The Role of Magnetic Vortex Tubes in Stellar Outflows

The article is prepared for the centenary of the birth of Alexander Petrovich Merkulov. The stages of creating the theoretical basis of the vortex effect of energy separation of gases (the hypothesis of vortex interaction), and the creation and implementation of vortex devices based on the use of the vortex effect for aviation and medicine are considered. The role of Professor A.P. Merkulov in the study of characteristic features of the energy separation process in vortex tubes and practical application of the vortex effect in the USSR is shown. The works of ONIL-9 (KuAI-SGAU) headed by Alexander Petrovich Merkulov ensured the leading position of the Soviet school of thought in the field of vortex effect. These works contributed to the formation of modern understanding of the vortex effect and the successful beginning of industrial application of vortex apparatuses.

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A New Model for Stellar Magnetism

International Astronomical Union Colloquium ◽

10.1017/s0252921100020625 ◽

1993 ◽

Vol 138 ◽

pp. 284-290

Author(s):

P.F. Browne

Keyword(s):

Magnetic Field ◽

White Dwarfs ◽

Torsional Oscillation ◽

Magnetic Vortex ◽

The Sun ◽

Line Radiation ◽

Viscous Forces ◽

Electrons And Ions ◽

Ap Stars ◽

Vortex Tubes

AbstractDifferent drift velocities of electrons and ions in response to viscous forces exerted by neutral atoms generate current density j and magnetic field B, where B is proportional to vorticity ω of the fluid. Magnetic vortex tubes (MVTs) form arrays on a hierarchy of scales. MVTs are basic to the magnetism of all astrophysical systems, conferring a structure of aligned filaments. In the Sun a torsional oscillation generates oscillatory vorticity, and hence an oscillatory magnetic field. The same mechanism is proposed for the Ap stars, but with “pole-on” viewing. Resonance-line radiation pressure segregates elements within MVTs of Ap stars, where the anomalous concentrations are preserved. However, variation of the 30 MG magnetic fields of AM Her white dwarfs may be due to precession of an MVT. There is reason to attribute common magnetic flux to the Sun, Ap stars, white dwarfs and neutron stars

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The role of alumina in triggering stellar outflows

Proceedings of the International Astronomical Union ◽

10.1017/s1743921319004964 ◽

2018 ◽

Vol 14 (A30) ◽

pp. 406-407

Author(s):

David Gobrecht ◽

John Plane ◽

Stefan Bromley ◽

Leen Decin

Keyword(s):

Stellar Outflows

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Phenomena Involving Magnetic Vortex Tubes

Symposium - International Astronomical Union ◽

10.1017/s0074180900189776 ◽

1990 ◽

Vol 140 ◽

pp. 136-138

Author(s):

P.F. Browne

Keyword(s):

Cosmic Ray ◽

Magnetic Vortex ◽

Bipolar Outflows ◽

Acceleration Mechanism ◽

Vortex Tubes

Magnetic vortex tubes (MVTs) on a hierarchy of scales occur universally. On the largest scale they channel bipolar outflows of gas. A pinched region of MVT provides an acceleration mechanism capable of yielding the maximum cosmic ray energies.

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Identifying the tangle of vortex tubes in homogeneous isotropic turbulence

Journal of Fluid Mechanics ◽

10.1017/jfm.2019.487 ◽

2019 ◽

Vol 874 ◽

pp. 952-978 ◽

Cited By ~ 2

Author(s):

Shiying Xiong ◽

Yue Yang

Keyword(s):

Isotropic Turbulence ◽

Time Instant ◽

Small Scale ◽

Homogeneous Isotropic Turbulence ◽

Complex Flow ◽

Time Step ◽

Vortex Sheets ◽

Helical Geometry ◽

Vortex Tubes

We extend the vortex-surface field (VSF), whose isosurface is a vortex surface consisting of vortex lines, to identify vortex tubes and sheets in homogeneous isotropic turbulence. The VSF at a time instant is constructed by solving a pseudo-transport equation. This equation is convected by a given instantaneous vorticity obtained from direct numerical simulation. In each pseudo-time step, we develop a novel local optimization algorithm to minimize a hybrid VSF constraint, balancing the accuracy and smoothness of VSF solutions. This key improvement makes the numerical construction of VSFs feasible for arbitrarily complex flow fields, as a general flow diagnostic tool. In the visualization of VSF isosurfaces in decaying homogeneous isotropic turbulence, the initial curved vortex sheets first evolve into vortex tubes, and then the vortex tubes are stretched and tangled, constituting a complex network. Some vortex tubes exhibit helical geometry, which suggests the important role of vortex twisting in the generation of small-scale structures in energy cascade.

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Young Stellar Objects and Herbig-Haro Objects

Australian Journal of Physics ◽

10.1071/ph920487 ◽

1992 ◽

Vol 45 (4) ◽

pp. 487

Author(s):

WJ Zealey

Keyword(s):

Current Understanding ◽

Morphological Data ◽

Young Stellar Objects ◽

General Mechanism ◽

Stellar Objects ◽

Stellar Outflows

Our current understanding of Herbig-Haro objects and their relationship with young stellar outflows is reviewed. The role of multi-waveband observations in the visible, infrared and radio in the study of outflows is discussed with examples drawn from the HH1, HH24 and HH54 outflow complexes. The current theories are briefly considered in the light of spectroscopic and morphological data. It is concluded that although the general mechanism of outflows is understood, the details of the outflowing material's origin and the collimation mechanism remain largely unanswered.

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Quantized vortices in pionic superfluid

EPJ Web of Conferences ◽

10.1051/epjconf/202225810008 ◽

2022 ◽

Vol 258 ◽

pp. 10008

Author(s):

Oleg Teryaev ◽

Valentin Zakharov

Keyword(s):

Experimental Investigation ◽

Heavy Ion ◽

Quantized Vortices ◽

The Other ◽

Vortex Rings ◽

Vortex Sheets ◽

Ion Collisions ◽

Local Polarization ◽

Vortex Tubes

The interplay between classical vorticity being the main undisputed source of polarization in heavy-ion collisions (HIC) and quantized vortices is considered. The vortex tubes emerging in the rotating pionic (super) fluid polarize the baryons in their cores and explain the emerging global polarization. The appearance of vortices in the region separating participants and spectators in non-central HIC is similar to that for sliding layers of liquid helium. From the other side, it is also the region where the classical vorticity was earlier found to be large forming the vortex sheets. The formation of tubes manifests a threshold at certain critical vorticity implying the vanishing polarization at lower energies. For central HIC the compact jet-like flows may lead to formation of vortex rings related to local polarization. The P-odd momentum correlations for their experimental investigation are suggested. The role of shear and viscosity in the emergence of polarization is discussed.

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