20.6.2. Flow Classifications and Control Volumes

Try these first

1. 1.

   What is a control volume?

   Hint

   Think about where we observe fluid behavior.

2. 2.

   Name two types of control volumes.

   Hint

   Consider whether the control volume changes position.

3. 3.

   What is the difference between steady and unsteady flow?

   • Steady: constant conditions; Unsteady: changing conditions
   • Steady: changing conditions; Unsteady: constant conditions
   • Steady: no flow; Unsteady: flow

   Hint

   Think about whether conditions stay the same or change over time!

4. 4.

   True or False: Body forces are applied at the surface of a control volume.

   • True
   • False

   Hint

   Consider the nature of forces acting within a fluid context.

5. 5.

   Create a comprehensive analysis of forces acting on a bridge due to flow changes caused by a flood, using both steady and unsteady flow approaches.

   Hint

   Think about the implications of shifting water levels and their effects on the bridge.

6. 6.

   Derive expression for momentum flux correction factor in a pipe flow with varying velocity profile and discuss its engineering significance.

   Hint

   Recall integrating over cross-sectional areas to determine average quantities.