Reynolds Number formula:
NR = ρ * v * D / η
where:
NR: Reynolds Number, dimensionless
ρ: Fluid Density, in Kg/m^3
v: Fluid Speed (velocity), in meter/second
D: Pipe Diameter (travelled length of the fluid; hydraulic diameter in river system), in meter
η: Fluid Viscosity, in N.s/m^2
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