Eötvös number

Eötvös number

In fluid dynamics the Eötvös number (Eo) is a dimensionless number named after Hungarian physicist Loránd Eötvös (1848-1919).

Together with Morton number it can be used to characterize the shape of bubbles or drops moving in a surrounding fluid.Eötvös number may be regarded as proportional to buoyancy force divided by surface tension force.

:mathrm{Eo}=frac{Delta ho ,g ,L^2}{sigma}

* Delta ho: difference in density of the two phases, (SI units : kg/m3)
* g: gravitational acceleration, (SI units : m/s2)
* L: characteristic length, (SI units : m)
* sigma: surface tension, (SI units : N/m)

ee also

* Bond number - The Eötvös number is equal to the bond number. Usage of Eötvös number in favor of Bond number is seen in Europe.

References

R. Clift, J.R. Grace, M.E. Weber, Bubbles Drops and Particles, Academic Press New York, 1979, p.26


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