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IEVref:113-04-58ID:
Language:enStatus: Standard
Term: Rayleigh number
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Symbol: Ra
Definition: quantity of dimension 1 characterizing the relative importance of natural convection and thermal conduction, defined by Ra= l 3 ρ 2 c p g α V ΔT ηλ = l 3 g α V ΔT να MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqk0di9Wr=fpeei0di9v8qiW7rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiaadkfacaWGHbGaey ypa0ZaaSaaaeaacaWGSbWaaWbaaSqabeaajugabiaaiodaaaGccqaH bpGCdaahaaWcbeqaaKqzaeGaaGOmaaaakiaadogadaWgaaWcbaGaam iCaaqabaGccaaMi8Uaam4zaiaayIW7cqaHXoqydaWgaaWcbaGaamOv aaqabaGccaaMi8ocdaGae8hLdqKaamivaaqaaiabeE7aOjaayIW7cq aH7oaBaaGaeyypa0ZaaSaaaeaacaWGSbWaaWbaaSqabeaajugabiaa iodaaaGccaWGNbGaaGjcVlabeg7aHnaaBaaaleaacaWGwbaabeaaki aayIW7cqWFuoarcaWGubaabaGaeqyVd4MaaGjcVlabeg7aHbaaaaa@63F6@ , where l is a specified length, ρ is mass density, cp is specific heat capacity at constant pressure, g is acceleration of free fall, αv is the cubic expansion coefficient, T is thermodynamic temperature, η is dynamic viscosity, λ is thermal conductivity, and α is thermal diffusivity

NOTE The Rayleigh number is the product of the Grashof number Gr and the Prandtl number Pr, thus Ra = GrPr.


Publication date:2011-04
Source:
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Internal notes:2015-11-02: Note corrected from "NOTE The Rayleigh number is the product of the Grashof number <i>Re</i>" to "NOTE The Rayleigh number is the product of the Grashof number <i>Gr</i>" in accordance with mail from Reinhard Salffner. JGO

2017-06-02: Cleanup - Remove Attached Image 113-04-58en.gif
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