globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025805
论文题名:
Breakup modes of the drops suspended in a vertical wind tunnel in presence of the horizontal electric field
作者: Bhalwankar R.; Deshpande C.G.; Kamra A.K.
刊名: Journal of Geophysical Research: Atmospheres
出版年: 2017
卷: 122, 期:3
起始页码: 1838
结束页码: 1849
语种: 英语
英文关键词: drop breakup ; extreme elongation ; mode of breakup ; wind tunnel experiments
Scopus关键词: curvature ; deformation ; diameter ; droplet ; electric field ; experimental study ; oscillation ; photography ; wind tunnel
英文摘要: The influence of strong horizontal electric field (EH) on different stages of deformation and eventual breakup of the large water drops of 6.6, 7.0, and 7.25 mm diameter has been observed in a vertical wind tunnel using high-speed photography. Dumbbell, filament, and bag modes of drop breakup are observed when EH = 0. However, drops elongate in horizontal direction, mostly develop sharp curvature at their ends, eject a fine jet spray of tiny droplets, and ultimately break up into several droplets in EH = 500 kV m−1. Extreme elongation up to 29 mm is observed for a 7.0 mm diameter drop. Results show that the breakup time, i.e., the time from the drop's extreme prolate shape to its breakup in its final oscillation, ranges from 13 to 41 ms when EH = 0 and 57–105 ms when EH = 500 kV m−1. So although the lifetime of the drop since its suspension to breakup is reduced, its elongation and breakup time increase in EH. It suggests that the effect of EH in final oscillation before breakup overcomes the effect of hydrodynamic and aerodynamic forces in elongating the drop. Also, no breakup of bag type is observed in EH = 500 kV m−1. Moreover, the fragments formed after the drop breakup and tiny droplets ejected by their fragments carry electrical charges of polarity determined by the induced charge on the parent drop in EH. The significance of the results is discussed in modifying the drop growth and the radar echo-precipitation relationships in thunderclouds. ©2017. American Geophysical Union. All Rights Reserved.
资助项目: "The Indian Institute of Tropical Meteorology, Pune, India, is fully funded by the Ministry of Earth Sciences (MoES), Government of India, New Delhi. The data used in this paper have been generated during our wind tunnel experiments at IITM and are available with authors. Data may be shared through possible collaboration by contacting corresponding authors at their e-mail (rohini@tropmet.res.in ; cgdesh@tropmet.res.in ; kamra@tropmet.res.in). Authors acknowledge the director, IITM for the encouragement in carrying out this work. A.K.K. acknowledges the support under the INSA (Indian National Science Academy) Honorary Scientist programme.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62705
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Indian Institute of Tropical Meteorology, Pune, India

Recommended Citation:
Bhalwankar R.,Deshpande C.G.,Kamra A.K.. Breakup modes of the drops suspended in a vertical wind tunnel in presence of the horizontal electric field[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(3)
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