Question

Which of the following flow is practically impossible in nature?

(a) viscous flow

(b) inviscid flow

(c) laminar flow

(d) turbulent flow

The question was posed to me during an online exam.

I'm obligated to ask this question of Finite Control Volume Approach in section Aerodynamics – Fundamental Principles and Equations of Aerodynamics

Answer 1

Right answer is (b) inviscid flow

The best I can explain: The flow without friction, thermal conduction, or diffusion is practically impossible. During any process or flow, the energy losses take place which leads to frictional losses, thermal losses, diffusion and various other losses.