VISCOSITY MODEL DETERMINATION METHOD, APPARENT VISCOSITY ESTIMATION METHOD, AND TORQUE ESTIMATION METHOD

To provide a viscosity model determination method for estimating the apparent viscosity of non-Newtonian fluids in a low share rate region with good accuracy, and a method for estimating apparent viscosity and a method for estimating torque using this viscosity model.SOLUTION: The present method com...

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Bibliographic Details
Main Authors OBATA TOMOHIKO, YOSHINO MASATO
Format Patent
LanguageEnglish
Japanese
Published 04.04.2022
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Summary:To provide a viscosity model determination method for estimating the apparent viscosity of non-Newtonian fluids in a low share rate region with good accuracy, and a method for estimating apparent viscosity and a method for estimating torque using this viscosity model.SOLUTION: The present method comprises: a step (a) for obtaining an estimation model 2 that indicates a relational expression between a shear rate and viscosity; a step (b) for observing a deformed shape 3 of a non-Newtonian fluid when elongated in a tensible test where the non-Newtonian fluid is elongated; a step (c) for performing numerical fluid analysis on the estimation model 2 obtained in the step (a) and predicting a deformed shape 4 of the non-Newtonian fluid when elongated in the tensile test; and a step (d) for comparing the deformed shape 3 of the non-Newtonian fluid observed in the step (c) with the deformed shape 4 of the non-Newtonian fluid predicted in the step (c), and adjusting the parameter of the estimation model 2 so that these shapes match and determining a viscosity model 5.SELECTED DRAWING: Figure 2 【課題】低せん断速度域において、非ニュートン流体の見かけ粘度を精度よく推定するための粘性モデルの決定方法、その粘性モデルを用いた見かけ粘度の推定方法、およびトルクの推定方法を提供する。【解決手段】本方法は、せん断速度と粘度との関係式を示す推定モデル2を得る工程(a)と、非ニュートン流体を伸ばす引張試験において、伸長時の非ニュートン流体の変形形状3を観察する工程(b)と、工程(a)で得た推定モデル2に対して数値流体解析を行い、引張試験における伸長時の非ニュートン流体の変形形状4を予測する工程(c)と、工程(b)で観察した非ニュートン流体の変形形状3と、工程(c)で予測した非ニュートン流体の変形形状4とを比較して、これらの形状が一致するように推定モデル2のパラメータを調整して粘性モデル5を決定する工程(d)とを有する。【選択図】図2
Bibliography:Application Number: JP20200159062