Pozývame vás na prednášku s diskusiou prof. Jonathan J. Wylie z City University of Hong Kong Stability of drawing of micro-structured optical fibres. Prednáška je otvorená pre študentov a zamestnancov FEI STU.
Kedy: 23. jún 2025, 10:00 | Kde: AB150
O čom bude prednáška:
We consider the stability of the drawing of a long and thin viscous thread with an arbitrary number of internal holes of arbitrary shape. Flows of this type are fundamental in the fabrication of micro-structured optical fibres that have the revolutionized the transmission of data and are extremely important in modern sensing. The thread evolves due to a complicated interaction between axial drawing, inertia, surface tension, thermal and pressurization effects. Despite the complicated geometry of the boundaries, we use asymptotic techniques to determine a particularly convenient formulation of the equations of motion that is well-suited to stability calculations. We use this formulation to show how the presence of internal holes affects the stability of the drawing process and address a longstanding question from the literature. We also consider the interactions between external cooling, surface tension and inner hole pressurization and show that these effects combine in a complicated way to produce counterintuitive behaviour. We carefully explore these effects and explain the underlying mechanisms.
O hosťovi:
Prof. Jonathan J. Wylie's research is focused on fluid mechanics, granular materials and other industrially motivated problems. He obtained his PhD and was subsequently awarded a Junior Research Fellowship from King's College, Cambridge. Before coming to CityU he spent time in Cornell University, Woods Hole Oceanographic Institution and the University of Toronto. He has worked extensively on the fluid mechanics of viscous threads and the dynamics of coupled partial differential equations. His research has been supported by the National Science Foundation (NSF) of USA, the Australian Research Council and the Research Grant Council (RGC) of Hong Kong. He is an associate editor of the "IMA Journal of Applied Mathematics.
Tešíme sa na vašu účasť!
