An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Hagen number (Hg)
  عدد ِ هاگن  
adad-e Hagen
Fr.: nombre de Hagen  

A dimensionless number characterizing the importance of → viscous force in a → forced flow.

Etymology (EN): named after the German hydraulic engineer Gotthilf H. L. Hagen (1797-1884); → number.