Imagine That You Are Working at an Outback Mine

Multiple Choice

Imagine that you are working at an outback mine. In part of the on-sight mineral separation plant, a slurry consisting of a mixture of mineral dust and water flows from one part of the plant to another down a pipe of diameter 10 cm. The flow needs to remain turbulent, as otherwise the mineral dust will settle to the bottom of the pipe and block it. If the density of the flurry is 2000 km m-3 and its viscosity is 0.001 Pa s, what is the minimum velocity the slurry must flow at to ensure it remains turbulent?

A) 2.0 cm s-1.
B) 4.0 cm s-1.
C) 6.0 cm s-1.
D) 12.0 cm s-1.
E) 24.0 cm s-1.ANS