Breakup and coalescence of bubbles and droplets

Liquid-gas and liquid-liquid dispersions form part of many technological and biotechnological processes. In turbulent fluid flow, fluid particles (bubbles or droplets) break and coalesce to form a complex multiphase system. Understanding the mechanism of particle breakup and coalescence is important because theoretical models describing this processes are required for the numerical modelling of complex, multiphase systems. This doctoral thesis will focus on experimentally studying the dynamic behaviour of bubbles or droplets during controlled fluid particle breakup and coalescence, with the aim of quantifying quantities that are important for numerical models, as well as determining the size distribution of newly formed particles. The mechanisms of breakup and coalescence will be studied in relation to various selected hydrodynamic and physicochemical conditions of the system. The workplace is well equipped for studying bubble/​drop breakup and coalescence. Apparatus is available for the controlled formation of bubbles, toroidal vortices and bubble/​drop interactions. The necessary control and evaluation programmes are also available.

Requirements for applicants: A university education (master’s degree) in chemical or mechanical engineering; the ability to work systematically and creatively as part of a team; an interest in experimental work.

Required education and skills

• Master degree in in chemical or mechanical engineering;
• systematic and creative approach to scientific problems;
• interest in experimental work.