Can a Weak Shock Induced Local Plasma Emission and Ionization Enhancement be Caused Directly by Heavy Particle Collision?

2008 ◽  
Author(s):  
Biswa Ganguly ◽  
Peter Bletzinger
Keyword(s):  
Heavy Particle ◽  
Weak Shock ◽  
Particle Collision ◽  
Plasma Emission

scholarly journals Hydrodynamic Modeling of Turbulence Modulation by Particles in Swirling Gas-Particle Two-Phase Flow

2021 ◽  
Author(s):  
Yang Liu ◽  
Lixing Zhou
Keyword(s):  
Shear Stress ◽  
Two Phase Flow ◽  
Heavy Particle ◽  
Light Particle ◽  
Particle Collision ◽  
Order Moment ◽  
Enhancement Effect ◽  
Phase Flow ◽  
Primary Role ◽  
Two Phase

Abstract Turbulence modulations by particles of swirling gas-particle two-phase flow the axisymmetric chamber is investigated. To fully consider the preferential concentrations and anisotropic dispersions of particle, a second-order moment model coupling particle-particle collision model was improved based on the Eulerian-Eulerian two-fluid approach and the kinetic theory of granular flow. Proposed model, algorithm and in-house codes are validated and they are in good agreement with the experiment. Effects of ultralight expanded graphite and heavy Copper particles with large spans of Stokes number on gas velocity and fluctuations, Reynolds shear stress and tensor invariants, turbulence kinetic energy, and vortices structures are numerically simulated. Results show turbulent modulation exhibits strongly anisotropic characteristics and keeps in close relationship with flow structure. The disturbances of modulations, the alternations of vortex evolution are enforced by heavy-large particle with higher Stokes numbers. Preferential accumulations of light particle at shear stress regions in low vortices are weaker than those of heavy particle. For axial turbulence modulations, heavy particle plays the primary role on inhibition action due to larger inertia and light particle contributes to enhancement effect due to excellent followability.

Influence of Heavy Particle Collision on Optical Emission in Cathode Fall of DC Argon/Silane Glow Discharge

1994 ◽  
Vol 33 (Part 1, No. 7B) ◽  
pp. 4357-4360 ◽  
Author(s):  
Yoshinobu Matsuda ◽  
Kazumi Ano ◽  
Hiroharu Kawasaki ◽  
Hiroshi Fujiyama
Keyword(s):  
Glow Discharge ◽  
Heavy Particle ◽  
Optical Emission ◽  
Particle Collision ◽  
Cathode Fall

scholarly journals Improvement of the NIFS Atom and Molecular Database

Atoms ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 91 ◽  
Author(s):  
Masahiko Emoto ◽  
Izumi Murakami ◽  
Daiji Kato ◽  
Masanobu Yoshida ◽  
Masatoshi Kato ◽  
...  
Keyword(s):  
Open Source ◽  
Cross Sections ◽  
Heavy Particle ◽  
Molecular Data ◽  
Rate Coefficients ◽  
Particle Collision ◽  
Online Databases ◽  
Collision Processes ◽  
Sputtering Yields ◽  
Ruby On Rails

The NIFS (National Institute for Fusion Science) Atom and Molecular Database, which has been available online since 1997, is a numerical atomic and molecular database of collision processes that is important for fusion research. This database provides the following: (1) the cross-sections and rate coefficients for ionization, excitation, and recombination caused by electron impact; (2) the charge transfer caused by heavy particle collision and collision processes of molecules; and (3) the sputtering yields of solids and backscattering coefficients from solids. It also offers a bibliographic database. We recently reconstructed the database system. The main purpose of the reconstruction was to migrate the database into an open-source architecture to make the system more flexible and extensible. The previous system used proprietary software and was difficult to customize. The new system consists of open-source software, including PostgreSQL database and Ruby on Rails. New features were also added to the system. The most important improvement is the interface with the Virtual Atomic and Molecular Data Center (VAMDC) portal. Using this interface, researchers can search for data in the NIFS database as well as in various other online databases simultaneously.

scholarly journals Indication of strong interatomic Coulombic decay in slow He2+-Ne2 collisions

2021 ◽  
Author(s):  
Tom Kirchner
Keyword(s):  
Impact Parameter ◽  
Electron Emission ◽  
Heavy Particle ◽  
Low Energy ◽  
Energy Electron ◽  
Experimental Result ◽  
Particle Collision ◽  
Equilibrium Bond Length ◽  
Model Calculations ◽  
Low Energy Electron

Abstract Electron removal in collisions of alpha particles with neon dimers is studied using an independent-atom-independent-electron model based on the semiclassical approximation of heavy-particle collision physics. The dimer is assumed to be frozen at its equilibrium bond length and collision events for the two ion-atom subsystems are combined in an impact parameter by impact parameter fashion for three mutually perpendicular orientations. Both frozen atomic target and dynamic response model calculations are carried out using the coupled-channel two-center basis generator method. We pay particular attention to inner-valence Ne(2s) electron removal, which is associated with interatomic Coulombic decay (ICD), resulting in low-energy electron emission and dimer fragmentation. Our calculations confirm a previous experimental result at 150 keV/amu impact energy regarding the relative strength of ICD compared to direct electron emission. They further indicate that ICD is the dominant Ne+ + Ne+ fragmentation process below 10 keV/amu, suggesting that a strong low-energy electron yield will be observed in the ion-dimer system in a regime in which the creation of continuum electrons is a rare event in the ion-atom problem.

Electron-Heavy Particle Collision Model in a Plasma

1961 ◽  
Vol 4 (8) ◽  
pp. 1057 ◽  
Author(s):  
Toyoki Koga ◽  
John G. Everton ◽  
Paul C. Wilber
Keyword(s):  
Heavy Particle ◽  
Particle Collision ◽  
Collision Model
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