Výsledky vyhledávání - "C. F. Barenghi"

Akademický článek

Strong quantum turbulence in Bose-Einstein condensates

Autor: H. A. J. Middleton-Spencer, A. D. G. Orozco, L. Galantucci, M. Moreno, N. G. Parker, L. A. Machado, V. S. Bagnato, C. F. Barenghi

Publikováno v: Physical Review Research, Vol 5, Iss 4, p 043081 (2023)

By combining experiments and numerical simulations which model the dynamics of shaken atomic Bose-Einstein condensates, we reveal the surprising nature of quantum turbulence in these systems. Unlike the tangles of vortex lines described in the superf

Externí odkaz: https://doaj.org/article/5056857c1d9b40a5a5cc21d3a88e796b

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Vinen’s Energy Barrier

Autor: C. F. Barenghi, P. V. E. McClintock, C. M. Muirhead

Publikováno v: Journal of Low Temperature Physics.

In 1963, the late W. F. (“Joe”) Vinen concluded, partly on intuitive grounds, that the ab initio creation of a quantized vortex line in superfluid $$^4$$ 4 He is impeded by an energy barrier. We place this prescient insight into context and revie

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3e4adf9ad1fabde22e9755e3d0d1c010
https://doi.org/10.1007/s10909-023-02945-7

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Types of quantum turbulence

Autor: C. F. Barenghi, H. A. J. Middleton-Spencer, L. Galantucci, N. G. Parker

We collect and describe the observed geometrical and dynamical properties of turbulence in quantum fluids, particularly superfluid helium and atomic condensates for which more information about turbulence is available. Considering the spectral featur

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e4d50e12d1dc2847e606cf502520dec6

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Superfluid Boundary Layer

Autor: G W, Stagg, N G, Parker, C F, Barenghi

Publikováno v: Physical review letters. 118(13)

We model the superfluid flow of liquid helium over the rough surface of a wire (used to experimentally generate turbulence) profiled by atomic force microscopy. Numerical simulations of the Gross-Pitaevskii equation reveal that the sharpest features

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::9870e3f7b4e398ee117b2d4ea44a10a4
https://pubmed.ncbi.nlm.nih.gov/28409989

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Visualizing Pure Quantum Turbulence in Superfluid 3He: Andreev Reflection and its Spectral Properties

Autor: A W, Baggaley, V, Tsepelin, C F, Barenghi, S N, Fisher, G R, Pickett, Y A, Sergeev, N, Suramlishvili

Publikováno v: Physical review letters. 115(1)

Superfluid 3He-B in the zero-temperature limit offers a unique means of studying quantum turbulence by the Andreev reflection of quasiparticle excitations by the vortex flow fields. We validate the experimental visualization of turbulence in 3He-B by

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::12980d4f739c99fd8ed5953fe03b8ba8
https://pubmed.ncbi.nlm.nih.gov/26182103

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Ions trapped below the surface of superfluid helium. I. The observation of plasma resonances, and the measurement of effective masses and ionic mobilities

Autor: J. Meredith, C.J. Mellor, C. F. Barenghi, C.M. Muirhead, W. F. Vinen, P. K. H. Sommerfeld

Publikováno v: Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences. 334:139-172

The results are reported of experiments on two-dimensional pools of positive and negative ions trapped below the surface of superfluid 4 He. The results of detailed computations on the static characteristics of an ion pool are presented, from which i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::48e43eab1fc875fd879ef621280b810d
https://doi.org/10.1098/rsta.1991.0005

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Turbulence in Pipe Flow of Helium II

Autor: D. J. Melotte, C. F. Barenghi

Publikováno v: Fluid Mechanics and Its Applications ISBN: 9789401061513

Our concern is the turbulent flow of Helium II - the quantum phase of liquid Helium. Turbulence in Helium II manifests itself as a disordered system of superfluid vortex lines, called the vortex tangle. The vortex tangle is an interesting state of di

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::af70dc6b684a8f42dffda3edb14f360a
https://doi.org/10.1007/978-94-011-5118-4_21

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Vortex knots

Autor: R. L. Ricca, D. C. Samuels, C. F. Barenghi

Publikováno v: Fluid Mechanics and Its Applications ISBN: 9789401061513

In this paper we present new results concerning the evolution and stability of vortex knots in the context of the Euler equations. For the first time, since Lord Kelvin’s original conjecture of 1875, we have direct numerical evidence of stability o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf2b80a4a0c6c22d852ec9220da74574
http://hdl.handle.net/10281/100220

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