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In fluid dynamics, the Reynolds number (Re) is a dimensionless quantity that helps predict fluid flow patterns in different situations by measuring the ratio between inertial and viscous forces. [2] At low Reynolds numbers, flows tend to be dominated by laminar (sheet-like) flow, while at high Reynolds numbers, flows tend to be turbulent.
R = Reynolds number. The Reynolds number R is given by R = VL/ν, where: V = velocity L = axial length of organism ν = kinematic viscosity (viscosity/density) Notable Reynolds numbers: R < 0.5×10 6 = laminar flow threshold R > 2.0×10 6 = turbulent flow threshold. Scaling also has an effect on the performance of organisms in fluid.
Dimensionless numbers (or characteristic numbers) have an important role in analyzing the behavior of fluids and their flow as well as in other transport phenomena. [1] They include the Reynolds and the Mach numbers, which describe as ratios the relative magnitude of fluid and physical system characteristics, such as density, viscosity, speed of sound, and flow speed.
The Reynolds and Womersley Numbers are also used to calculate the thicknesses of the boundary layers that can form from the fluid flow’s viscous effects. The Reynolds number is used to calculate the convective inertial boundary layer thickness that can form, and the Womersley number is used to calculate the transient inertial boundary thickness that can form.
Elizabeth Noyes Hand (October 11, 1912 – December 24, 1987) was an American singer and actress best known for dubbing two of Debbie Reynolds' numbers in the 1952 film Singin' in the Rain. Today, this is a well-known example of dubbing in a film musical : While Reynolds's character was the " ghost singer " dubbing for another character in the ...
Marjorie Reynolds (née Goodspeed; August 12, 1917 – February 1, 1997) was an American film and television actress who appeared in more than 50 films, including the 1942 musical Holiday Inn, [1] in which she and Bing Crosby introduced the song "White Christmas" in a duet, albeit with her singing dubbed.
In a low Reynolds number environment, a scallop would only oscillate in place. In physics, the scallop theorem states that a swimmer that performs a reciprocal motion cannot achieve net displacement in a low-Reynolds number Newtonian fluid environment, i.e. a fluid that is highly viscous. Such a swimmer deforms its body into a particular shape ...
The magnetic Reynolds number has a similar form to both the Péclet number and the Reynolds number. All three can be regarded as giving the ratio of advective to diffusive effects for a particular physical field and have the form of the product of a velocity and a length divided by a diffusivity.