4.7 Article

Shock induced aerobreakup of a droplet

期刊

JOURNAL OF FLUID MECHANICS
卷 929, 期 -, 页码 -

出版社

CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2021.860

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drops and bubbles

资金

  1. IGSTC (Indo-German Science and Technology Center) [SP/IGSTC-18-0003]

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The multiscale dynamics of shock-droplet interaction is crucial for understanding droplet atomisation due to external airflow. The interaction phenomena are classified into wave dynamics and droplet breakup dynamics, primarily observing different breakup modes for the studied range of Weber numbers.
The multiscale dynamics of a shock-droplet interaction is crucial in understanding the atomisation of droplets due to external airflow. The interaction phenomena are classified into wave dynamics (stage I) and droplet breakup dynamics (stage II). Stage I involves the formation of different wave structures after an incident shock impacts the droplet surface. These waves momentarily change the droplet's ambient conditions, while in later times they are mainly influenced by shock-induced airflow. Stage II involves induced airflow interaction with the droplet that leads to its deformation and breakup. Primarily, two modes of droplet breakup, i.e. shear-induced entrainment and Rayleigh-Taylor piercing (RTP) (based on the modes of surface instabilities) were observed for the studied range ofWeber numbers (We similar to 30-15 000). A criterion for the transition between two breakup modes is obtained, which successfully explains the observation of RTP mode of droplet breakup at high Weber numbers (We similar to 800). For We > 1000, the breakup dynamics is governed by the shear-induced surface waves. After formation, the Kelvin-Helmholtz waves travel on the droplet surface and merge to form a liquid sheet near the droplet equator. Henceforth, the liquid sheet undergoes breakup processes via nucleation of several holes. The breakup process is recurrent until the complete droplet disintegrates or external drag acting on the droplet is insufficient for further disintegration. At lower Weber numbers, the droplet undergoes complete deformation like a flattened disk, and a multibag mode of breakup based on RTP is observed.

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