Question

Critical velocity of the liquid ___________

(a) Decrease when radius decreases

(b) Increases when radius increases

(c) Decreased when density increases

(d) Increases when density increases

The question was asked during an online exam.

This interesting question is from Streamline and Turbulent Flow topic in division Thermal Properties of Matter of Engineering Physics I

Answer 1

Right answer is (c) Decreased when density increases

Explanation: vc=(Re Ƞ)/pD

Critically velocity decreases when density ρ increases or diameter D increases.