<abstract xmlns="http://www.w3.org/1999/xhtml"><p>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.</p></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.

Fluidic Generator Of Microbubbles – Oscillator With Gas Flow Reversal For A Part Of Period

Institute of Thermomechanics v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 1402/5, 182 00 Praha 8, Czech Republic

Acta Mechanica et Automatica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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...

Fluidic Generator Of Microbubbles – Oscillator With Gas Flow Reversal For A Part Of Period

Published Online: Dec 30, 2015

Page range: 195 - 203

Received: Jun 10, 2015

Accepted: Dec 14, 2015

DOI: https://doi.org/10.1515/ama-2015-0032

Keywords
Fluidics, Oscillators, Microbubbles, U-Tube Resonator

© 2015 Bialystok University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fluidic Generator Of Microbubbles – Oscillator With Gas Flow Reversal For A Part Of Period

Published Online: Dec 30, 2015

Page range: 195 - 203

Received: Jun 10, 2015

Accepted: Dec 14, 2015

DOI: https://doi.org/10.1515/ama-2015-0032

KeywordsFluidics, Oscillators, Microbubbles, U-Tube Resonator

© 2015 Bialystok University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Fluidics, Oscillators, Microbubbles, U-Tube Resonator