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Reynolds number

British

noun

a dimensionless number, v ρ l /η, where v is the fluid velocity, ρ the density, η the viscosity and l a dimension of the system. The value of the number indicates the type of fluid flow

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of Reynolds number

C19: named after Osborne Reynolds (1842–1912), British physicist

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The degree of laminar or turbulent flow is referred to as the Reynolds number, which is inversely proportional to the viscosity.

From Science Daily • Jan. 30, 2024

The Reynolds law of dynamic similarity or Reynolds similitude, states that if two fluids flow around similar structures with different length scales, they are hydrodynamically identical provided they exhibit the same Reynolds number.

From Science Daily • Jan. 30, 2024

In aerodynamics, the Reynolds number is a quantity that helps predict the flow pattern of fluids.

From Science Daily • Jan. 26, 2024

Show that the Reynolds number NR is unitless by substituting units for all the quantities in its definition and cancelling.

From Textbooks • Aug. 12, 2015

Mastery of the Reynolds number, and using that knowledge to build wind tunnels that successfully simulated real-world conditions, was the key to the NACAs success.

From "Hidden Figures" by Margot Lee Shetterly

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023