Dimensional Analysis to Ozone Generation by Pulsed Streamer Discharge in Dry Air

2011 ◽  
Vol 204-210 ◽  
pp. 828-833 ◽  
Author(s):  
Lin Sheng Wei ◽  
Zhao Ji Hu ◽  
Ya Fang Zhang
Keyword(s):  
Nitrogen Oxides ◽  
Dimensional Analysis ◽  
Gas Flow ◽  
Influencing Factor ◽  
High Energy ◽  
Streamer Discharge ◽  
Dry Air ◽  
Ozone Generation ◽  
Pulsed Streamer Discharge ◽  
Experimental Findings

The generation of ozone is efficient by using short high-voltage combined with a dielectric layer placed adjacent to the outer electrode in dry air. Ozone concontration depend on the peak pulsed voltage, pulse repetition rate, gas flow rate, reactor length and so on. For ozone generation by pulsed streamer discharge in dry air, a mathematical model, which describes the relation between ozone concentration and these parameters that are of importance in its design, is developed according to dimensional analysis theory. The presence of nitrogen on ozone formation in dry air cannot only consume high energy electron but also form nitrogen oxides (NOx) in discharge plasma. Nitrogen oxides (NOx) play an important role in the process of ozone generation in air discharge, where the catalytic cycle for ozone destruction takes place. So the nitrogen influencing factor should be considered. Formula is derived for predicting the characteristics of the ozone generation, within the corona inception voltage to the gap breakdown voltage. The predicted results are shown to be in good agreement with experimental findings.

scholarly journals Ozone Generation by Pulsed Streamer Discharge in Air

2009 ◽  
Vol 1 (2) ◽  
Author(s):  
Zolkafle Buntat ◽  
Ivor R. Smith ◽  
Noor. A. M. Razali
Keyword(s):  
Streamer Discharge ◽  
Ozone Generation ◽  
Pulsed Streamer Discharge

Pulsed streamer discharge characteristics of ozone production in dry air

2000 ◽  
Vol 7 (2) ◽  
pp. 254-260 ◽  
Author(s):  
W.J.M. Samaranayake ◽  
Y. Miyahara ◽  
T. Namihira ◽  
S. Katsuki ◽  
T. Sakugawa ◽  
...  
Keyword(s):  
Ozone Production ◽  
Streamer Discharge ◽  
Discharge Characteristics ◽  
Dry Air ◽  
Pulsed Streamer Discharge

A method of water-bloom prevention using underwater pulsed streamer discharge

2008 ◽  
Vol 43 (10) ◽  
pp. 1209-1214 ◽  
Author(s):  
Zi Li ◽  
Takeshi Ohno ◽  
Hiroshi Sato ◽  
Takashi Sakugawa ◽  
Hidenori Akiyama ◽  
...  
Keyword(s):  
Water Bloom ◽  
Streamer Discharge ◽  
Pulsed Streamer Discharge

Surface Plasma Molybdenized Burn-Resistant Titanium Alloy

2007 ◽  
Vol 353-358 ◽  
pp. 1837-1841 ◽  
Author(s):  
Ping Ze Zhang ◽  
Zhong Xu ◽  
Gao Hui Zhang ◽  
Zhi Yong He ◽  
Hong Yan Wu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Ignition Temperature ◽  
Gas Flow ◽  
High Energy ◽  
Alloy Layer ◽  
Alloying Element ◽  
Resistant Alloy ◽  
Energy Laser ◽  
Glow Plasma ◽  
Conventional Titanium Alloy

Conventional titanium alloy may be ignited and burnt under high temperature, high pressure and high gas flow velocity condition. In order to avoid this problem, a new kind of burn-resistant titanium alloy-double glow plasma surface alloying burn-resistant titanium alloy has been developed. Alloying element Mo is induced into the Ti-6Al-4V substrate according to double glow discharge phenomenon, Ti-Mo binary burn-resistant alloy layer is formed on the surface of Ti-6Al-4V alloy. The depth of the surface burn-resistant alloy layer can reach about 100 microns and alloying element concentration can reach 59%. High energy laser ignition experiments reveal that the ignition temperature of alloyed layer with Mo concentration about 10% is about 200°C higher than ignition temperature of Ti-6Al-4V.

