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Reynolds Number This is a non-dimensional number (consistent units) which describes whether fluid flow is laminar, turbulent, or transitional between the two. It is significant in the design of a model of any system in which the effect of viscosity is important in controlling the velocities or the flow pattern of a fluid.  - where
- Re = Reynolds Number
- ρ = density [kgm-3]
- U = characteristic velocity [ms-1]
- L = characteristic length scale [m]
- η = dynamic viscosity [Nsm-2]
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Note: - Re < 2000 – laminar flow.
- 2000 < Re < 3000 – unstable flow.
- Re > 3000 – turbulent flow.
See also: Froude Number, Poise, Scale Effect, Strouhal Number.
  
Subjects:- Mechanical Engineering
- Physics
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