| Explanation: The given box represents a fixed control volume, with an inlet and an outlet for a flowing fluid. The amount of fluid entering is more than the fluid leaving.Hence there is an accumulation of fluid inside the control volume.
Rate at which mass enters = Rate at which mass leaves the region + Rate of accumulation of mass in the region
OR
Rate of accumulation of mass in the control volume + Net rate of mass efflux from the control volume = 0 |
