ライブラリ登録: Guest
Begell Digital Portal Begellデジタルライブラリー 電子書籍 ジャーナル 参考文献と会報 リサーチ集
Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN 印刷: 0276-1459
ISSN オンライン: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v17.i4.20
pages 321-342

SOME APPLICATIONS OF LASER TRAPPING ON THE DYNAMICS OF MICROBUBBLES

H. Takahira
Dept. of Energy Systems Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan
T. Nagata
Graduate Student, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan
T. Hozumi
Graduate Student, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan

要約

The growth or shrinkage of a laser-trapped microbubble and the merger of microbubbles are observed with a high-speed camera. We investigate the influence of gas diffusion on the stability of trapped or merged microbubbles. Two kinds of equilibrium radii are observed for shrinking microbubbles. The first one is related to the equilibrium surface concentration of surfactant. The other is related to the decrease of the surface tension due to the compression of the surface area at the maximum surfactant concentration. The experimental results are compared with numerical solutions by taking the influence of the variation of surface tension on the gas diffusion into account. The simulations agree with the experimental results. The laser trapping technique is also applied to the motion of a microbubble in a shear flow. We observe the motion of a microbubble initially trapped in a narrow channel under shear flows. It is shown that as the radius of a microbubble becomes small, the bubble escapes from the laser trap being more repelled by the optical force. The oscillatory translation, which is induced by the rotation of the laser cone, is observed when the bubble is inside the laser cone. The theoretical predictions in which the buoyancy force, the fluid dynamics forces and the optical force are taken into account agree with the experiments.


Articles with similar content:

THE POSSIBILITY OF FORMATION OF SURFACE AND BULK NANOBUBBLES
Nanoscience and Technology: An International Journal, Vol.10, 2019, issue 1
Yu. K. Levin, Semen I. Koshoridze
GRAVITY EFFECT ON EVAPORATION AND INTERFACIAL DEFORMATIONS IN NONISOTHERMAL LIQUID FILM MOVED BY A GAS FLOWIN A MICROGAP
Interfacial Phenomena and Heat Transfer, Vol.2, 2014, issue 1
Vladimir Kuznetsov, Yulia O. Kabova, Oleg A. Kabov
GROWTH AND DETACHMENT OF CARBON DIOXIDE BUBBLES ON A HORIZONTAL POROUS SURFACE WITH A UNIFORM MASS INJECTION
ICHMT DIGITAL LIBRARY ONLINE, Vol.13, 2008, issue
Wen-Bin Tien, Shong-Leih Lee
Lagrangian Model of Oil Slick Spreading
International Journal of Fluid Mechanics Research, Vol.30, 2003, issue 1
Vladimir S. Maderich, L. I. Koziy
THE MECHANISM OF COMPONENT FORMATION OUT OF THE MAIN PULSE OF A RADIO PULSAR. II. THE INTERPULSE
Radio Physics and Radio Astronomy, Vol.1, 2010, issue 1
S. A. Petrova