the general system shown in Fig. 2.1, in which can be identified:

Fig. 2.1. (a) System and its surroundings; (b) transfers ...

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