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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 Fourier number ： ウィキペディア英語版 Fourier number In physics and engineering, the Fourier number (Fo) or Fourier modulus, named after Joseph Fourier, is a dimensionless number that characterizes transient heat conduction. Conceptually, it is the ratio of diffusive or conductive transport rate to the quantity storage rate, where the quantity may be either heat (thermal energy) or matter (particles). The number derives from non-dimensionalization of the heat equation (also known as Fourier's Law) or Fick's second law and is used along with the Biot number to analyze time dependent transport phenomena. == Definition == The general Fourier number is defined as: :$$\backslash mathrm\; =\; \backslash frac$$ The thermal Fourier number, , is defined by the conduction rate to the rate of thermal energy storage: :$$\backslash mathrm\_h\; =\; \backslash frac$$ where: * $\backslash alpha\; =\; \backslash tfrac$ is the thermal diffusivity (SI units: m2/s) * ''t'' is the characteristic time (s) * ''L'' is the length through which conduction occurs (m) For transient mass transfer by diffusion, there is an analogous mass Fourier Number, , defined by: :$$\backslash mathrm\_m\; =\; \backslash frac$$ where: * ''D'' is the diffusivity (m2/s) * ''t'' is the characteristic timescale (s) * ''L'' is the length scale of interest (m) 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「Fourier 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.