scholarly journals Density and Diffusion Anomalies in a Repulsive Lattice Gas

2014 ◽  
Vol 53 ◽  
pp. 7-15 ◽  
Author(s):  
Andressa A. Bertolazzo ◽  
Marcia C. Barbosa
Keyword(s):  
Lattice Gas ◽  
And Diffusion

Thermodynamics and diffusion of a lattice gas on a simple cubic lattice

2001 ◽  
Vol 64 (6) ◽  
Author(s):  
Panos Argyrakis ◽  
Yaroslav G. Groda ◽  
George S. Bokun ◽  
Vyacheslav S. Vikhrenko
Keyword(s):  
Lattice Gas ◽  
Cubic Lattice ◽  
Simple Cubic ◽  
Simple Cubic Lattice ◽  
And Diffusion

scholarly journals Formation of Irregular Al Islands by Room-Temperature Deposition on NiAl(110)

2011 ◽  
Vol 1318 ◽  
Author(s):  
Dapeng Jing ◽  
Yong Han ◽  
Bariş Ünal ◽  
J. W. Evans ◽  
P. A. Thiel
Keyword(s):  
Room Temperature ◽  
Lattice Gas ◽  
Island Growth ◽  
Site Lattice ◽  
Adsorption Sites ◽  
Temperature Deposition ◽  
Diffusion Paths ◽  
Kinetics Of ◽  
And Diffusion ◽  
Multiple Adsorption

ABSTRACTSTM studies reveal that irregular non-equilibrium two-dimensional Al islands form during deposition of Al on NiAl(110) at 300 K. These structures reflect the multiple adsorption sites and diffusion paths available for Al adatoms on the binary alloy surface, as well as the details of inhibited edge diffusion and detachment-attachment kinetics of Al adatoms for numerous distinct step edge configurations. We attempt to capture these features by multi-site lattice-gas modeling incorporating DFT energetics for adatoms both at adsorption sites and transition states. This formulation enables description and elucidation of the observed island growth shapes.

scholarly journals Modeling and Simulation of Non-Uniform Electrolytic Machining Based on Cellular Automata

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1694
Author(s):  
Hongyu Wei ◽  
Zhongning Guo ◽  
Zhiyu Ma
Keyword(s):  
Lattice Gas ◽  
Electrochemical Machining ◽  
Corrosion Products ◽  
Cylindrical Shape ◽  
Cellular Space ◽  
Rapid Dissolution ◽  
Porous Microstructure ◽  
Mesoscopic Level ◽  
Experimental Findings ◽  
And Diffusion

Porous microstructure is a common surface morphology that is widely used in antifouling, drag reduction, adsorption, and other applications. In this paper, the lattice gas automata (LGA) method was used to simulate the non-uniform electrochemical machining of porous structure at the mesoscopic level. In a cellular space, the metal and the electrolyte were separated into orderly grids, the migration of corrosive particles was determined by an electric field, and the influences of the concentration gradient and corrosion products were considered. It was found that different pore morphologies were formed due to the competition between dissolution and diffusion. When the voltage was low, diffusion was sufficient, and no deposit was formed at the bottom of the pore. The pore grew faster along the depth and attained a cylindrical shape with a large depth-to-diameter ratio. As the voltage increased, the dissolution rates in all directions were the same; therefore, the pore became approximately spherical. When the voltage continued to increase, corrosion products were not discharged in time due to the rapid dissolution rate. Consequently, a sedimentary layer was formed at the bottom of the pore and hindered further dissolution. In turn, a disc-shaped pore with secondary pores was formed. The obtained simulation results were verified by experimental findings. This study revealed the causes of different morphologies of pores, which has certain guiding significance for non-uniform electrochemical machining.

Meridional Circulation, Turbulence, and Diffusion Processes in Stars

1976 ◽  
Vol 32 ◽  
pp. 109-116 ◽  
Author(s):  
S. Vauclair
Keyword(s):  
Convection Zone ◽  
Diffusion Processes ◽  
Meridional Circulation ◽  
Diffusion Time ◽  
Work In Progress ◽  
First Results ◽  
Stellar Envelopes ◽  
And Diffusion ◽  
Turbulence And Diffusion ◽  
Hr Diagram

This paper gives the first results of a work in progress, in collaboration with G. Michaud and G. Vauclair. It is a first attempt to compute the effects of meridional circulation and turbulence on diffusion processes in stellar envelopes. Computations have been made for a 2 Mʘstar, which lies in the Am - δ Scuti region of the HR diagram.Let us recall that in Am stars diffusion cannot occur between the two outer convection zones, contrary to what was assumed by Watson (1970, 1971) and Smith (1971), since they are linked by overshooting (Latour, 1972; Toomre et al., 1975). But diffusion may occur at the bottom of the second convection zone. According to Vauclair et al. (1974), the second convection zone, due to He II ionization, disappears after a time equal to the helium diffusion time, and then diffusion may happen at the bottom of the first convection zone, so that the arguments by Watson and Smith are preserved.

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