Question

When the Reynolds number is greater than 1.9 but less than 500, the coefficient of drag CD is?

(a) CD = 24/R

(b) CD = R/24

(c) CD = 18.5/R^0.6

(d) CD = R^0.6/18.5

The question was posed to me in homework.

Query is from Filtration Hydraulics topic in section Filtration of Environmental Engineering

Answer 1

Correct answer is (c) CD = 18.5/R^0.6

For explanation: When the Reynolds number is greater than 1.9 but less than 500, the coefficient of drag CD is CD = 18.5/R^0.6 where R is the Reynolds number.