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:
Re = 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.
