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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 Reaction–diffusion–advection equation ： ウィキペディア英語版 Reaction–diffusion–advection equation The reaction–diffusion–advection equation is a partial differential equation that models the concentration of a chemical species in a classical reaction–diffusion–advection process. In that process, a chemical species undergoes a reaction, can diffuse in the solvent, and is transported by the bulk movement of the solvent (advection). The equation modeling the concentration $u(\backslash boldsymbol,t)$ (units: M), $\backslash boldsymbol\; \backslash in\; \backslash mathbb^n$ of the chemical species ''u'' is: :$\backslash frac\; +\; \backslash nabla\; \backslash cdot\; \backslash left(\; \backslash boldsymbol\; u\; -\; D\backslash nabla\; u\; \backslash right)\; =\; f,$ where ''D'' is the diffusion coefficient (units: length2 /time), $\backslash boldsymbol\; \backslash in\; \backslash mathbb^n$ is the bulk velocity (units: length/time), and $f$ (units: M/s) is the reaction term that models the generation or decay of the species ''u''. In general, each $f,D,$ and $\backslash boldsymbol$ may depend on space, time, or the concentration of ''u'' itself. The equation above is a conservation of mass in a continuum model, where accumulation at a point is the next flux (rate in minus rate out) of a point plus the generation at that point (see continuity equation). ==See also== *Reaction–diffusion equation *Advection–diffusion equation 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「Reaction–diffusion–advection 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.