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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 Extensional viscosity ： ウィキペディア英語版 Extensional viscosity Extensional viscosity (also known as elongational viscosity) is a viscosity coefficient when applied stress is extensional stress.〔Barnes, H.A. "A handbook of elementary rheology", Institute of non-Newtonian Fluid Mechanics, 2000〕 :This parameter is often used for characterizing polymer solutions. ''Extensional viscosity'' can be measured using rheometers that apply ''extensional stress''. Acoustic rheometer is one example of such devices. :$\backslash eta\_e\; =\; \backslash frac\backslash ,\backslash !$ :$\backslash dot\backslash ,\backslash !$ is the rate of strain: $\backslash dot\; =\; \backslash frac\backslash frac\backslash ,\backslash !$ For a Newtonian Fluid, the uniaxial elongational viscosity is three times the shear viscosity which can be derived using the continuity equation for incompressible fluids. :$\backslash eta\_e\; =\; 3\backslash eta\backslash ,\backslash !$ (Trouton's law) ==See also== *Rheology *Viscosity *Trouton's ratio 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「Extensional viscosity」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.