ABSTRACT
Chapter 5 Momentum Equation presents the derivation of the momentum equation, which is based on the principles of fluid dynamics (conservation of momentum/Newton's second law of motion). The conservation of momentum is presented and applied in both the Eulerian (integral) and the Lagrangian (differential) approaches. The application of the governing equations (continuity, energy, and momentum) for real flow (internal), and ideal flow (flow-measuring devices for internal flow, and external flow around objects) requires the modeling of flow resistance (frictional losses). The flow resistance in internal and external flow (major head loss, minor head loss, actual discharge, and drag force) is modeled by a “subset level” application of the appropriate governing equations in Chapter 6.
