Journal
JALA
Volume 15, Issue 3, Pages 163-171Publisher
SAGE PUBLICATIONS INC
DOI: 10.1016/j.jala.2010.01.012
Keywords
microfluidics; lab on a chip; micro total analysis system
Funding
- National Science Foundation [ECCS-0601470, ECCS-0725525, CMMI-0730460]
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When a gaseous bubble in liquid is excited by acoustic waves, it oscillates (expands and shrinks) at the wave frequencies and generates strong vortical flows around it, the so-called cavitational microstreaming. This article describes the development of a micropumping principle using cavitational microstreaming. The key idea is to place a capillary tube vertically above an oscillating bubble to collect the upward microstreaming flow. When the bubble is excited at its resonance frequency, it oscillates with surface undulations (surface wave mode) and pumps water through the tube. The performance of this pumping mechanism is experimentally studied using millimeter and microscale bubbles. The flow rate and generated pressure are measured in a variety of conditions. The measured results indicate that the present pump falls into the category of moderate-flow-rate and low-pressure type pumps. The present pump operates without physical connections or electrical wiring to the bubbles, implicating potential applications as implantable micropumps in many lab-on-a-chip type systems. (JALA 2010;15: 163-71)
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