Reynolds number visual. A vortex street around a cylinder--for any fluid, cylinder size and fluid speed, provided that there is a Reynolds number of between ~40 and 103.

### Micro Aerial Vehicle: Unsteady Aerodynamics, Low Reynolds Number

A bird or insect sized flapping wing Micro Aerial Vehicle (MAV) whose wingspan is of the order of a few centimeters cannot be physically built or flown today;

Aerodynamics: Airfoil Camber, Flaps, Slots-Slats & Drag: "Smoke Lifts" circa 1938 NACA Langley - YouTube

### Aerodynamics of Low Reynolds Number Flyers (Cambridge Aerospace Series)

Low Reynolds number aerodynamics is important to a number of natural and man-made flyers. Birds, bats, and insects have been of interest to biologists for years

Self-organization - Scholarpedia. Figure 5: Example of an instability hierarchy in fluids and gases. a) Liquid flow around a cylinder at small speed (Reynolds number r=10−2 ). b) At an increased, critical Reynolds number, a pair of vortices is formed. c) At still higher Reynolds number, the vortices start an oscillatory movement. d) What may be called “weak turbulence” is emerging. e) Fully developed turbulence (after Feynman et al. (1965)).

The plume from this candle flame goes from laminar to turbulent. The Reynolds number can be used to predict where this transition will take place.

reynolds number chart - Yahoo Image Search Results

fuckyeahfluiddynamics: A simple cylinder in a steady flow creates a beautiful wake pattern known as a von Karman vortex street. The image above shows several examples of this pattern. Flow is from bottom to top, and the Reynolds number is increasing from left to right. In the experiment, this increasing Reynolds number corresponds to increasing the flow velocity because the cylinder size, fluid, and temperature were all fixed. As the Reynolds number first increases, the cylinder begins to…

Evolution of a smoke trail behind a red cylinder (seen in cross-section, so it looks like a circle). At very rapid speeds (high Reynolds number), vortices break off turbulently, as seen here. This is a computer simulation done for my PhD thesis. - particle_person

reynolds number chart - Yahoo Image Search Results

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