Question

The nature of the boundary layer depends on _____________

(a) Mach number

(b) Inertia force

(c) Reynold’s number

(d) Viscosity

The question was asked in an interview for job.

I'd like to ask this question from Circulation topic in division Aerodynamics – Fundamental Principles and Equations of Aerodynamics

Answer 1

The correct answer is (c) Reynold’s number

The best explanation: The nature of the boundary layer depends on Reynold’s number which is the ratio of inertial force to viscous force. Depending on the value of Reynold’s number, the boundary layer may be laminar (the flow is continuous) or it may be turbulent ( the flow is discontinuous).