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| 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).
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| 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.
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| :<math> \mathrm{Ga} =Re^2Ri= \frac{g\, L^3}{\nu^2}</math>
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| * ''g'': [[gravitational acceleration]], ([[SI]] units: m/s<sup>2</sup>)
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| * ''L'': characteristic length, ([[SI]] units: m)
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| * ''ν'': characteristic [[Viscosity#Kinematic viscosity|kinematic viscosity]], ([[SI]] units: m<sup>2</sup>/s)
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| ==See also==
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| *[[Archimedes number]]
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| ==References==
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| *VDI-Wärmeatlas; 5., extended Edition; VDI Verlag Düsseldorf; 1988; page Bc 1 (German)
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| *W. Wagner; Wärmeübertragung; 5., revised Edition; Vogel Fachbuch; 1998; page 119 (German)
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| ==External links==
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| * [http://www.processassociates.com/process/dimen/dn_gal.htm Website referring to the Galileo number with calculator]
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| * [http://www.ch.tum.de/tc1/Downloads/Kennzahlen.pdf Table of dimensionless numbers (German)]
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| * [http://www.uni-bonn.de/www/LMT/studium/Studienunterlagen/bilder/Dimensionslose%20Kenngroessen.pdf Table of dimensionless numbers (German)]
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| {{NonDimFluMech}}
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| [[Category:Dimensionless numbers of fluid mechanics]]
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| [[Category:Fluid dynamics]]
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| [[Category:Galileo Galilei|Number]]
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Latest revision as of 15:05, 8 September 2014
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