Reynolds Number Regimes
Laminar / transitional / turbulent flow boundaries with Re thresholds.
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flowchart LR
Re[Reynolds number\nRe = ρvL/μ] --> Lam{Re < 2,300?}
Lam -- yes --> L[Laminar\nparallel streamlines]
Lam -- no --> T1{Re < 4,000?}
T1 -- yes --> Tr[Transitional\nintermittent eddies]
T1 -- no --> Tu[Turbulent\nchaotic, mixing]
L --> Eq[friction factor f = 64/Re]
Tu --> Eq2[Colebrook / Moody chart]