Changes in Behavior of Microscale Multiphase Flows by Addition of Particles

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  • YAMAMOTO Ken
    大阪大学 大学院 理学研究科 宇宙地球科学専攻

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  • 微粒子懸濁によるマイクロ混相流の挙動変化

Abstract

<p>Marked changes in behavior of flowing interfaces induced by particles that were observed by the author are reviewed. The first phenomenon is related to the trap of particles on a liquid–gas interface, which is widely used to the formation of the colloidal crystals: a formation of a 3D-structured monolayer in a glass capillary is presented. The formation mechanism is also explained by means of the particle and the wall wettability. The second phenomenon is related to the long-ranged hydrodynamic interaction of particles: a case of droplets entering “concentration interfaces” of dyed water of particle suspension is presented. The droplet motion shows that the interface exerts the repulsive force if the interface is consisted of particle suspension. The magnitude of the repulsive force, which stems from the overlap of the Stokeslets generated by the migration of each particle, is estimated and showed that it is comparable to the force exerted on the droplets by the surrounding flow.</p>

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