RESEARCH PAPER
Fluidic Generator Of Microbubbles – Oscillator With Gas Flow Reversal For A Part Of Period
1
Institute of Thermomechanics v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 1402/5, 182 00 Praha 8, Czech Republic
Submission date: 2015-06-10
Acceptance date: 2015-12-14
Online publication date: 2015-12-30
Publication date: 2015-12-01
Acta Mechanica et Automatica 2015;9(4):195-203
KEYWORDS
ABSTRACT
Paper presents a fluidic device developed for generation of small (less than 1 mm in diameter) microbubbles in a liquid from gas passing gas through small passages. Until now the bubbles are larger than the size of aerator passage exits so that making the passages smaller did not result in obtaining the desirable microbubbles. Analysis of high-speed camera images (obtained with a special lens of large working distance) have shown show that the large bubble size is caused by slow ascent motion of very small bubbles so that they get into mutual contact and grow by conjunction. The solution is to pulsate the supplied gas flow by a no-moving-part fluidic oscillator. The generated small bubble is moved back into the aerator passage where it is for a part of oscillation period protected from the conjunction with other, previously generated microbubbles.
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