Question

How can we determine whether the flow is laminar or turbulent?

(a) Reynold’s number

(b) Mach number

(c) Froude number

(d) Knudsen number

I got this question by my college director while I was bunking the class.

My doubt is from Separation of Boundary Layer in portion Boundary Layer Flow & Forces on Sub-merged Bodies of Fluid Mechanics

Answer 1

Correct choice is (a) Reynold’s number

For explanation I would say: Reynold’s number is used to determine whether the flow is laminar or turbulent. If Reynold’s number is less than 2000, it is a laminar flow. If Reynold’s number is greater than 2000, then it is a turbulent flow.