Definition of Rayleigh number in English:

Rayleigh number


  • A dimensionless parameter that is a measure of the instability of a layer of fluid due to differences of temperature and density at the top and bottom.

    • ‘Further, Honda et al. assume constant viscosity, which is an important element of the Rayleigh number.’
    • ‘By the mid-twentieth century, geophysicists had determined that the Earth's mantle was likely to advect heat from the core, because its Rayleigh number far exceeds the convective threshold.’


Rayleigh number