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Proceedings Paper

Dynamics of thermally generated microbubbles
Author(s): Ujitha Abeywickrema; Chenglong Zhao; Partha Banerjee
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Paper Abstract

Forces acting on thermally generated microbubbles are studied by deriving a general force model. Microbubbles can be steered by moving the laser beam. In previous work, it has been shown that the attractive thermo-capillary force on the microbubble is much larger than the repulsive optical force. Thus the microbubble is attracted toward the laser beam, which has been also observed experimentally. In this work, dynamics of a microbubble is studied by steering microbubbles with a known constant velocity. Thermocapillary force on the microbubble is calculated using a developed model which is based on the experimental velocity values and compared with the thermo-capillary force values obtained from the theory. The effect of the viscous and friction forces are also considered. Microbubbles are generated in a thin container as in our previous work and the container is placed on a motorized translation stage. After the bubble is generated and trapped by the focused laser beam the translational stage is moved with a known velocity until the microbubble is separated from the beam. Then the two thermo-capillary forces are compared as a function of the microbubble (translation stage) velocity.

Paper Details

Date Published: 19 February 2018
PDF: 6 pages
Proc. SPIE 10520, Laser-based Micro- and Nanoprocessing XII, 105201S (19 February 2018); doi: 10.1117/12.2292069
Show Author Affiliations
Ujitha Abeywickrema, Univ. of Dayton (United States)
Chenglong Zhao, Univ. of Dayton (United States)
Partha Banerjee, Univ. of Dayton (United States)

Published in SPIE Proceedings Vol. 10520:
Laser-based Micro- and Nanoprocessing XII
Udo Klotzbach; Kunihiko Washio; Rainer Kling, Editor(s)

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