Dynamic viscoelasticity of an er fluid in oscillatory slit flow and its ER micro-structural mechanism

Sheila L. Vieira, Ryuji Aizawa, Masami Nakano

研究成果: Conference article査読

抄録

An electrorheological fluid composed of sulfonated polymer particles in insulating oil is analyzed on nonlinear dynamic viscoelasticity in oscillatory slit flow. The viscoelastic properties are determined as a function of the electric field, the fluid strain amplitude and the oscillation frequency, and changes in the ER microstructure are studied by direct observation performed by an optical microscope. The results showed that the viscoelastic properties of the ER fluid remarkably depend on the electric field strength and on the strain amplitude. However, no dependence on the oscillation frequency was observed in the range of 2.5 to 6.9 Hz. These dependencies are explained based on the formation and deformation of ER particle clusters that span the electrodes under oscillatory slit flow. All the results are discussed in terms of pre-yield, yield and post-yield region.

本文言語English
ジャーナルSAE Technical Papers
DOI
出版ステータスPublished - 1998 1月 1
外部発表はい
イベント7th International Mobility Technology Conference and Exhibit, SAE BRASIL 98 - Sao Paulo, Brazil
継続期間: 1998 11月 91998 11月 11

ASJC Scopus subject areas

  • 自動車工学
  • 安全性、リスク、信頼性、品質管理
  • 汚染
  • 産業および生産工学

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