Assumptions

1. A stream tube with no cross flow considered.
2. The flow is steady ${\partial \over {\partial t}}=0$
3. Fluid is incompressible ( =constant).

It is necessary to note that any application of the momentum equation should be preceded by the Continuity Equation. We cannot obtain complete information about the flow by applying momentum equation alone.

(c) Aerospace, Mechanical & Mechatronic Engg. 2005
University of Sydney