Laplace number
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The Laplace number (La) is a dimensionless number used in the characterisation of free surface fluid dynamics. It is related to the ratio of the surface tension to the momentum-transport inside a fluid.
It is defined as follows:
<math> La = \frac{\sigma \rho L}{\mu^2} <math>
where:
- σ = surface tension
- ρ = density
- L = characteristic length
- μ = absolute viscosity