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sci.Reynolds-number-flow-regime Calculator
Calculates Reynolds number Re = ρvD/μ for pipe or external flow and classifies flow regime (laminar < 2,300, transitional 2,300–4,000, turbulent > 4,000). In turbulent pipe flow, friction factor is given by the Colebrook equation — turbulent Re can reach 10⁷ in large industrial pipelines.
Inputs
Rho Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
V M S
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
L M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Mu Mpas
Fluid resistance to flow. Water at 20°C: ~1 cP. Honey: 2,000–10,000 cP. Higher viscosity increases pumping power requirements.
Whether the flow is laminar (smooth, ordered) or turbulent (chaotic). Determined by the Reynolds number: below 2,300 = laminar; above 4,000 = turbulent.
CD sphere (Stokes/intermediate/Newton)
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).
Re = ρvL/μ
Reference formula or conversion factor shown for context.
pipe flow
Reference formula or conversion factor shown for context.