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Rayleigh number

The Rayleigh number is a dimensionless number defined as the product of Grashof and Prandtl numbers. For free convection near a vertical wall, this number is

Rax,c=Grx,cPr =  g β (Ts-T∞)x3
                ν α
where

Ra   Rayleigh number
Gr   Grashof number
Pr   Prandtl number
g    gravity
Ts   Temperature of surface
T∞     Quiescent temperature
ν    kinematic viscosity
α    thermal diffusivity
The Rayleigh number is named after Lord Rayleigh.


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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Rayleigh number".