, Volume 12, Issue 3, pp 267-274

Enhancement of mixing by microbubble emission boiling in a microfluidic device

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The effect of microbubble emission boiling (MEB) on the mixing of two fluids in a microfluidic device was studied experimentally. When MEB occurred on an electric heater made of a platinum wire with a diameter of 30 micrometers, the mixing of the two fluids increased markedly. However, nucleate boiling had no significant effect on the mixing. A high-speed video showed that the very rapid growth and collapse of micro boiling bubbles on the heater causes the strong mixing of the two fluids. The coexistence of highly superheated and highly subcooled water near the heater seems to be the reason for such enhanced mixing.

Hiroharu Kato: He received his M.Sc (Eng.) in Mechanical Engineering in 1963 from University of Tokyo. He also received his Ph.D. in Mechanical Engineering in 1966 from University of Tokyo. He worked at the Department of Naval Architecture, later the Department of Environmental & Ocean Engineering, University of Tokyo until 1999. He was professor at the Department of Mechanical Engineering, Toyo University in 1999–2009. His research interests are cavitation, environmental engineering and energy engineering.
Masayoshi Yamaguchi: He received his M.Sc. (Eng.) degree in Mechanical Engineering in 2007 from Toyo University. At present, he works for Ageo East Junior High School.