| 单词 | Reynolds number |
| 释义 | Reynolds number Symbol Re. A dimensionless number used in fluid dynamics to determine the type of flow of a fluid through a pipe, to design prototypes from small-scale models, etc. It is the ratio vρl/η, where v is the flow velocity, ρ is the fluid density, l is a characteristic linear dimension, such as the diameter of a pipe, and η is the fluid viscosity. In a smooth straight uniform pipe, laminar flow usually occurs if Re < 2000 and turbulent flow is established if Re > 3000. It is named after Osborne Reynolds (1842–1912) |
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