Question

Is interface between the solid and fluid, shear stresses develop as the solid attempts to slow down the fluid flowing?

(a) True

(b) False

The question was posed to me by my school principal while I was bunking the class.

This intriguing question comes from Viscous Flow topic in division Incompressible Flow over Airfoils of Aerodynamics

Answer 1

Right choice is (a) True

To explain I would say: The interface between the solid and fluid, shear stresses develop as the solid attempt’s to slow down the fluid flowing over it. This shear stress gives rise to a skin friction drag. It is proportional to the product of a quantity called viscosity.