CVEN 3313 Chapter Notes - Chapter 5: Angular Velocity, Right-Hand Rule, Turbulence
26 Mar 2017
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Section 5. 02 newton"s second law-the linear momentum and moment-of-momentum equations. Newton"s second law of motion for a system is states by the time rate of change of the linear momentum of a system is equal to the sum of external forces acting on the system. Forces acting on a flowing fluid can change its velocity magnitude and/or direction. For a control volume, newton"s second law of motion is shown below by the linear momentum equation: in the linear momentum equation, it"s usually fixed, nondeforming control volumes. The linear momentum equation for an inertial control volume is a vector equation, as see above. Down below is a diagram of a control volume. Momentum flux in nonuniform flow can be evaluated using average velocity and momentum coefficient. Momentum flux can be written as: for a laminar flow, beta is 4/3, for a turbulent flow in a pipe beta is approximately 1. 02, and for a uniform flow, beta is 1.
