Dynamics and transport related to jets from bursting bubbles with immiscible compound surfaces
- Event Type
- Seminar/Symposium
- Sponsor
- Mechanical Science and Engineering
- Location
- 4100 Sidney Lu Mechanical Engineering Building
- Date
- Dec 11, 2025 4:00 pm
- Speaker
- Zhengyu Yang, Mechanical Science and Engineering, University of Illinois
- Contact
- Amy Rumsey
- rumsey@illinois.edu
- Phone
- 217-300-4310
- Views
- 2
- Originating Calendar
- MechSE Seminars
Abstract
Bubble bursting jets play a central role in mass and momentum transfer across interfaces, transporting chemical and biological contaminants into the atmosphere as aerosols. Despite their importance for global climate and public health, the influence of contaminants adsorbed at the bubble surface on the jet properties remains insufficiently understood. In this talk, I will present our recent progress on mass transport associated with the bursting of bubbles coated by an immiscible compound layer. First, using high-speed imaging, simulations, and theoretical analysis, we identify the conditions under which an immiscible compound surface enables the formation of a very thin and fast singular jet. We then investigate the resulting jet size in general oil-coated bubble bursting by developing a linearized wave-damping model and proposing a revised Ohnesorge number with a scaling relation that captures the jet radius across a wide range of coating viscosities and thicknesses. Then, we also report the entrainment of an immiscible droplet driven by a downward jet and derive a scaling law that predicts the entrained droplet size. Together, these results not only advance the fundamental understanding of contaminated bubble bursting, but also provide guidance and modeling constraints for bubble-mediated contaminant transport in natural and industrial settings.
About the Speaker
Zhengyu Yang is a doctoral candidate in the Department of Mechanical Science and Engineering at the University of Illinois Urbana-Champaign, working in the Fluids, Interfaces & Transport (FIT) Laboratory under the supervision of Prof. Jie Feng. His research interests include fluid dynamics and interfacial phenomena related to bubble dynamics. His doctoral work focuses on experimental and theoretical investigations of bubble bursting dynamics at compound surfaces, including oil-coated and protein-laden surfaces. He is a recipient of the Warren W. Yee Memorial Fellowship (2024) and the Hassan Aref Memorial Award for Theoretical and Applied Mechanics (2022).
Host: Professor Jie Feng