期刊
PHYSICS OF FLUIDS
卷 27, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4935881
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资金
- National Natural Science Foundation of China [51376084, 51006047]
- Natural Science Foundation of Jiangsu Province [BK20150511]
- Graduate Student Innovation Projects of Jiangsu Province [GSIPJP CXZZ13_0676]
A detailed experimental study on the evolution of charged droplet formation and jet transition from a capillary is reported. By means of high-speed microscopy, special attention has been paid to the dynamics of the liquid thread and satellite droplets in the dripping mode, and a method for calculating the surface charge on the satellite droplet is proposed. Jet transition behavior based on the electric Bond number has been visualized, droplet sizes and velocities are measured to obtain the ejection characteristic of the spray plume, and the charge and hydrodynamic relaxation are linked to give explanations for ejection dynamics with different properties. The results show that the relative length is very sensitive to the hydrodynamic relaxation time. The magnitude of the electric field strength dominates the behavior of coalescence and noncoalescence, with the charge relationship between the satellite droplet and the main droplet being clear for every noncoalescence movement. Ejection mode transitions mainly depend on the magnitude of the electric Bond number, and the meniscus dynamics is determined by the ratio of the charge relaxation time to the hydrodynamic relaxation time. (C) 2015 AIP Publishing LLC.
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