## Laminar and Turbulent flow-1

**Introduction: In some special cases,**

When the flow is uniformly distributed over the opening of the control surface (one-dimensional flow), the expression for mass flow rate is given by,

Where p is the fluid density, Q is the volume flow arte and V is the component of fluid velocity perpendicular to area A. In case, the density changes (as in the case of compressible flows), the average value of the component of velocity normal to the area is considered and is defined as,

When the flow is steady, the time rate of change of the mass of contents in the CV is zero, so that

For steady flow involving only one stream of specific fluid flowing through the CV at section (1) and (2)

In case of incompressible flow, is constant. So,