Rayleigh Number
Rayleigh number, abbreviated as Ra, a dimensionless number, is associated with free or natural convection. It is a modified Grashof number used for natural convection calculations. This calculator determines the Rayleigh Number where the absolute viscosity, fluid density, length, temperature differential, thermal diffusivity and thermal expansion are known values. Some common values of nonmetallic thermal diffusivity values can be found here.
Rayleigh number calculator
Rayleigh Number fromula
Where:\(\large{ Ra }\) = Rayleigh number \(\large{ \mu }\) (Greek symbol mu) = absolute viscosity \(\large{ \rho }\) (Greek symbol rho) = density of fluid \(\large{ g }\) = gravitational acceleration \(\large{ l }\) = length \(\large{ \Delta T }\) = temperature differential \(\large{ \alpha }\) (Greek symbol alpha) = thermal diffusivity \(\large{ \alpha_c }\) (Greek symbol alpha) = thermal expansion coefficient


Tags: Equations for Heat Transfer Equations for Force Calculators