Question

With the increase in flow velocity, Reynolds number_________

(a) Increases

(b) Decreases

(c) Same

(d) Independent

I have been asked this question in an international level competition.

The query is from Drag on a Sphere in section Boundary Layer Flow & Forces on Sub-merged Bodies of Fluid Mechanics

Answer 1

Correct answer is (a) Increases

For explanation: With the increase in flow velocity, Reynolds number increases. Reynolds number below 2000 is laminar flow and Reynolds number above 2000 is for turbulent flow. Thus, the correct option is Increases.