Definition of Reynolds number in English:

Reynolds number

nounˈrɛn(ə)ldz

Physics

A dimensionless number used in fluid mechanics to indicate whether fluid flow past a body or in a duct is steady or turbulent.
〔物理〕雷诺数
This is evaluated as ρυd/μ, where d is a diameter or other characteristic length of the system, υ is a typical speed, ρ is the fluid density, and μ is the viscosity of the fluid. The magnetic Reynolds number is an analogous number used in the description of the dynamic behaviour of a magnetized plasma
Example sentencesExamples
- He spoke on boundary layer theory, in particular flows at high Reynolds numbers, in his inaugural lecture in London.
- The Reynolds number equation states that turbulent flow is created by higher gas velocity, gas density, and tube radius and lower gas viscosity.
- The higher Reynolds number for the tadpole indicates that it is ‘faster and better at overcoming the viscous drag that typically confronts small aquatic organisms,’ the biologists report in Nature.
- For the purpose of biological fluid dynamics, scale is represented by the dimensionless Reynolds number, a ratio that reflects the influence of inertial relative to viscous forces.
- Small objects have lower Reynolds numbers - a dimensionless quantity proportional to the ratio of the product of the size and flow speed to viscosity.

Origin

Early 20th century: named after Osborne Reynolds (1842–1912), English physicist.

词汇	Reynolds number
释义	Definition of Reynolds number in English: Reynolds number nounˈrɛn(ə)ldz Physics A dimensionless number used in fluid mechanics to indicate whether fluid flow past a body or in a duct is steady or turbulent. 〔物理〕雷诺数 This is evaluated as ρυd/μ, where d is a diameter or other characteristic length of the system, υ is a typical speed, ρ is the fluid density, and μ is the viscosity of the fluid. The magnetic Reynolds number is an analogous number used in the description of the dynamic behaviour of a magnetized plasma Example sentencesExamples He spoke on boundary layer theory, in particular flows at high Reynolds numbers, in his inaugural lecture in London. The Reynolds number equation states that turbulent flow is created by higher gas velocity, gas density, and tube radius and lower gas viscosity. The higher Reynolds number for the tadpole indicates that it is ‘faster and better at overcoming the viscous drag that typically confronts small aquatic organisms,’ the biologists report in Nature. For the purpose of biological fluid dynamics, scale is represented by the dimensionless Reynolds number, a ratio that reflects the influence of inertial relative to viscous forces. Small objects have lower Reynolds numbers - a dimensionless quantity proportional to the ratio of the product of the size and flow speed to viscosity. Origin Early 20th century: named after Osborne Reynolds (1842–1912), English physicist.
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