• Yin Nee Cheung Yin Nee Cheung
  • Teck Neng Wong Teck Neng Wong
  • Nam-Trung Nguyen Nam-Trung Nguyen

This letter reports a low frequency acoustic atomization technique with oscillatory extensiol flow around micropillars. Large droplets passing through two micropillars are elongated. Small droplets are then produced through the pinch-off process at the spindle-shape ends. As the actuation frequency increases, the droplet size decreases with increasing monodispersity. This method is suitable for in-situ mass production of fine droplets in a multi-phase environment without exterl pumping. Small particles encapsulation was demonstrated with the current technique.