Rayleigh Number
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Rayleigh Number
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The nondimensional ratio between the product of buoyancy forces and heat
advection and the product of viscous forces and heat conduction in a fluid.
It is written as
Missing Image:img src="SP7_r_files/rayleigh.gif"
where g is the acceleration of gravity; Δ_{z}T is a characteristic
vertical temperature difference in the characteristic depth d ; α
is the coefficient of expansion; v is the kinematic viscosity; and
k the thermometric conductivity.
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The Rayleigh number is equal to the product of the Grashof and Prandtl numbers, and is the critical parameter
in the theory of thermal instability. [[/a>|/a>
]]
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use