scholarly journals Application of Novel Innovations: Iron and Manganese Nanoparticles Produced Using a Spark Discharge System

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kaushal Prasad
Keyword(s):  
Spark Discharge ◽  
Discharge System ◽  
Iron And Manganese ◽  
Manganese Nanoparticles

scholarly journals Physicochemical Characterization of Simulated Welding Fumes from a Spark Discharge System

2014 ◽  
Vol 48 (7) ◽  
pp. 768-776 ◽  
Author(s):  
Jae Hong Park ◽  
Imali A. Mudunkotuwa ◽  
Jong Sung Kim ◽  
Aditya Stanam ◽  
Peter S. Thorne ◽  
...  
Keyword(s):  
Physicochemical Characterization ◽  
Spark Discharge ◽  
Welding Fumes ◽  
Discharge System

Characterization and Control of Lean Blowout Using Periodically Generated Flame Balls

2006 ◽  
Author(s):  
Peter Albrecht ◽  
Frank Bauermeister ◽  
Mirko Bothien ◽  
Arnaud Lacarelle ◽  
Jonas Moeck ◽  
...  
Keyword(s):  
Flow Rate ◽  
Gas Turbines ◽  
Fuel Injection ◽  
Air Flow ◽  
Spark Discharge ◽  
Discharge System ◽  
Thermoacoustic Instabilities ◽  
Lean Blowout ◽  
Pilot Fuel ◽  
Industrial Gas Turbines

Combustion near LBO involves the complex physical processes including turbulence, air/fuel mixing, and chemical kinetics. The goal of this paper was to identify the typical combustion behaviour near LBO of the burner and to develop an effective actuator that will have the necessary control authority without having adverse effects such as increased emissions. Early detection and effective extension of lean blowout (LBO) are the keys to ensure flight safety and low emissions for aero engines, and are of importance to industrial gas turbines for operation below regulated NOx limits. In addition, efficient actuation are crucial for effective active LBO control. An experimental investigation of LBO was carried out using a swirl-stabilized atmospheric combustor with separate pilot and premix gaseous fuel (natural gas) injection systems. Systematic tests were performed including measurements of pressure, OH chemiluminescence and emissions for different combustor lengths, fuel split ratios, preheat temperatures and air flow rates. Operation near LBO may involve excitation of undesired thermoacoustic instabilities that have to be mitigated. LBO was approached by reducing the fuel flow rate while keeping the air flow rate, the preheat temperature and the other parameters constant. Control of the LBO and thermoacoustic instabilities was achieved by generating periodic flame balls. The LBO could be extended by 13 % relative to the natural lean blowout limit at nearly 50% reduced NO emission in comparison to common pilot fuel modulation. A spark discharge system was installed at the pilot fuel injection location. The periodic spark discharge was synchronized with the pulsed fuel injection at a phase shift of 165° and an operating frequency of 22 Hz to produce flame balls that affected the main combustion region. The flame balls excitation provided an effective tool for controlling the premix combustion characteristics at the LBO.

scholarly journals Multi-spark discharge system for preparation of nutritious water

2018 ◽  
Author(s):  
Tetsushi Nakaso ◽  
Toru Harigai ◽  
Sholihatta Aziz Kusumawan ◽  
Tomoya Shimomura ◽  
Tsuyoshi Tanimoto ◽  
...  
Keyword(s):  
Spark Discharge ◽  
Discharge System

A Miniature, Low Energy Spark Discharge System for Emission Spectrochemical Analysis of Solutions

1975 ◽  
Vol 29 (3) ◽  
pp. 244-255 ◽  
Author(s):  
J. Zynger ◽  
S. R. Crouch
Keyword(s):  
Emission Spectroscopy ◽  
Detection System ◽  
Spectral Characteristics ◽  
Spark Discharge ◽  
Mechanistic Studies ◽  
Time Resolved ◽  
Discharge System ◽  
Enhanced Sensitivity ◽  
Synchronous Integrator ◽  
Photoelectric Time

