Question

The Reynolds number for fluid flow in a pipe is independent of

• A. the viscosity of the fluid
• B. the velocity of the fluid
• C. the length of the pipe
• D. the diameter of the pipe

Hint:

The Reynolds number is a dimensionless quantity that helps predict flow patterns in fluid dynamics. It is independent of the length of the pipe.

Answer 1

The Correct Option is C

The Reynolds number is given by the equation:

\[ Re = \frac{\rho v D}{\mu} \] where \( \rho \) is the density of the fluid, \( v \) is the velocity of the fluid, \( D \) is the diameter of the pipe, and \( \mu \) is the dynamic viscosity of the fluid.

As seen from the formula, the Reynolds number depends on the velocity of the fluid, the diameter of the pipe, and the viscosity of the fluid, but it is independent of the length of the pipe.

Hence, the correct answer is (c).