Dr Xuehua Zhang - Summit Speaker Series - August 31, 2016

Dr. Xuehua Zhang 

    

Associate Professor RMIT University, Melbourne, Australia

Physics of Fluids group, Department of Applied Physics and J. M. Burgers Centre for Fluid Dynamics, University of Twente, 7500 AE Enschede, The Netherlands

Email: Xuehua.zhang@rmit.edu.au

 

Lecture #2: Competing microscopic bubbles and droplets

August 31, 2016

2:00 pm 8-207 Donadeo Innovation Centre for Engineering

Nanoscale gas bubbles and oil droplets can be produced on a hydrophobic surface in contact with water. They can have significant influence on a range of interfacial phenomena. For example, the nanobubbles may facilitate the long-ranged interactions between surfaces, give rise to hydrodynamic slip on the boundary, or initiate the rupture of thin liquid films. Experimental results have shown the pinning effects on the stability, growth and dissolution of nanobubbles and nanodroplets. Theoretical calculation has also revealed the stable state of a pinned single bubble under a mild gas oversaturation.  However, the cooperative effects among multiple bubbles or droplets still remain elusive. The talk will discuss the basic principle for the symmetrical arrangement of bubbles and droplets driven by the collective interactions during their growth. We will also show and explain how the bubbles and droplets acquire the symmetrical spatial arrangement through self-organization during their competitive growth and what is the implication of the competition on the overall growth rate.