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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Prony equation ： ウィキペディア英語版 Prony equation The Prony equation (named after Gaspard de Prony) is a historically important equation in hydraulics, used to calculate the head loss due to friction within a given run of pipe. It is an empirical equation developed by Frenchman Gaspard de Prony in the 19th century: :$h\_f\; =\; \backslash frac\; (aV\; +\; bV^2)$ where ''hf'' is the head loss due to friction, calculated from: the ratio of the length to diameter of the pipe ''L/D'', the velocity of the flow ''V'', and two empirical factors ''a'' and ''b'' to account for friction. This equation has been supplanted in modern hydraulics by the Darcy–Weisbach equation, which used it as a starting point. ==References== *. The Prony equation and its replacement by the Darcy–Weisbach equation are on pp. 11–12. 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「Prony equation」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.