title: Bubble motions confined in a microspace observed with stroboscopic technique.
abstract: Dynamic motions of gas bubble confined in a microspace, i.e., in a channel of a microreactor, were observed with a video microscope and stroboscopic technique using a light emitting diode operated in a pulsed mode. There are many important phenomena related to the bubble dynamics synchronized with ultrasonic wave and continued for more than a few minutes. With the stroboscopic technique, the time-expanded bubble motions synchronized with ultrasound wave and the real time background images can be simultaneously observed. A number of interesting phenomena resulting from the dynamic motions of a microbubble in a microspace were observed; nonspherical bubble oscillation, rectified diffusion, emergence of cavitation, and microstreaming of different patterns depending on the input power of ultrasound. The observation technique described in this investigation could be a convenient tool for taming the bubble under a microscope to investigate the bubble dynamics in detail.
authors.affiliation: Ultrasonic Processing Group, Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan. Electronic address: y.iida@aist.go.jp.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Iida
authors.affiliation: Ultrasonic Processing Group, Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Tuziuti
authors.affiliation: Ultrasonic Processing Group, Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan.
authors.forename: Kyuichi
authors.initials: K
authors.lastname: Yasui
authors.affiliation: Ultrasonic Processing Group, Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan.
authors.forename: Atsuya
authors.initials: A
authors.lastname: Towata
authors.affiliation: Ultrasonic Processing Group, Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan.
authors.forename: Teruyuki
authors.initials: T
authors.lastname: Kozuka