Explain how the density of the fluid affects the flow as laminar or turbulent?

A.

Increased density –> Increased probability of turbulence

B.

Increased density –> Decreased probability of turbulence

C.

Decreased density –> Increased probability of turbulence

D.

Normal density –> Decreased probability of turbulence

Show Answer

Correct Answer � A

Explanation

Ans. A. Increased density –> Increased probability of turbulence.

Reynold’s number (R e ) determines whether flow in a tube will be laminar or turbulent:

R_{e} = vD∂ / η,

v is velocity,

D is the diameter of the tube

∂ is the density of the fluid

η is the viscosity of the fluid.

Assuming other variables are held constant, increased velocity, tube diameter, and density of fluid are associated with a greater likelihood of turbulence; increased viscosity is associated with a greater likelihood of laminar flow.