Flow of Dilute Colloidal Dispersions in Water through a Small Orifice

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概要

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• Fluctuation of flows through a small orifice has been measured for water and two kinds of colloidal dispersions including fine particles about 100 nm in diameter with 1 % volume fraction in water. In this volume fraction, a surface potential of the particles is composed of an electrostatic repulsion and a van der Waals attraction and it affects flow properties. Experiments clarify that a specific flow instability occurs for water at the Reynolds number about 60, and the dispersion of polystyrene particles having strong repulsion increases the specific flow instability in low salt concentrations(LSC) but makes it disappear in high salt concentrations(HSC). Meanwhile, it is found that the dispersion of silica particles having strong attraction is stable in flows except the specific flow instability in LSC but it suppresses the specific flow instability in HSC as in the case of polystyrene particles. Criterion whether the orifice flow is stable or not is predicted by comparison of the second minimum location of the surface potential and the mean surfaces distance of the particles.

• 一般社団法人　日本レオロジー学会の論文

著者

• Narumi Takatsune

  Mechanical And Production Engineering Faculty Of Engineering Niigata University

• Toga Shinji

  Department of Electronic Control Engineering, Toyama National College of Maritime Technology

• Hasegawa Tomiichi

  Mechanical and Production Engineering, Faculty of Engineering, Niigata University

• Hasegawa Tomiichi

  Mechanical And Production Engineering Faculty Of Engineering Niigata University

関連論文

• Micro-Flow Control and Micropump by Applying Electric Fields through a Porous Membrane
• Drag Reduction in the Flow of Aqueous Solutions of Detergent Through Mesh Screens
• Flow of Dilute Colloidal Dispersions in Water through a Small Orifice
• Flow of Dilute Colloidal Dispersions in Water through a Small Orifice

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