Viscosity of flowing fluid for laminar flow - Fluid Mechanics

Q.  How should be the viscosity of the flowing fluid for laminar flow?
- Published on 04 Aug 15

a. viscosity of the fluid should be as low as possible, for laminar flow
b. viscosity of the fluid should be as high as possible, for laminar flow
c. change in viscosity of the flowing fluid does not affect its flow
d. unpredictable

ANSWER: viscosity of the fluid should be as high as possible, for laminar flow

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    Discussion

  • Pankaj   -Posted on 29 Sep 15
    In laminar flow, there is no microscopic mixture of adjacent layers of fluid. All the fluid particles have an orderly motion and moves in a straight line parallel to the pipe wall through which fluid is flowing. At low velocities, fluid flows without lateral mixing.

    Reynold's number for laminar flow is less than 2000. Also the Reynold's number is less than 2000 for viscous fluids. Therefore, viscosity of the flowing fluid should be as high as possible for laminar flow.

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