Calculate the dimensionless Reynolds number for pipes, rectangular ducts and general flow.
The Reynolds number approximates the ratio of kinetic energy over viscous drag loss.
`Re = ρ V L / μ = V L / ν `
where :
Re = Reynolds number
ρ = fluid density
V = fluid velocity
L = characteristic length
μ = dynamic viscosity
ν = kinematic viscosity = μ / ρ
At low reynolds numbers the flow is laminar. At high Reynolds numbers the flow is turbulent. The characteristic length is a defining length dimension. For pipelines the inside diameter is used as the characteristic length. For rectangular ducts the hydraulic diameter is used as the characteristic length.
`ID = 2 w h / (w + h) `
where :
ID = hydraulic diameter
w = duct width
h = duct height
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