2015 Fiscal Year Final Research Report
Instabilities of a compound liquid jet in a static electric field and production of particles and capsules
| Project/Area Number |
24560194
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Keywords | 自由界面 / 非線形 / 表面張力 / 静電場 / エレクトロスピニング / エレクトロスプレー / 安定性 / 液体ジェット |
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| Outline of Final Research Achievements |
We analytically investigate breakup phenomena of a viscous liquid jet in a closely placed concentric sheath on which a static electric field is imposed. Taking account of a surrounding electric field of the jet, long wave nonlinear equations of the jet are derived. Evolution of the jet is numerically solved when a liquid emanates from a nozzle exit. It is shown that there exist three types of breakup modes - jetting, spraying and spinning - depending upon the parameters the electric Euler number Λ (=electric force/fluid inertial force) and the electric Peclet number Pe (=convective current/conductive current). Then, critical curves are found in the Λ-Pe parameter space, across which the mode is transferred from the jetting to the spinning through the spraying with the increase of Λ and/or the decrease of Pe. In particular, there is a range of Λ where a satellite drop appears with the increase of Λ for smaller Pe in the transition from jetting to spraying mode.
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| Free Research Field |
流体力学
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