Electro-Rheological Response of Liquid Crystals under Oscillatory Squeeze Flow(<Special Issue>Advanced Fusion of Functional Fluids Engineering)

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概要

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• We have investigated the electro-rheological (ER) properties of liquid crystals in an oscillatory squeezing flow. A Micro Fourier Rheometer was utilized to estimate the complex viscosity and phase shift. A clear dip in the phase angle was observed, centred around a frequency which increased with electric field strength. It was found that this critical frequency was proportional to the inverse of the response time required for the liquid crystal molecules to align under the electric field. Similar ER effects to those observed under steady shearing were obtained in the oscillatory flow, but the ER effect at high frequency is smaller than that under no electric field. In other words, a negative ER effect was obtained under low electric fields. A rheological model for the dynamic response was obtained through the control theory and the transfer function thus derived will be useful for estimating the output response in a flow or motion control system.

• 一般社団法人日本機械学会の論文
• 2005-08-15

著者

• See H

  Department Of Mechanical And Mechatronic Engineering The University Of Sydney

• See Howard

  シドニー大工

• See Howard

  Department Of Applied Physics Faculty Of Engineering Nagoya University

• HASEGAWA Tomiichi

  Department of Mechanical and Production Engineering, Faculty of Engineering, Niigata University

• NARUMI Takatsune

  Department of Mechanical and Production Engineering, Faculty of Engineering, Niigata University

• Yamaguchi Yasuhiro

  Department Of Agricultural Biochemistry And Biotechnology Tottori University

• Hasegawa Tomiichi

  Department Of Mechanical And Production Engineering Faculty Of Engineering Niigata University

• Yamaguchi Yasuhiro

  Department Of Mechanical And Production Engineering Faculty Of Engineering Niigata University

• Narumi T

  Mechanical And Production Engineering Faculty Of Engineering Niigata University

• Narumi Takatsune

  Department Of Mechanical And Production Engineering Faculty Of Engineering Niigata University

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