Question

Which of the following represents the correct relation between dimensionless friction factor f and Reynolds number?

(a) f = 150* ((1-e) /R^2) + 1.75

(b) f = 150* ((1-e) /R) +1.75

(c) f = 150* ((1-e) /R^3) + 1.75

(d) f = 150* ((1-e^2) /R) + 1.75

The question was posed to me during a job interview.

This key question is from Filtration Hydraulics in division Filtration of Environmental Engineering

Answer 1

Right answer is (b) f = 150* ((1-e) /R) +1.75

The best I can explain: The correct relation between dimensionless friction factor and Reynolds number is given by f = 150* ((1-e) /R) + 1.75 Where R is the Reynolds number and the expression (1-e) represents the volume of solids.