Laplace number

The Laplace number (La), also known as the Suratman number (Su), is a dimensionless number used in the characterization of free surface fluid dynamics. It is represents a ratio of surface tension to the momentum-transport (especially dissipation) inside a fluid.

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It is defined as follows:

where:

• σ = surface tension
• ρ = density
• L = characteristic length
• μ = dynamic viscosity

See also

• Ohnesorge number - There is an inverse relationship, La = Oh ^{− 2}, between the Laplace number and the Ohnesorge number.