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Pipe Reynolds Number

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Formula, assumptions, and limits

Re=ρVDμ\text{Re} = \frac{\rho \cdot V \cdot D}{\mu}
SymbolMeaningUnit
ρρFluid densitykg/m³
VVAverage velocitym/s
DDPipe internal diameterm (mm/1000)
μμDynamic viscosityPa·s (cP/1000)

Source: White - Fluid Mechanics

In short

Re = \u03c1\u00b7V\u00b7D/\u03bc for an internal pipe flow.

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