A miniature spark discharge system is described for solution analysis by emission spectroscopy. Samples are introduced as dry particles formed by nebulization into a heated desolvation chamber. The spark is formed by the discharge of a coaxial capacitor through a stream of argon which transports the desolvated aerosol. A photoelectric, time-resolved detection system for mechanistic studies and analytical applications is described. The detection system consists of a synchronous integrator controlled by a digital timing and sequencing system. The time-resolved spectral characteristics of the source are discussed, and time resolution is shown to provide enhanced sensitivity. Analytical results are reported for a variety of elements.

Synthesis of Titania Nanoparticles via Spark Discharge Method Using Air as a Carrier

2007 ◽  
Vol 544-545 ◽  
pp. 143-146 ◽  
Author(s):  
Hyun Cheol Oh ◽  
Jun Ho Ji ◽  
Jae Hee Jung ◽  
Sang Soo Kim
Keyword(s):  
Primary Particle ◽  
Spark Discharge ◽  
Titania Nanoparticles ◽  
Particle Sizes ◽  
Discharge System ◽  
Carrier Gas ◽  
Air Atmosphere ◽  
Aerosol Generator ◽  
Discharge Method ◽  
Pulsed Spark Discharge

A pulsed spark-discharge aerosol generator using air as a carrier gas was successfully applied to the titania nanoparticle production. The titanium vapor evaporated by spark discharge was subsequently supersaturated and condensed to titania nanoparticles by nucleation and condensation. The size and concentration of the particles can be controlled easily using air as a carrier gas by altering the repetition frequency, capacitance, gap distance, and flow rate of the spark-discharge system. TEM observation shows that the generated particles were aggregates, which primary particle sizes are a few nanometers. The element composition of the nanoparticles was titanium and the crystal phase was amorphous. XPS analysis shows that oxidation state of generated particles corresponded to TiO2. These XPS data indicates that some fraction of the evaporated titanium vapor could be oxidized in an air atmosphere by the oxidation with oxygen. However, enough time for crystallization was lacked because of raid cooling.

scholarly journals Force at Spark Discharge in Pin-to-Plate Gas Discharge System

2004 ◽  
Vol 70 (692) ◽  
pp. 1149-1154
Author(s):  
Shinjiro UMEZU ◽  
Hiroshi SOGABE ◽  
Hiroyuki KAWAMOTO
Keyword(s):  
Gas Discharge ◽  
Spark Discharge ◽  
Discharge System

Colloidal systems in soils

1994 ◽  
Vol 52 ◽  
pp. 64-65
Author(s):  
J. Thieme ◽  
J. Niemeyer ◽  
P. Guttman
Keyword(s):  
Clay Minerals ◽  
Polymeric Materials ◽  
Spatial Arrangement ◽  
High Specific Surface Area ◽  
Turnover Rates ◽  
Colloidal Systems ◽  
Chemical Conditions ◽  
Aggregation Phenomena ◽  
Iron And Manganese ◽  
Soil Colloids

In soil science the fraction of colloids in soils is understood as particles with diameters smaller than 2μm. Clay minerals, aquoxides of iron and manganese, humic substances, and other polymeric materials are found in this fraction. The spatial arrangement (microstructure) is controlled by the substantial structure of the colloids, by the chemical composition of the soil solution, and by thesoil biota. This microstructure determines among other things the diffusive mass flow within the soils and as a result the availability of substances for chemical and microbiological reactions. The turnover of nutrients, the adsorption of toxicants and the weathering of soil clay minerals are examples of these surface mediated reactions. Due to their high specific surface area, the soil colloids are the most reactive species in this respect. Under the chemical conditions in soils, these minerals are associated in larger aggregates. The accessibility of reactive sites for these reactions on the surface of the colloids is reduced by this aggregation. To determine the turnover rates of chemicals within these aggregates it is highly desirable to visualize directly these aggregation phenomena.

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