4. Boundary Types in Turbulent Flow

Try these first

1. 1.

   Define turbulent flow.

   Hint

   Think about what happens when a river flows rapidly.

2. 2.

   What is shear stress at the wall denoted as?

   Hint

   Remember the symbol often used in physics for this force type.

3. 3.

   What characterizes turbulent flow?

   • A smooth
   • steady flow
   • Chaotic changes in flow properties
   • Linear variation of velocity

   Hint

   Remember how a lot of currents interact in a fast-moving stream.

4. 4.

   True or False: The viscous sublayer is where velocity changes significantly.

   • True
   • False

   Hint

   Consider what happens right next to the wall.

5. 5.

   A pipe with a diameter of 15 cm has surface irregularities of height 0.3 mm. The viscous sublayer thickness is 2 mm. Classify the boundary type.

   Hint

   Ratio calculations are key to solving this.

6. 6.

   A turbulent flow scenario has u_max = 5 m/s at the centerline. If the parameter u* is calculated to be 0.5 m/s, and y is 0.1 m, determine the velocity at this y position.

   Hint

   Ensure to convert the units to SI throughout the calculation.