Laplace number

From Free net encyclopedia

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 viscositynl:Getal van Laplace