Re-evaluation of Hazen-Williams Coefficient <i>C</i> of Pipeline (I)

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Other Title
  • 管路の流速係数<i>C</i>の再評価（I）
  • - Relationship between Reynolds Number <i>Re</i>, Friction Loss Coefficient <i>f</i> and Coefficient <i>C</i> -
  • -レイノルズ数<i>Re</i>，摩擦損失係数<i>f</i>と流速係数<i>C</i>の関係-

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<p>  There are two types of mean flow velocity formulas for pipes, the Darcy-Weisbach equation and the Hazen-Williams equation. In the process of deriving the Hazen-Williams equation from the Darcy-Weisbach equation, it was clarified that the friction loss coefficient f is expressed by the exponential function of f ＝ aRe-b. Next, the Hazen-Williams equation C was obtained by eliminating the effect of the Reynolds number Re. It was confirmed that only the constant a remained in the equation C and there was almost no influence of water temperature and viscosity, and the meanings of the constants a and b were considered. When designing the pipeline, the influence of the relative roughness k/D on the inner surface of the pipe was evaluated using the Colebrook equation in order to set the transition section in which both the effects of viscosity and roughness are effective as the design range. The relationship between these hydraulic constants f, C, Re and k/D was verified by the Moody chart, and hydraulic issues were raised in the design.</p>

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