Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"corona discharge"”.
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Computer modeling of corona discharge phenomena.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1973. Elec.E.
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Experimental investigations of corona-discharge oxidation of silicon
… Previous research on negative point (anodic) corona-processed SiO 2 films has shown that the thermal budget incurred using the corona process is much lower than in standard thermal oxidation due to the greatly enhanced oxidation rate. Promising results of low-T corona-processed [Special …
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Surface analysis of sodium oleate coated poly (ethylene terephthalate) films
… ion mass spectrometry (SIMS). The effect of corona discharge pre-treatment on sodium oleate coating adhesion was of particular interest. The PET films were analyzed at five separate stages of production; between forward drawing of the PET and corona discharge pre-treatment, both prior to and …
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Plasma-water interface reactions caused by positive corona and glow discharges
… and positive plasma produced by two types of gas discharges: corona discharge producing low energy drift positive ions and glow discharge producing energetic positive ions. A nine-needle electrode was developed to initiate d.c. corona discharge in nitrogen and oxygen. The experiments with a mesh …
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Physical and chemical characterization of single atmospheric aerosols: Laboratory studies of interactions of acidic trace gases with sea -salt aerosols, and, Development efforts for an aerosol charging system using a corona discharge
… and trapping atmospheric aerosols using a corona discharge. Testing of this charging device indicated that only aerosols larger than twenty microns in diameter could be successfully charged and trapped.</p><p>Once assembled, calibrated and tested, the Flytrap instrument was used to study …
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A hybridized discontinuous Galerkin formulation for modeling electrohydrodynamic thrusters
… electrode in an asymmetric capacitor by a corona discharge. This thesis presents a Hybridized Discontinuous Galerkin (HDG) formulation for solving the EHD thruster governing equations with the exception of fluid flow equations. The problem is two-way coupled and non-linear. A smoothed …
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High-performance compact gas filled spark switches
… Investigating the utilisation of pre-breakdown corona discharge to increase the performance of spark switches operating in environmentally friendly gases is a re-occurring novelty throughout this study. To achieve the aim of this thesis, a number of separate approaches were adopted. In Chapter 2 …
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Investigation and Simulation of Ion Flow Control over a Flat Plate and Compressor Cascade
… to determine the effect of a positive, DC corona discharge on the boundary layer profile along a flat plate and to examine its ability to prevent separated flow in a low-speed compressor cascade. Flat plate tests were performed for two electrode configurations at free-stream velocity …
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On the use of switched-capacitor multi-level inverters for electro-aerodynamic thrust applications
… and tested for use on the dielectric barrier discharge(DBD) section of a decoupled thruster on an electro-aerodynamic(EAD) thrust plane application. The converter was a switched-capacitor multi-level inverter(SCMLI) capable of generating a variety of AC waveform shapes. The power draw of the …
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Miniaturization of Electrical Ultrafine Particle Sizers
… EUPS, which was assembled with a miniature corona–discharge unipolar charger, a miniature disk–type precipitator, and a portable condensation particle counter. All three components were calibrated under the optimized operation conditions. By combining the component calibration results, a …
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Numerical and Experimental Study of the Trichel Pulses in Needle-plane Geometry
One of the unique aspects of the negative corona discharges in the air is the regular train of pulses that form the discharge current, called Trichel pulses. These pulses are the result of the combination of several phenomena such as the avalanche ionization of the neutral molecules by the impact …
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ENHANCEMENT OF CONVECTIVE HEAT TRANSFER IN INTERNAL FLOWS USING AN ELECTRICALLY-INDUCED CORONA JET
… enhancement. Secondary flows may be generated by corona discharge and ion-driven flows. When a high electric potential is applied to a conductor, a high electric field will be generated. The high electric field may exceed the partial break-down of the neutral molecules of surrounding gas (air) and …
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Design and Testing of a Hovercraft with Electroaerodynamic Propulsion
… explored the feasibility of a wire-to-airfoil corona discharge MSD thruster powered hovercraft through a scaled-down prototype and final design. The hovercraft was tethered to a ground-based power supply and carried a payload mass to simulate having on-board power electronics to limit the scope …
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Paper spray mass spectrometry (PS-MS) for toxicological drug screens and biomonitoring of chemical warfare agent exposure
… ion sources because of its vulnerability to corona discharge, but methods are presented here to both quantify and suppress this electrical phenomenon, thus preventing it from interfering with qualitative/quantitative analyses. The validity of the discharge-suppressing method is demonstrated …
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Compact, Self-Cleaning Wet Electrostatic Precipitators
… To capture particles, we use a process called corona discharge, which gives particles an electric charge and pulls them toward the wires. A small stream of water flows down the wires, washing the particles into a container below—making the system self-cleaning. We tested how different design …
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Current measurements in electrospinning
… product. However, current sources such as the corona discharge and secondary jets will lead to a systematic overestimation of the actual current value. In this research, experiments with different configurations are set up to investigate the influence of various parameters on the measured …
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Exploration of metal 3-D printing technologies for the microfabrication of freeform, finely featured, mesoscaled structures
… in air of binder inkjet-printed SS 316L MEMS corona discharge ionizers with high aspect-ratio tips are presented. In addition, high-resolution microscopy of binder inkjet-printed SS 316L electrodes part of a novel, compact, multi-electrode harmonized Kingdon mass trap estimates at -15 ptm the …
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Additively Manufacturing High-Performance, Low-Cost Electrospray Ion Sources for Point-of-Care Mass Spectrometry
… use novel extractor electrode designs, reducing corona discharge and air breakdown, enabling operation at ~24% larger bias voltages compared to conventional cylindrical inlets. MS data is presented for ZnONW-coated emitters, detecting therapeutically relevant targets at 1 µg/ml concentrations …
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Enhanced Ambient Heat Rejection in Passive Thermal Management Systems
… electric potential close to the electrode, a Corona discharge occurs and air molecules are ionized. The resulting ions induce an air flow through collisions with neutral molecules. In this study, the Corona current is characterized experimentally and a numerical procedure is developed to solve …
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