+1 vote
in Fluid Mechanics by (118k points)
Three flows named as 1,2 and 3 are observed. The Reynold’s number for the three are 100, 1000 and 10000. Which of the flows will be laminar?

(a) only 1

(b) only 1 and 2

(c) 1, 2 and 3

(d) only 3

The question was asked by my college professor while I was bunking the class.

My enquiry is from Types of Fluid Flow in section Kinematics of Flow and Ideal Flow of Fluid Mechanics

1 Answer

+2 votes
by (362k points)
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Best answer
Correct option is (b) only 1 and 2

Easy explanation: Flows can be characterized as laminar or turbulent on the basis of Reynold’s number Re = ρvd / μ, where ρ is the density, d is the pipe diameter and μ is the viscosity. For Re < 2000, the flow will be laminar and Re > 4000, the flow will be turbulent. Thus, flow 1 and 2 will be laminar.

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