Example - Calculate Reynolds NumberĪ Newtonian fluid with a dynamic or absolute viscosity of 0.38 Ns/m 2 and a specific gravity of 0.91 flows through a 25 mm diameter pipe with a velocity of 2.6 m/s. In practice laminar flow is only actual for viscous fluids - like crude oil, fuel oil and other oils. The Reynolds Number can be used to determine if flow is laminar, transient or turbulent. Ν = kinematic viscosity (cSt) (1 cSt = 10 -6 m 2 /s ) ![]() The Reynolds number for a pipe or duct expressed in Imperial units ![]() The Reynolds Number for the flow in a duct or pipe can with the hydraulic diameter be expressed asĭ h = hydraulic diameter (m, ft) Reynolds Number for a Pipe or Duct in Imperial Units Ν = μ / ρ = kinematic viscosity (m 2 /s, ft 2 /s) Reynolds Number for Flow in Pipe or Ductįor a pipe or duct the characteristic length is the hydraulic diameter. Μ = dynamic viscosity (Ns/m 2, lb m /s ft) U = velocity based on the actual cross section area of the duct or pipe (m/s, ft/s) Reynolds Number can therefore be expressed as dynamic pressure (ρ u 2 ) to shearing stress (μ u / L).inertia force (ρ u L) to viscous or friction force (μ). ![]() Reynolds Number - the non-dimensional velocity - can be defined as the ratio
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