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From considerations of Colebrook-White flow resistance formula and based on assumption of constant shear stress along wetted perimeter, corrected practical formulas are derived for calculation of water flow velocity for given pipe and hydraulic gradient and for dimensioning of circular pipe; effect of nonuniform shear distribution in open-channel flow is then investigated; it is shown that traditional concept of hydraulic radius is unsatisfactory and should be replaced with so-called "resistance radius", accounting for shape of cross section; validity of concept is experimentally verified.
From considerations of Colebrook-White flow resistance formula and based on assumption of constant shear stress along wetted perimeter, corrected practical formulas are derived for calculation of water flow velocity for given pipe and hydraulic gradient and for dimensioning of circular pipe; effect of nonuniform shear distribution in open-channel flow is then investigated; it is shown that traditional concept of hydraulic radius is unsatisfactory and should be replaced with so-called "resistance radius", accounting for shape of cross section; validity of concept is experimentally verified.
Flow resistance and hydraulic radius
Acta Polytechnica Scandinavica -- Civ Eng Bldg Construction Ser Ci 24
Engelund, F. (author)
1964
23 pages
Article (Journal)
English
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Flow resistance and hydraulic radius
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