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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 Euler number (physics) ： ウィキペディア英語版 Euler number (physics) The Euler number (Eu) is a dimensionless number used in fluid flow calculations. It expresses the relationship between a local pressure drop e.g. over a restriction and the kinetic energy per volume, and is used to characterize losses in the flow, where a perfect frictionless flow corresponds to an Euler number of 1. The inverse of the Euler number is referred to as the Ruark Number with the symbol Ru. It is defined as :$$ \mathrm=\frac} where *$\backslash rho$ is the density of the fluid. *$p\_\}$ is the downstream pressure. *$V$ is a characteristic velocity of the flow. The cavitation number has a similar structure, but a different meaning and use: The Cavitation number (Ca) is a dimensionless number used in flow calculations. It expresses the relationship between the difference of a local absolute pressure from the vapor pressure and the kinetic energy per volume, and is used to characterize the potential of the flow to cavitate. It is defined as :$$ \mathrm=\frac\rho V^2} where *$\backslash rho$ is the density of the fluid. *$p$ is the local pressure. *$p\_\backslash mathrm$ is the vapor pressure of the fluid. *$V$ is a characteristic velocity of the flow. ==See also== * Reynolds number for use in flow analysis and similarity of flows 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「Euler number (physics)」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.