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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 mixing length model ： ウィキペディア英語版 mixing length model In fluid dynamics, mixing length model is a method attempting to describe momentum transfer by turbulence Reynolds stresses within a newtonian fluid boundary layer by means of an eddy viscosity. The model was developed by Ludwig Prandtl in the early 20th century. Prandtl himself had reservations about the model, describing it as, "only a rough approximation," but it has been used in numerous fields ever since, including atmospheric science, oceanography and stellar structure. ==Physical intuition== The mixing length is conceptually analogous to the concept of mean free path in thermodynamics: a fluid parcel will conserve its properties for a characteristic length, $\backslash \; \backslash xi\text{'}$, before mixing with the surrounding fluid. Prandtl described that the mixing length, In the figure above, temperature, $\backslash \; T$, is conserved for a certain distance as a parcel moves across a temperature gradient. The fluctuation in temperature that the parcel experienced throughout the process is $\backslash \; T\text{'}$. So $\backslash \; T\text{'}$ can be seen as the temperature deviation from its surrounding environment after it has moved over this mixing length $\backslash \; \backslash xi\text{'}$. 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「mixing length model」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.