scholarly journals Vibrational and Chemical Kinetics in Non-Equilibrium Gas Flows

10.5772/37260 ◽  
2012 ◽  
Author(s):  
E. V. ◽  
E. A.
Keyword(s):  
Chemical Kinetics ◽  
Gas Flows ◽  
Non Equilibrium

Non-Equilibrium Reacting Gas Flows

2009 ◽  
Author(s):  
Ekaterina Nagnibeda ◽  
Elena Kustova
Keyword(s):  
Gas Flows ◽  
Non Equilibrium

scholarly journals Atmospheric-pressure Non-equilibrium Microplasmas using Liquids and Miniature Gas Flows

2010 ◽  
Vol 130 (10) ◽  
pp. 899-906 ◽  
Author(s):  
Shozo Ishii ◽  
Naoki Shirai ◽  
Shinji Ibuka ◽  
Makoto Kanemaru ◽  
Jun Kikuchi
Keyword(s):  
Atmospheric Pressure ◽  
Gas Flows ◽  
Non Equilibrium

Mass Flow Rate Measurements Through Metallic Microtubes in the Slip and Transition Regimes

2015 ◽  
Author(s):  
Ernane Silva ◽  
Cesar J. Deschamps ◽  
Marcos Rojas-Cárdenas
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Rarefied Gas ◽  
Mean Free Path ◽  
Accommodation Coefficient ◽  
Transitional Flow ◽  
Gas Flows ◽  
Slip Regime ◽  
Non Equilibrium

The exchange of momentum and energy in gas flows through microchannels is significantly influenced by the gas-surface interaction. At this scale often the gas is rarefied and therefore non-equilibrium effects in the fluid flow can arise in a layer which extends for a distance equivalent to the mean free path from the walls. Typical examples of non-equilibrium phenomena for rarefied gas flows are slip at the wall, thermal transpiration and temperature jump at the wall. The aim of the present study is to experimentally investigate the non-equilibrium effects present in an isothermal pressure induced flow for a large range of rarefaction conditions. The isothermal slip at the wall is usually characterized by the tangential momentum accommodation coefficient (TMAC). This coefficient depends on the molecular nature of the gas and on the physical characteristics of the surface, such as material and roughness. In particular this paper explores the influence of the surface material on the TMAC through measurements of the mass flow rate in capillaries for the special case of nitrogen. Commercially available microtubes of three different metallic materials — stainless steel, copper, and brass — were considered in the analysis. Measurements were performed with a dynamic measurement technique based on the constant volume method and comprehend the transitional flow regime and most part of the slip regime. Theoretical results obtained from the solution of the Boltzmann equation via the BGK kinetic model, which is a simplified approximation for the collisional term, were compared to the experimental results.

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