2.8. OVERALL MOMENTUM BALANCE

2.8A. Derivation of General Equation

A momentum balance can be written for the control volume shown in Fig. 2.6-3 which is somewhat similar to the overall mass-balance equation. Momentum, in contrast to mass and energy, is a vector quantity. The total linear momentum vector P of the total mass M of a moving fluid having a velocity of v is

Equation 2.8-1

The term Mv is the momentum of this moving mass M enclosed at a particular instant in the control volume shown in Fig. 2.6-4. The units of are kg · m/s in the SI system.

Starting with Newton's second law, we will develop the integral momentum-balance equation for ...

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