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eng.fluid-reynolds Calculator
Calculates the Reynolds number (Re = ρVD/μ) and determines laminar, transitional, or turbulent flow regime for pipe or external flow. Reynolds number is the most important dimensionless number in fluid mechanics — it governs whether friction losses are linear (laminar) or quadratic (turbulent) with velocity.
Inputs
Rho
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
V
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
D
Internal diameter of the pipe. Larger diameter reduces velocity and pressure drop but increases material cost.
Mu
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.
critical at
The value at the specified point or condition.
Re
Reference formula or conversion factor shown for context.