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Galilei number

In fluid dynamics, the Galilei number (Ga), sometimes also referred to as Galileo number (see discussion), is a dimensionless number named after Italian scientist Galileo Galilei (1564-1642).

It may be regarded as proportional to gravity forces divided by viscous forces. The Galilei number is used in viscous flow and thermal expansion calculations, for example to describe fluid film flow over walls. These flows apply to condensors or chemical columns.

Ga = \frac{g \cdot L^3}{\nu^2}
  • g: gravitational acceleration, (SI units: m/s2)
  • L: characteristic length, (SI units: m)
  • ν: characteristic, kinematic viscosity (SI units: m2/s)

See also


  • VDI-Wärmeatlas; 5., extended Edition; VDI Verlag Düsseldorf; 1988; page Bc 1 (German)
  • W. Wagner; Wärmeübertragung; 5., revised Edition; Vogel Fachbuch; 1998; page 119 (German)
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Galilei_number". A list of authors is available in Wikipedia.
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