Core–shell droplet generation device using a flexural bolt-clamped langevin-type ultrasonic transducer

Kentaro Omori, Nozomu Fujimoto, Takefumi Kanda, Shuichi Wakimoto, Norihisa Seno

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Droplets with a core–shell structure formed from two immiscible liquids are used in various industrial field owing to their useful physical and chemical characteristics. Efficient generation of uniform core–shell droplets plays an important role in terms of productivity. In this study, monodisperse core-shell droplets were efficiently generated using a flexural bolt-clamped Langevintype transducer and two micropore plates. Water and silicone oil were used as core and shell phases, respectively, to form core–shell droplets in air. When the applied pressure of the core phase, the applied pressure of the shell phase, and the vibration velocity in the micropore were 200 kPa, 150 kPa, and 8.2 mm/s, respectively, the average diameter and coefficient of variation of the droplets were 207.7 μm and 1.6%, respectively. A production rate of 29,000 core–shell droplets per second was achieved. This result shows that the developed device is effective for generating monodisperse core–shell droplets.

Original languageEnglish
Article number55
Issue number3
Publication statusPublished - Mar 2021


  • Core-shell droplet
  • Microfluidic device
  • Ultrasonic transducer

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Control and Optimization


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