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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 Shields parameter ： ウィキペディア英語版 Shields parameter The Shields parameter, also called the Shields criterion or Shields number, is a nondimensional number used to calculate the initiation of motion of sediment in a fluid flow. It is a nondimensionalization of a shear stress, and is typically denoted $\backslash tau\_\backslash ast$ or $\backslash theta$. It is given by: :$\backslash tau\_\backslash ast\; =\; \backslash theta\; =\; \backslash frac,$ where: * $\backslash tau$ is a dimensional shear stress; * $\backslash rho\_s$ is the density of the sediment; * $\backslash rho$ is the density of the fluid; * $g$ is acceleration due to gravity; *$D$ is a characteristic particle diameter of the sediment. ==Physical meaning== By multiplying the top and bottom of the Shields parameter by ''D''2, you can see that it is proportional to the ratio of fluid force on the particle to the weight of the particle. 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「Shields parameter」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.