<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1680-0338</journal-id>
<journal-title><![CDATA[Ingeniería Hidráulica y Ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[riha]]></abbrev-journal-title>
<issn>1680-0338</issn>
<publisher>
<publisher-name><![CDATA[Centro de Investigaciones Hidráulicas (CIH). Facultad de Ingeniería Civil. Universidad Tecnológica de La Habana "José A. Hecheverría" CUJAE]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1680-03382019000300041</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Coeficiente de Hazen-Williams en función del número de Reynolds y la rugosidad relativa]]></article-title>
<article-title xml:lang="en"><![CDATA[Hazen-Williams coefficient as a function of Reynolds number and relative roughness]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alegret Breña]]></surname>
<given-names><![CDATA[Evio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Valdés]]></surname>
<given-names><![CDATA[Yaset]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Tecnológica de La Habana José Antonio Echeverría (Cujae) Centro de Investigaciones Hidráulicas (CIH) Dpto. de Ing. Hidráulica]]></institution>
<addr-line><![CDATA[ La Habana]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>40</volume>
<numero>3</numero>
<fpage>41</fpage>
<lpage>55</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1680-03382019000300041&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1680-03382019000300041&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1680-03382019000300041&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se presentan los resultados obtenidos de la evaluación del coeficiente de Hazen-Williams en función de la rugosidad relativa y el número de Reynolds, obteniendo como resultado que este varía en función de ambas variables y no tiene un valor constante. Se muestran los resultados del cálculo de las pérdidas de carga por fricción en tuberías utilizando las ecuaciones de Darcy-Weisbach y Hazen-Williams, para diferentes materiales con distintos valores de rugosidad relativa y números de Reynolds y coeficientes de Hazen-Williams. De este estudio comparativo se obtuvo como resultado que los valores de pérdidas de carga obtenidos por dichas ecuaciones difieren entre sí, excepto cuando se determina el coeficiente de Hazen-Williams en función de la rugosidad relativa y el número de Reynolds, obteniéndose errores comparativos que son despreciables.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT 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.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[coeficientes de rugosidad]]></kwd>
<kwd lng="es"><![CDATA[factor de fricción]]></kwd>
<kwd lng="es"><![CDATA[número de Reynolds]]></kwd>
<kwd lng="es"><![CDATA[pérdida de carga por fricción]]></kwd>
<kwd lng="es"><![CDATA[rugosidad relativa]]></kwd>
<kwd lng="en"><![CDATA[roughness coefficients]]></kwd>
<kwd lng="en"><![CDATA[friction factor]]></kwd>
<kwd lng="en"><![CDATA[Reynolds number]]></kwd>
<kwd lng="en"><![CDATA[friction head loss]]></kwd>
<kwd lng="en"><![CDATA[relative roughness]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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