20.6. Practical Applications

Try these first

1. 1.

   What is the main principle behind the conservation of momentum?

   Hint

   Think about how momentum behaves in collisions.

2. 2.

   Define a control volume in fluid mechanics.

   Hint

   What do we analyze within a defined space?

3. 3.

   What is the basis of the conservation of momentum?

   • Momentum can change with external forces
   • Momentum remains constant in an isolated system
   • Momentum increases in a flowing system

   Hint

   Think about how collisions behave in physics.

4. 4.

   True or False: A control volume is always a physical boundary.

   • True
   • False

   Hint

   Consider the purpose of control volumes in fluid dynamics.

5. 5.

   Calculate the forces acting on a control volume with inflows of 100 kg/s and 50 kg/s, with an outflow of 120 kg/s. Assume gravity acts downwards with an appropriate force.

   Hint

   Remember to account for both inflow and outflow when using momentum equations.

6. 6.

   Given a turbulent two-dimensional flow causing pressure variations around a structure, determine how momentum coefficients would vary with flow velocity changes.

   Hint

   Use flow visualization tools to predict how pressure distribution might change with turbulent flows.