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\mbox{Gr} = \frac{g \, \beta \, \Delta T \, L^3}{\nu^2}

where

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body\Delta T

temperature
Temperature gradient across Natural Thermal Convection

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beta

nu

Kinematic viscosity of the fluid
Thermal expansion coefficient

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Lcharacteristic length

\beta

Thermal expansion coefficient of the fluid

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\nuKinematic viscosity

g

Standard gravity constant

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g

L

Characteristic length of Natural Thermal Convection
Standard gravity constant



See also

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Physics / Thermodynamics / Heat Transfer

Dimensionless Heat Transfer Numbers ] [ Prandtl number ] Rayleigh number ]