Continuum-Rarefied Modeling of Plume-Surface Interaction in Low-Pressure Environments.

2022 ◽  
Author(s):  
Manuel Gale ◽  
Robert E. Harris
Keyword(s):  
Low Pressure ◽  
Surface Interaction

scholarly journals N2–H2 capacitively coupled radio-frequency discharges at low pressure: II. Modeling results: the relevance of plasma-surface interaction

2020 ◽  
Vol 29 (8) ◽  
pp. 085023 ◽  
Author(s):  
Miguel Jiménez-Redondo ◽  
Audrey Chatain ◽  
Olivier Guaitella ◽  
Guy Cernogora ◽  
Nathalie Carrasco ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Low Pressure ◽  
Surface Interaction ◽  
Capacitively Coupled ◽  
Plasma Surface ◽  
Radio Frequency Discharges

Experimental Measurement of Energy Accommodation Coefficient by Low-Pressure Method

2009 ◽  
Author(s):  
Hiroki Yamaguchi ◽  
Yuta Aoki ◽  
Kazuaki Kanazawa ◽  
Yu Matsuda ◽  
Tomohide Niimi
Keyword(s):  
Heat Flux ◽  
Knudsen Number ◽  
Characteristic Length ◽  
Low Pressure ◽  
Accommodation Coefficient ◽  
Surface Interaction ◽  
Molecular Flow ◽  
Free Molecular Flow ◽  
Pressure Method ◽  
Energy Accommodation

Heat transfer in micro flows has received much attention along with the development in micro- and nano-technology. In micro- and nano-flow fields, the Knudsen number, which is defined as a ratio of the molecular mean free path to the characteristic length of the system, becomes large because of the small characteristic length. In these so-called “high Knudsen number flows”, the number of the collision of gas molecules to the surface is much larger than that of intermolecular collisions. Therefore, it is important for the high Knudsen number flows to understand the gas-surface interaction. Since detailed science of the gas-surface interaction is complicated, the empirical parameter called the accommodation coefficient is widely used for flow analyses of the flows. In this study, the energy accommodation coefficient for metal surface has been measured experimentally by the Low-Pressure method, in which the energy accommodation coefficient is obtained from the pressure dependency of the heat flux in the free-molecular flow regime. It is not easy to realize the free-molecular flow condition, and, thus, the relation between the heat flux and the pressure extended to much higher pressure condition was employed in this study. Experimental geometry was designed as concentric cylinders, and heat flux between two cylinders, whose surface temperatures was different, was measured. Experimental results are reported for argon and oxygen in contact with a platinum surface. The surface temperature dependence of the energy accommodation coefficient was also studied, and verified by the results of previous work.

Effects of Electrical Discharges in Low Pressure Gases on the Morphology of Polyethylene Crystals

1974 ◽  
Vol 32 ◽  
pp. 544-545
Author(s):  
L.H. Bolz ◽  
D.H. Reneker
Keyword(s):  
Power Distribution ◽  
Electrical Discharge ◽  
Dielectric Breakdown ◽  
Ionic Species ◽  
Low Pressure ◽  
Polymer Surfaces ◽  
Electrical Discharges ◽  
Adhesive Bonds ◽  
Power Distribution Lines ◽  
Modification Of The Surface

The attack, on the surface of a polymer, by the atomic, molecular and ionic species that are created in a low pressure electrical discharge in a gas is interesting because: 1) significant interior morphological features may be revealed, 2) dielectric breakdown of polymeric insulation on high voltage power distribution lines involves the attack on the polymer of such species created in a corona discharge, 3) adhesive bonds formed between polymer surfaces subjected to such SDecies are much stronger than bonds between untreated surfaces, 4) the chemical modification of the surface creates a reactive surface to which a thin layer of another polymer may be bonded by glow discharge polymerization.

Field ion microscopy

1988 ◽  
Vol 46 ◽  
pp. 434-435
Author(s):  
Gert Ehrlich
Keyword(s):  
Low Temperature ◽  
Sample Surface ◽  
Low Pressure ◽  
Radius Of Curvature ◽  
Field Ion Microscopy ◽  
Phosphor Screen ◽  
Ion Microscopy ◽  
Field Ion Microscope

The field ion microscope, devised by Erwin Muller in the 1950's, was the first instrument to depict the structure of surfaces in atomic detail. An FIM image of a (111) plane of tungsten (Fig.l) is typical of what can be done by this microscope: for this small plane, every atom, at a separation of 4.48Å from its neighbors in the plane, is revealed. The image of the plane is highly enlarged, as it is projected on a phosphor screen with a radius of curvature more than a million times that of the sample. Müller achieved the resolution necessary to reveal individual atoms by imaging with ions, accommodated to the object at a low temperature. The ions are created at the sample surface by ionization of an inert image gas (usually helium), present at a low pressure (< 1 mTorr). at fields on the order of 4V/Å.

Low pressure improves ink jets

Nature ◽  
2005 ◽  
Author(s):  
Philip Ball
Keyword(s):  
Low Pressure
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