Electronically steerable ultrasound-driven long narrow air stream

  title={Electronically steerable ultrasound-driven long narrow air stream},
  author={Keisuke Hasegawa and Liwei Qiu and Akihito Noda and Seki Inoue and Hiroyuki Shinoda},
  journal={Applied Physics Letters},
Acoustic streaming, which is the unidirectional movement of a medium driven by its internal intense acoustic vibrations, has been known for more than a century. Despite the long history of research, there have been no scientific reports on the creation of long stretching steerable airflows in an open space, generated by ultrasound. Here, we demonstrated the creation of a narrow, straight flow in air to a distance of 400 mm from an ultrasound phased array emitting a Bessel beam. We also… 

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