Question

Motion of a liquid in a tube is best described by ___________

(a) Bernoulli theorem

(b) Poiseuille’s equation

(c) Stoke’s law

(d) Archimedes’ principle

The question was posed to me during an interview.

I want to ask this question from Streamline and Turbulent Flow in portion Thermal Properties of Matter of Engineering Physics I

Answer 1

Right choice is (b) Poiseuille’s equation

Easiest explanation: Poiseuille’s formula gives the volume of a liquid flowing out per second through a horizontal capillary tube of length l, radius r, under a pressure difference p applied across its ends.

Q=V/t=(πpr^4)/8Ƞl.