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((short description|German physicist))
((Refimprove|date=October 2009))
((Infobox scientist
| name                    = Paul Richard Heinrich Blasius
| image                   = 
| image_size              = 
| caption                 = 
| birth_date              = 9 August 1883
| birth_place             = [[Berlin]], [[Province of Brandenburg|Brandenburg]], [[Kingdom of Prussia|Prussia]], [[Imperial Germany]]
| death_date              = ((death date and age|1970|4|24|1883|8|9|df=y))
| death_place             = [[Hamburg]], [[West Germany]]
| residence               = 
| citizenship             = [[Germany|German]]
| nationality             = [[Germany|German]]
| ethnicity               =
| field                   = [[Fluid mechanics]] and [[mechanical engineering]]
| work_institution        = 
| alma_mater              = [[University of Göttingen]]
| thesis_title            = Boundary layers in liquids with low friction
| thesis_year             = 1907
| doctoral_advisor        = [[Ludwig Prandtl]]
| doctoral_students       = 
| known_for               = [[Blasius boundary layer]]<br />[[Blasius theorem]]
| prizes                  = 
| religion                = 
| footnotes               = 
))

'''Paul Richard Heinrich Blasius''' (9 August 1883 – 24 April 1970) was a [[Germans|German]] [[fluid dynamics]] [[physicist]]. He was one of the first students of [[Ludwig Prandtl|Prandtl]].

Blasius provided a mathematical basis for [[boundary-layer]] drag but also showed as early as 1911 that the resistance to flow through smooth pipes could be expressed in terms of the [[Reynolds number]] for both laminar and turbulent flow. After six years in science he changed to ''Ingenieurschule Hamburg'' (today: University of Applied Sciences Hamburg) and became a Professor. On 1 April 1962 Heinrich Blasius celebrated his 50th anniversary in teaching. He was active in his field until he died on 24 April 1970.

One of his most notable contributions involves a description of the steady two-dimensional [[Blasius boundary layer|boundary-layer]] that forms on a [[semi-infinite]] plate that is held parallel to a constant unidirectional flow <math>U</math>.

==Correlations==
First law of Blasius for turbulent [[Fanning friction factor]]:

: <math>f/2=0.039 Re^{-0.25} \, </math>

Second law of Blasius for turbulent [[Fanning friction factor]]:

: <math>f/2=0.023 Re^{-0.22} \, </math>

Law of Blasius for friction coefficient in turbulent pipe flow:

: <math>\lambda=0.3164 Re^{-0.25} \, </math>

==See also==
*[[Blasius function]]

==Notes==
((reflist))

==References==
* [[Willi H. Hager|Hager, W.H.]], "Blasius: A life in research and education," ''Experiments in Fluids,'' '''34''': 566–571 (2003)
* Blasius, H., "Das Aehnlichkeitsgesetz bei Reibungsvorgängen in Flüssigkeiten", Mitteilungen über Forschungsarbeiten auf dem Gebiete des Ingenieurwesens, vol.134, VDI-Verlag Berlin (1913)

==External links==
* ((MathGenealogy|id=63525))

((Authority control))

((DEFAULTSORT:Blasius, Heinrich))
[[Category:1883 births]]
[[Category:1970 deaths]]
[[Category:20th-century German physicists]]
[[Category:Fluid dynamicists]]

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