Superfluidity provides new insights into turbulence

Credit: University of Queensland

Exotic liquid turbulence, known as superfluidity, fuses to form large vortices, similar to the formation of cyclones in a turbulent atmosphere.

New research by the University of Queensland team, the ARC Center of Excellence for Engineered Quantum Systems (EQUS), and the ARC Center of Excellence in Future Low-Energy Electronics Technologies (FLEET) are important for new technological applications of superfluidity. , Precision sensing etc.

Lead author and theorist Dr. Matt Reeves said the team’s results provide an experimental test of the theory 70 years ago, which is a model of two-dimensional vortex equilibrium by Nobel laureate Lars Onsager.

“Large, long-lived vortices, such as cyclones and the Great Red Spot of Jupiter, are often formed from turbulent fluid flows, such as the planet’s atmosphere,” he said.

“Onsager’s model explains the existence of these structures, but so far experiments have tended to contradict expectations,” he said.

“The key issue is that most fluids are viscous, which means they resist the flow.

“Therefore, non-viscous superfluidity is an ideal candidate for realizing the Onsager model.”

Dr. Tyler Neely, who led the experiment, said the team studied the behavior of vortices in superfluidity known as the Bose-Einstein condensation produced by the extreme cooling of the gas in the rubidium atom. Cold temperature..

“We created a superfluid thin disc and used a laser to inject a vortex into a carefully designated location,” he said.

“The vortices mixed rapidly and merged into a single large cluster in just a few seconds. Turbulent atmosphere..

“But the most exciting thing was the amazing match between theory and experiment. Superfluid very well.

“Our results suggest that superfluidity can be used to learn new things about turbulence and are essential for the development of precision sensors based on superfluidity.”

This work answers some of the important unanswered questions from Previous work By the team on the vortex cluster released in 2019 Chemistry..

New research is published at Physical Review X..

Engineering researchers develop new explanations for vortex formation in 2D superfluidity

For more information:
Matthew T. Reeves et al, Turbulence relaxation to equilibrium in two-dimensional quantum vortex gas, Physical Review X (2022). DOI: 10.1103 / PhysRevX.12.011031

Quote: Superfluids provides new insights on turbulence (February 17, 2022) taken from https: // on February 17, 2022. Offers.

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Superfluidity provides new insights into turbulence

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