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FluidCalc
The dimensionless number that predicts whether fluid flow stays smooth (laminar) or becomes chaotic (turbulent).
Re below ~2,300 indicates laminar flow (smooth, predictable layers); above ~4,000 is turbulent (chaotic mixing); between is the transition zone. This single number captures the ratio of inertial forces to viscous forces and is one of the most important parameters in fluid mechanics.
Laminar and turbulent flows have completely different friction, heat transfer, and mixing characteristics. A pipe designed for laminar flow will have dramatically different pressure drops than one operating in turbulent flow — getting the Reynolds number right is the first step in any fluid system design.
Reynolds number
100,000
Re = ρvD/μ
What you entered
Re = ρvD/μ
1000 × 2 × 0.05 / 0.001= 100000Flow regime (<2300 laminar, 2300–4000 transitional, >4000 turbulent)
Re = 100000= TurbulentResult
Reynolds number: 100,000
Re = 100,000 — the flow is turbulent.