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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 Atkinson friction factor ： ウィキペディア英語版 Atkinson friction factor Atkinson friction factor is a measure of the resistance to airflow of a duct. It is widely used in the mine ventilation industry but is rarely referred to outside of it. Atkinson friction factor is represented by the symbol $k$ and has the same units as air density (kilograms per cubic metre in SI units, lbfmin^2/ft^4 in Imperial units). It is related to the more widespread Fanning friction factor by $$ k = \frac\rho f, in which $\backslash rho$ is the density of air in the shaft or roadway under consideration and $f$ is Fanning friction factor (dimensionless). It is related to the Darcy friction factor by $$ k = \frac\rho \frac, in which $\backslash lambda$ is the Darcy friction factor (dimensionless). It was introduced by John J Atkinson in an early mathematical treatment of mine ventilation (1862) and has been known under his name ever since. ==See also== * Atkinson resistance 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「Atkinson friction factor」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.