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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 Bagnold number ： ウィキペディア英語版 Bagnold number The Bagnold number (Ba) is the ratio of grain collision stresses to viscous fluid stresses in a granular flow with interstitial Newtonian fluid, first identified by Ralph Alger Bagnold. The Bagnold number is defined by : $\backslash mathrm=\backslash frac$, where $\backslash rho$ is the particle density, $d$ is the grain diameter, $\backslash dot$ is the shear rate and $\backslash mu$ is the dynamic viscosity of the interstitial fluid. The parameter $\backslash lambda$ is known as the linear concentration, and is given by : $\backslash lambda=\backslash frac\}\; -\; 1\}$, where $\backslash phi$ is the solids fraction and $\backslash phi\_0$ is the maximum possible concentration (see random close packing). In flows with small Bagnold numbers (Ba < 40), viscous fluid stresses dominate grain collision stresses, and the flow is said to be in the 'macro-viscous' regime. Grain collision stresses dominate at large Bagnold number (Ba > 450), which is known as the 'grain-inertia' regime. A transitional regime falls between these two values. ==See also== * Bingham plastic 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「Bagnold number」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.