Spontaneous motion of a droplet evolved by resonant oscillation of a vortex pair.
Spontaneous motion of a droplet evolved by resonant oscillation of a vortex pair.
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液滴的自发运动是由涡旋对的共振演化而来的。
DOI：
10.1103/physreve.79.031602
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Katsuroku Takahashi
中科院分区：
文献类型：
--
作者：
T. Ban;Y. Hatada;Katsuroku Takahashi
我们研究了在两种驱动力（溶质从液滴向周围介质的传质和连续向液滴提供溶液）作用下，液滴内部自组织流动模式形成中的耗散结构以及液滴的自发运动。当溶质浓度增加到超过一个临界值时，从液滴中喷射出一股射流（喷发）。类似的流动同时进入液滴（破裂），产生内部流动。由此产生的内部流动沿着液滴表面发展成两个漩涡。由于另一个涡旋的局部流动，每个涡旋沿着液滴表面沿圆形轨道运动，而连续的溶质喷发发生在涡旋对之外。整个液滴以与涡旋对相同的速度缓慢旋转。旋涡对随旋转而振荡，引起液滴随慢旋转而摆动。涡旋的运动类似于进动伴随着一个围绕固定点旋转的陀螺的章动。液滴运动的时间演化描述了一种叠加在长波上的短波模式。短波是由涡旋对的“章动”引起的，长波是由“进动”引起的。由于涡旋之间的相互作用，短波的振幅随时间而变化。涡旋对充当耦合振荡器。当长波的相速度与短波的群速度相等时，长波与短波的包络发生共振相互作用，显著改变液滴运动；突然间，液滴剧烈而有规律地快速旋转。
We studied dissipative structures in the pattern formation of self-organized flow inside a droplet and spontaneous motion of the droplet when two driving forces, mass transfer of a solute from the droplet to surrounding media and continuous supply of solution to the droplet, were applied. When solute concentration increases beyond a critical value, a jetlike flow erupts out of the droplet (eruption). A similar flow simultaneously enters the droplet (irruption), producing internal flow. The resulting internal flow develops into two vortices along the droplet surface. Each vortex moves in a circular orbit along the droplet surface by local flow due to the other vortex, while continuous solute eruptions occur out of the vortex pair. The entire droplet rotates slowly at the same velocity as the rotation of the vortex pair. The vortex pair then oscillates with rotation, inducing droplet wiggle with slow rotation. The vortex motion resembles precession accompanied by nutation of a spinning top about a fixed point. Temporal evolution of droplet motion describes a pattern of short waves superimposed on a long wave. Short waves are induced by "nutation" of the vortex pair, and the long wave by "precession." The amplitude of the short wave varies with time because of the interaction between vortices. The vortex pair acts as coupled oscillators. Resonance interaction can occur between the long wave and the envelope of short waves when the phase velocity of the long wave becomes equal to the group velocity of short waves, markedly changing droplet motion; vigorous and regular fast rotation of the droplet suddenly occurs.
油滴的李斯特菌样运动
DOI：
--
发表时间：
2006
期刊：
Chemistry Letters 35
影响因子：
--
作者：
Toyota;T.;et. al.
通讯作者：
et. al.
液滴运动的离子控制
DOI：
--
发表时间：
2006
期刊：
Chemistry Letters 35
影响因子：
--
作者：
清水紀芳;小泉直也;杉本麻樹;新居英明;関口大陸;稲見昌彦;伴 貴彦
通讯作者：
伴 貴彦
影响因子：
15
作者：
Hanczyc, Martin M.;Toyota, Taro;Sugawara, Tadashi
通讯作者：
Sugawara, Tadashi