Grashof number
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The Grashof number is a dimensionless number in fluid dynamics which approximates the ratio of the buoyancy force to the viscous force acting on a fluid.
- <math> Gr = \frac{g \beta (T_s - T_\infty ) L^3}{\nu ^2}\, <math>
where
- g = acceleration of gravity
- β = volumetric thermal expansion coefficient
- Ts = source temperature
- T∞ = quiescent temperature
- L = characteristic length
- ν = kinematic viscosityde:Grashof-Zahl