Abstract
In classical fluids, the Weber number is a dimensionless parameter that characterizes the flow of a multiphase fluid. The superfluid analogy of a classical multiphase fluid can be realized in a system of two or more immiscible Bose-Einstein condensates. These superfluid mixtures have been shown to display a wider variety of exotic dynamics than their single component counterparts. Here we systematically study the dynamics of a binary immiscible Bose-Einstein condensate in two dimensions, where a small bubble of the second component is used to “stir” the first component. We begin by rigorously mapping out the critical velocity for vortex shedding as a function of the size of the bubble, in analogy to the critical velocity of a laser spoon. Observing that the dynamics of the system depend on the initial size and velocity of the bubble, we then show that a dimensionless parameter with the same form as the Weber number accurately predicts the resulting bubble fragmentation.
Published by the American Physical Society
2024
Funder
Newcastle University
Engineering and Physical Sciences Research Council
Publisher
American Physical Society (APS)