14.. Fluid Flow Dynamics

Try these first

1. 1.

   What does viscosity measure?

   Hint

   Think about how syrup flows compared to water.

2. 2.

   What does the Reynolds number compare?

   Hint

   Remember how it helps determine flow types.

3. 3.

   What does viscosity influence?

   • Only the surface tension
   • Fluid's resistance to flow
   • The weight of the fluid

   Hint

   Think of thick versus thin liquids.

4. 4.

   True or False: The Reynolds number is used to compare inertial forces to gravitational forces.

   • True
   • False

   Hint

   Remember the role of viscosity!

5. 5.

   A fluid has a density of 1000 kg/m³ and a dynamic viscosity of 0.001 Pa.s. Calculate the Reynolds number for a pipe with a diameter of 0.05 m and a fluid velocity of 2 m/s. Discuss whether the flow is laminar or turbulent.

   Hint

   Use the Reynolds number formula to perform your calculations.

6. 6.

   In an open channel flow with an average flow depth of 0.5 m and a velocity of 3 m/s, calculate the Froude number. Discuss the implications of the result on flow classification.

   Hint

   Recalling the definition of the Froude number will help you calculate.