Abstract: In this informal talk I discuss several problems that arise in experimental interfacial fluid mechanics that I explored during my PhD research. In the first chapter, I study the valence dependence of diffusiophoresis, a small-scale phenomenon that can be used to manipulate particles.  The other three chapters explore aspects of the motion of drops on fibers exposed to a cross flow using PIV, brightfield, and fluorescence imaging. First, I show that drops wetting parallel fibers in a uniform cross flow can interact aerodynamically, both with their downstream and upstream neighbors, leading to a variety of behaviors, including alignment.  Second, I build on this knowledge to search for conditions that promote coalescence of drops on fibers and rationalize observed behaviors. Finally, I study mixing inside and between drops. As drops move on the fibers, they deposit thin films which are intercepted by other drops. I use dye to visualize the exchange of fluid and rationalize the mixing with analytical models for the deposited films and the internal flows of the drops.

Speaker: Jessica L. Wilson

Introduction of speaker: Dr. Jessica Wilson recently earned her Ph.D. under the supervision of Professor Howard Stone at Princeton University. During her doctoral studies, she published first-author papers in both Nature Physics—focusing on aerodynamic interactions of drops on fibers—and Langmuir, where she explored diffusiophoresis. With a background that spans undergraduate chemistry, biochemistry research at MIT, and mechanical engineering at Princeton, Dr. Wilson brings an interdisciplinary perspective to her work. She also has some proficiency in Mandarin (她也会一点汉语) and hopes to further improve her skills by living and working in China, where she is currently visiting to explore postdoctoral and professional opportunities.

审核：刘有晟、游小清