Question

In a turbulent flow, the velocity of the liquid in contact with the walls of the tube is:

• A. zero
• B. maximum
• C. equal to average velocity
• D. equal to critical velocity

Hint:

Critical velocity is the boundary between laminar (streamline) and turbulent flow.

Answer 1

The Correct Option is D

Step 1: Concept
Flow becomes turbulent when the velocity exceeds a certain limit known as critical velocity.
Step 2: Analysis
In streamline flow, the velocity at the walls is zero. However, in turbulent flow, the behavior changes.
Step 3: Conclusion
For turbulent flow, the velocity of the liquid in contact with the walls is equal to the critical velocity.
Final Answer: (D)