The Mechanics and Thermodynamics of Steady One-Dimensional Gas Flow

1947 ◽  
Vol 14 (4) ◽  
pp. A317-A336 ◽  
Author(s):  
Ascher H. Shapiro ◽  
W. R. Hawthorne
Keyword(s):  
Heat Transfer ◽  
Dimensional Analysis ◽  
High Speed ◽  
Gas Flow ◽  
Gas Injection ◽  
Wall Friction ◽  
Analytical Treatment ◽  
Area Change ◽  
One Dimensional ◽  
Recent Developments

Abstract Recent developments in the fields of propulsion, flow machinery, and high-speed flight have emphasized the need for an improved understanding of the characteristics of compressible flow. A one-dimensional analysis for flow without shocks is presented which takes into account the simultaneous effects of area change, wall friction, drag of internal bodies, external heat exchange, chemical reaction, change of phase, injection of gases, and changes in molecular weight and specific heat. The method of selecting independent and dependent variables, and the organization of the working equations, leads, it is believed, to a better understanding of the influence of the foregoing effects, and also simplifies greatly the analytical treatment of particular problems. Examples are given first of several simple types of flow, including (a) area change only; (b) heat transfer only; (c) wall friction only; and (d) gas injection only. In addition, examples of flow with combined effects are given, including (a) simultaneous friction and area change; (b) simultaneous friction and heat transfer; and (c) simultaneous liquid injection and evaporation. A one-dimensional analysis for flow through a discontinuity is presented, allowing for energy, shock, drag, and gas-injection effects, and for changes in gas properties. This analysis is applicable to such processes as: (a) the adiabatic normal shock; (b) combustion; (c) moisture condensation shocks; and (d) steady explosion waves.

scholarly journals A Coupled Gas Flow-Mechanical Damage Model and Its Numerical Simulations on High Energy Gas Fracturing

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Yu Bai ◽  
Li Sun ◽  
Chenhui Wei
Keyword(s):  
Numerical Simulations ◽  
Stress Wave ◽  
Gas Flow ◽  
High Energy ◽  
Stress Wave Propagation ◽  
Crack Evolution ◽  
Element Analysis ◽  
Unconventional Gas ◽  
Radial Cracks ◽  
The Impact

High-energy gas fracturing (HEGF) and gas fracturing (GF) are considered to be efficient to enhance the permeability of unconventional gas reservoir. The existing models for HEGF mainly focus on the dynamic loading of stress wave or static loading of gas pressurization, rather than on the combined actions of them. Studies on the combination of HEGF and GF (HEGF+GF) are also few. In this paper, a damage-based stress wave propagation-static mechanical equilibrium-gas flow coupling model is established. Numerical model and determination of mesomechanical parameters in finite element analysis are described in detail. Numerical simulations on crack evolution under HEGF, GF, and HEGF+GF are carried out, and the impact of in situ stress conditions on crack evolution is discussed further. A total of 11 cracks with length of 2.3-4 m in HEGF, 4 main cracks with length of 6.5–8 m in GF, and 11 radial cracks with length of 2–11.5 m in HEGF+GF are produced. Many radial cracks around the borehole are formed in HEGF and extended further in GF. The crustal stress difference is disadvantageous for crack complexity. This study can provide a reference for the application of HEGF+GF in unconventional gas reservoirs.

Different void fluctuation in ring-like events and jet-like events in 16O–AgBr interactions at 60 AGeV

2014 ◽  
Vol 23 (11) ◽  
pp. 1450067 ◽  
Author(s):  
M. Mondal ◽  
S. Biswas Ghosh ◽  
A. Mondal ◽  
D. Ghosh ◽  
A. Deb
Keyword(s):  
Phase Transition ◽  
Production Process ◽  
Dimensional Analysis ◽  
High Energy ◽  
Two Dimensional ◽  
Hadron Phase ◽  
High Energy Collisions ◽  
Two Parameters

This paper reports a study of fluctuations and possible signature of quark–hadron phase transition in high energy collisions. The study is based on the ring-like and jet-like events for pions produced in 16 O – AgBr interactions at 60 AGeV. We have performed two-dimensional analysis (η-φ space) of fluctuation of voids for two types of azimuthal substructures of produced pions (ring-like and jet-like) following connecting void approach given by R. C. Hwa and Q. H. Zhang. The values of two parameters "c" and "s" reveal different void pattern fluctuation in ring-like and jet-like events, which hints toward different mechanism in their production process.

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