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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 Sherwood number ： ウィキペディア英語版 Sherwood number The Sherwood number (Sh) (also called the mass transfer Nusselt number) is a dimensionless number used in mass-transfer operation. It represents the ratio of the total rate of mass transfer to the rate of diffusive mass transport alone, and is named in honor of Thomas Kilgore Sherwood. It is defined as follows :$\backslash mathrm\; =\; \backslash frac\; =\; \backslash frac\}$ where * ''L'' is a characteristic length (m) * ''D'' is mass diffusivity (m2.s−1) * ''K'' is the mass transfer coefficient (m.s−1) Using dimensional analysis, it can also be further defined as a function of the Reynolds and Schmidt numbers: :$\backslash mathrm\; =\; f(\backslash mathrm,\; \backslash mathrm)$ For example, for a single sphere it can be expressed as: :$\backslash mathrm\; =\; \backslash mathrm\_0\; +\; C\backslash ,\; \backslash mathrm^\backslash ,\; \backslash mathrm^\}$ where $\backslash mathrm\_0$ is the Sherwood number due only to natural convection and not forced convection. A more specific correlation, the Froessling equation: :$\backslash mathrm\; =\; 2\; +\; 0.552\backslash ,\; \backslash mathrm^\}\backslash ,\; \backslash mathrm^\}$ This form is particularly valuable to chemical engineers in situations where the Reynolds number and Schmidt number are readily available. Since Re and Sc are both dimensionless numbers, the Sherwood number is also dimensionless. These correlations are the mass transfer analogs to heat transfer correlations of the Nusselt number in terms of the Reynolds number and Prandtl number. For a correlation for a given geometry (e.g. spheres, plates, cylinders, etc.), a heat transfer correlation (often more readily available from literature and experimental work, and easier to determine) for the Nusselt number (Nu) in terms of the Reynolds number (Re) and the Prandtl number (Pr) can be used as a mass transfer correlation by replacing the Prandtl number with the analogous dimensionless number for mass transfer, the Schmidt number, and replacing the Nusselt number with the analogous dimensionless number for mass transfer, the Sherwood number. As an example, a heat transfer correlation for spheres is given by the Ranz-Marshall Correlation: : This correlation can be made into a mass transfer correlation using the above procedure, which yields: : This is a very concrete way of demonstrating the analogies between different forms of transport phenomena. ==References== 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「Sherwood 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.