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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 heat current ： ウィキペディア英語版 heat current A heat current is a kinetic exchange rate between molecules, relative to the material in which the kinesis occurs. It is defined as $\backslash frac$, where $Q$ is heat and $t$ is time. For conduction, heat current is defined by Fourier's law as : $\backslash frac\; =\; -k\; \backslash oint\_S\}$ where :$\backslash big.\; \backslash frac\backslash big.$ is the amount of heat transferred per unit time () and : :$\backslash overrightarrow$ is an oriented surface area element () The above differential equation, when integrated for a homogeneous material of 1-D geometry between two endpoints at constant temperature, gives the heat flow rate as: : $\backslash big.\; \backslash frac\; =\; -k\; A\; \backslash frac$ where : ''A'' is the cross-sectional surface area, : $\backslash Delta\; T$ is the temperature difference between the ends, : $\backslash Delta\; x$ is the distance between the ends. For thermal radiation, heat current is defined as :$W\; =\; \backslash sigma\; \backslash cdot\; A\; \backslash cdot\; T^4$ where the constant of proportionality $\backslash sigma$ is the Stefan–Boltzmann constant, $A$ is the radiating surface area, and $T$ is temperature. Heat current can also be thought of as the total phonon distribution multiplied by the energy of one phonon, times the group velocity of the phonons. The phonon distribution of a particular phonon mode is given by the Bose-Einstein factor, which is dependent on temperature and phonon energy. ==See also== * Thermal conduction * Thermal conductivity de:Wärmestrom eo:Varmokurento 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「heat current」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.