May 26, 2023
Osaka Metropolitan University
Keio University
<Highlights>
Successfully performed simultaneous calculations of the mutual influence between "vortices in an inviscid superfluid" and the "viscous normal fluid."
Successfully observed the shrinking of a quantized vortex ring in a superfluid through a visualization experiment.
Determined the most consistent model from multiple theoretical models based on experimental results.
Will contribute to the analysis of many superfluid phenomena in the future.
A research group, including Professor Makoto Tsubota and Project Assistant Professor Satoshi Yui (from the Graduate School of Science and the Nambu Yoichiro Institute of Theoretical and Experimental Physics at Osaka Metropolitan University) and Professor Hiromitsu Kobayashi (from the Department of Physics, Hiyoshi, Faculty of Law, and the Research and Education Center for Natural Sciences at Keio University), has investigated the interaction between quantized vortices (vortices in an inviscid superfluid) and the normal fluid (a viscous fluid) in superfluid liquid helium-4 at cryogenic temperatures through numerical simulations. Based on the experimental results from a team at Florida State University, including Professor Wei Guo, Postdoctoral Associate Yuan Tang, and Graduate Student Toshiaki Kanai, they have identified the most consistent model among several theoretical models.
The results of this research put an end to the long-standing question that has troubled many researchers in quantum hydrodynamics: "Which model is consistent with experimental results?" It is expected to provide new guidelines for future numerical simulations and analysis of many superfluid phenomena, thereby advancing the development of this research field.
For the full press release, please see below.