1. Introduction to Turbulent Flow

Try these first

1. 1.

   What is shear stress in the context of turbulent flow?

   Hint

   Think about forces acting along the surface.

2. 2.

   What characterizes turbulent flow?

   Hint

   Consider how the flow differs from smooth, laminar flow.

3. 3.

   What is turbulent flow characterized by?

   • Smooth flow
   • Chaotic fluctuations
   • Constant velocity

   Hint

   What differs from laminar flow?

4. 4.

   True or False: The sheer stress at the wall (τ₀) changes with varying flow conditions.

   • True
   • False

   Hint

   Consider the definition of τ₀ at the wall.

5. 5.

   A pipe with a diameter of 20 cm carries water at a speed of 5 m/s. Through some adjustments, the shear stress at the wall drops. Calculate the new speed if the shear stress doubles.

   Hint

   Consider how changes in shear stress impact velocity.

6. 6.

   A surface shows a significant height of irregularities (k). If k = 0.2 mm and δ (viscous sublayer) = 0.5 mm, is it a smooth, transitional, or rough boundary? Calculate and explain.

   Hint

   Refer to the definitions of boundary classification.