Question

The rate of change of velocity per unit distance normal to a section is called_______

(a) Mean velocity

(b) Average velocity

(c) Mean velocity gradient

(d) Velocity gradient

I had been asked this question in my homework.

My enquiry is from Flocculation and Clarification topic in section Sedimentation of Environmental Engineering

Answer 1

Correct answer is (c) Mean velocity gradient

For explanation I would say: Mean velocity gradient is given by G = (P/uv)^1/2 Where P = power dissipated, u = absolute viscosity, v = volume to which power is applied.