Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time’t’. α = a co-efficient to be experimentally determined) ?

Question

Accepted Answer

ε = ε0 + α.t. The equation suggested by Colebrook and White for the increase in roughness is linear with time. This means the change is proportional to time (t).