“Rayleigh number”的概念、定义、翻译、参考文献-科学参考

Rayleigh number

Astronomy

A parameter that determines when convection may occur in a gas or liquid. Convection can occur when more energy is gained by moving material than is lost to friction. The Rayleigh number is dimensionless and depends on the local gravitational acceleration and the properties of the material. Convection occurs when the Rayleigh number exceeds a critical limit. The Rayleigh number is used in modelling stellar and planetary interiors and planetary atmospheres. It is named after the English physicist Lord Rayleigh (1842–1919).

Geology and Earth Sciences

A dimensionless value used to estimate when convection commences in a fluid. The Ra depends on the density and depth of the fluid, the coefficient of thermal expansion, the gravitational field, the temperature gradient (in excess of the adiabatic gradient), the thermal diffusivity, and the kinematic viscosity. Convection usually starts when Ra is 1000 or more, while heat transfer is entirely by conduction when Ra is less than 10.

单词	Rayleigh number
释义	Rayleigh number Astronomy A parameter that determines when convection may occur in a gas or liquid. Convection can occur when more energy is gained by moving material than is lost to friction. The Rayleigh number is dimensionless and depends on the local gravitational acceleration and the properties of the material. Convection occurs when the Rayleigh number exceeds a critical limit. The Rayleigh number is used in modelling stellar and planetary interiors and planetary atmospheres. It is named after the English physicist Lord Rayleigh (1842–1919). Geology and Earth Sciences A dimensionless value used to estimate when convection commences in a fluid. The Ra depends on the density and depth of the fluid, the coefficient of thermal expansion, the gravitational field, the temperature gradient (in excess of the adiabatic gradient), the thermal diffusivity, and the kinematic viscosity. Convection usually starts when Ra is 1000 or more, while heat transfer is entirely by conduction when Ra is less than 10.
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