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The Moody chart or Moody diagram is a graph in non-dimensional form that relates the Darcy-Weisbach friction factor ''f''''D'', Reynolds number Re, and relative roughness for fully developed flow in a circular pipe. It can be used for working out pressure drop or flow rate down such a pipe. == History == In 1944, Lewis Ferry Moody plotted the Darcy–Weisbach friction factor against Reynolds number Re for various values of relative roughness ε / ''D''.〔 〕 This chart became commonly known as the Moody Chart or Moody Diagram. It adapts the work of Hunter Rouse but uses the more practical choice of coordinates employed by R. J. S. Pigott, whose work was based upon an analysis of some 10,000 experiments from various sources. Measurements of fluid flow in artificially roughened pipes by J. Nicuradse〔 These show in detail the transition region for pipes with high relative roughness (ε / ''D'' > 0.001). 〕 were at the time too recent to include in Pigott's chart. The chart's purpose was to provide a graphical representation of the function of C. F. Colebrook in collaboration with C. M. White, which provided a practical form of transition curve to bridge the transition zone between smooth and rough pipes, the region of incomplete turbulence. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Moody chart」の詳細全文を読む スポンサード リンク
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