Question

What is viscous dissipation?

(a) Loss of kinetic energy due to viscous effect

(b) Loss of potential energy due to viscous effect

(c) Increase in kinetic energy due to increase in temperature

(d) Frictional drag

I had been asked this question in an interview.

I'm obligated to ask this question of Hypersonic Flow in portion Transonic and Hypersonic Flows of Aerodynamics

Answer 1

Right option is (a) Loss of kinetic energy due to viscous effect

Easiest explanation: When a very high velocity flow is over a body, the hypersonic flow has large amounts of kinetic energy. This is often dissipated and converted in the form of internal energy die to viscous effects within the boundary layer. This effect is known as the viscous effect.