Reynolds number
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In fluid dynamics, the Reynolds number is a dimensionless quantity that helps predict fluid flow patterns in different situations by measuring the ratio between inertial and viscous forces. At low Rey
The plume from this candle flame transitions from laminar to turbulent.
George Stokes introduced Reynolds numbers.
The Brezina equation
Universal sedimentation equation — drag coefficient, a function of Reynolds number and shape factor, 2D diagram
Kármán vortex street
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In fluid dynamics, a Kármán vortex street is a repeating pattern of swirling vortices, caused by a process known as vortex shedding, which is responsible for the unsteady separation of flow of a fluid
Visualisation of the vortex street behind a circular cylinder in air (on the left); the flow is made visible through release of glycerol vapour in the air near the cylinder
A look at the Kármán vortex street effect from ground level, as air flows quickly from the Pacific Ocean eastward over Mojave Desert mountains. This phenomenon observed from ground level is extremely rare; most cloud-related Kármán vortex street activity is viewed from space.
Chimneys with strakes fitted to break up vortices
Vortex street 1