15.3.3. Assumptions for Fluid Flow Problems

Try these first

1. 1.

   Define steady flow.

   Hint

   Think about how things would remain unchanged in the flow.

2. 2.

   What does incompressible flow imply?

   Hint

   Consider fluids like water.

3. 3.

   What is a characteristic of steady flow?

   • Properties change over time
   • Properties remain constant
   • Velocity varies drastically

   Hint

   Recall the definition of steady.

4. 4.

   True or False: In an incompressible flow, the density of fluid changes.

   • True
   • False

   Hint

   Think about which fluids can be considered incompressible.

5. 5.

   You have a water pipe system with an inlet having a diameter of 5 cm and an outlet of 3 cm. Given the flow is steady and incompressible, how does the velocity change as it moves through the pipe?

   Hint

   Remember: Area increases with area decreases for an incompressible fluid.

6. 6.

   Analyze a scenario where the control volume is deformable while discussing how you would manage integrating velocity changes over time.

   Hint

   Think of how you can simplify this by focusing on small parts rather than treating the entire volume at once.