Inviscid Partial Coalescence from Bubbles to Drops

ORAL

Abstract

Coalescence of bubbles (drops) not only coarse the bubble (drop) sizes, but sometimes produces satellite bubbles (droplets), known as partial coalescence. To explore links between the drop and bubble cases, we experimentally study the partial coalescence of pressurized xenon gas bubbles in nano de-ionized water using high-speed video imaging. The size of these satellites relative to their mother bubbles is found to increase with the density ratio of the gas to the liquid. Moreover, sub-satellite bubbles are sometimes observed, whose size is also found to increase with the density ratio, while keeps about one quarter of the primary satellite. The time duration from start of the coalescence to formation of the satellites, scaled by the capillary time, increases with the density ratio too. In addition, as the size ratio of the father bubble to the mother bubble increases moderately, their coalescence proceeds faster and the sub-satellite is prone to form and relatively larger.

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Authors

  • F.H. Zhang

    Singapore-MIT Alliance, National University of Singapore, Singapore

  • P. Taborek

    University of California, Irvine, University of California-Irvine, Department of Physics and Astronomy, University of California, Irvine, California, USA

  • Justin Burton

    University of Chicago, James Franck Institute, University of Chicago, Chicago, Illinois, USA, James Franck Institute, University of Chicago

  • B.C. Khoo

    Singapore-MIT Alliance, National University of Singapore, Singapore

  • K.M. Lim

    Singapore-MIT Alliance, National University of Singapore, Singapore

  • Sigurdur Thoroddsen

    King Abdullah University of Science and Technology, Thuwal, Saudi Arabia, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia, Division of Physical Sciences and Engineering, KAUST, Saudi Arabia, KAUST