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In fluid dynamics, the Darcy friction factor formulae are equations – based on experimental data and theory – for the Darcy friction factor. The Darcy friction factor is a dimensionless quantity used in the Darcy–Weisbach equation, for the description of friction losses in pipe flow as well as open channel flow. It is also known as the Darcy–Weisbach friction factor, resistance coefficient or simply friction factor and is four times larger than the Fanning friction factor.〔, 420 pages. See page 293.〕 ==Flow regime== Which friction factor formula may be applicable depends upon the type of flow that exists: *Laminar flow *Transition between laminar and turbulent flow *Fully turbulent flow in smooth conduits *Fully turbulent flow in rough conduits *Free surface flow. 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「Darcy friction factor formulae」の詳細全文を読む スポンサード リンク
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