15.4.1. Steady and Compressible Flow

Try these first

1. 1.

   Define a control volume.

   Hint

   Think about how engineers analyze flow in systems.

2. 2.

   What does the conservation of mass state?

   Hint

   Recall what you learned about matter in a closed system.

3. 3.

   What does the conservation of mass state in fluid mechanics?

   • Mass can be created
   • Mass can be destroyed
   • Mass is constant in a closed system

   Hint

   Recall the law of mass balance.

4. 4.

   Is the following statement true or false? 'In steady flow, mass entering a system equals mass exiting.'

   • True
   • False

   Hint

   Think about the balance of water in a bucket.

5. 5.

   A tank has water flowing in at a rate of 5 L/min while water flows out at a rate of 3 L/min. Determine the change in the tank's mass flow considering it starts at 100 L. What happens over time?

   Hint

   Set up a mass balance using inflow and outflow rates.

6. 6.

   In a moving control volume like a submarine, the pressure changes due to the movement forward through water. Explain how conservation of mass is maintained in this scenario.

   Hint

   Consider how the submarine's speed affects the water pressure and flow rates.