Abstract

ALEGRET BRENA, Evio  and  MARTINEZ VALDES, Yaset. Hazen-Williams coefficient as a function of Reynolds number and relative roughness. riha [online]. 2019, vol.40, n.3, pp. 41-55.  Epub Sep 30, 2019. ISSN 1680-0338.

The results obtained from the evaluation of the Hazen-Williams coefficient are presented as a function of the relative roughness and the Reynolds number, obtaining as a result that it varies according to both variables, not having a constant value. The results of the calculation of friction head losses in pipes are shown using the Darcy-Weisbach and Hazen-Williams equations, for different materials with different values of relative roughness and Reynolds numbers and Hazen-Williams coefficients. From this comparative study it was obtained that the values of head losses obtained by those equations differ from each other, except when the Hazen-Williams coefficient is determined as a function of the relative roughness and the Reynolds number, in which case comparatives errors are negligible.

Keywords : roughness coefficients; friction factor; Reynolds number; friction head loss; relative roughness.

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