A5077548933- Plasma Applications and Diagnostics
- Plasma Diagnostics and Applications
- Electrohydrodynamics and Fluid Dynamics
- Aerosol Filtration and Electrostatic Precipitation
- Laser Design and Applications
- Laser-induced spectroscopy and plasma
- Plasma and Flow Control in Aerodynamics
- Lightning and Electromagnetic Phenomena
- Dust and Plasma Wave Phenomena
- Diamond and Carbon-based Materials Research
- Solid State Laser Technologies
- Surface Modification and Superhydrophobicity
- Particle Dynamics in Fluid Flows
- Electrostatic Discharge in Electronics
- Ionosphere and magnetosphere dynamics
- Fluid Dynamics and Heat Transfer
- Metal and Thin Film Mechanics
- Fluid Dynamics and Mixing
- Atomic and Subatomic Physics Research
- Semiconductor materials and devices
- Atomic and Molecular Physics
- Gas Sensing Nanomaterials and Sensors
- Vacuum and Plasma Arcs
- Gyrotron and Vacuum Electronics Research
- Catalytic Processes in Materials Science
Joint Institute for High Temperatures
2015-2024
University of Michigan–Ann Arbor
2009-2014
Russian Academy of Sciences
1996-2014
Michigan United
2014
Iowa State University
2005-2008
Pohang University of Science and Technology
2004-2005
Abstract The 2022 Roadmap is the next update in series of Plasma Roadmaps published by Journal Physics D with intent to identify important outstanding challenges field low-temperature plasma (LTP) physics and technology. format same as previous representing visions 41 leading experts 21 countries five continents various sub-fields LTP science In recognition evolution field, several new topics have been introduced or given more prominence. These emphasis highlight increased interests...
The results of two-dimensional (2D) numerical simulation single positive streamer development in atmospheric air sphere - plane electrode configuration are presented. Correlation parameters with radius and applied voltage U is revealed. values the electric field at head channel shown to be almost independent equal 150 180 correspondingly. Streamer velocity radial dimensions linearly increase U, coefficient these linear relations being . Comparison obtained by 2D modelling frame commonly used...
Arrays of atmospheric-pressure plasma jets are being considered as a means to increase the area treated in surface modification and medicine particular. A unique challenge scaling jet arrays is that individual an array tend interact with each other, which can lead quenching some jets. To investigate these potential interactions, computational study one-, two- three-tube micro-plasma was performed. An He/O2 = 99.8/0.2 mixture flowed through tubes into humid room air. We found electrostatic,...
The application of atmospheric pressure plasmas to human tissue has been shown have therapeutic effects for wound healing and in treatment skin diseases.These are attributed both production beneficial radicals which intersect with biological reaction chains the surface intracellular generation electric fields.In this paper, we report on computational studies intersection plasma streamers dielectric barrier discharges (DBDs) sustained air tissue, emphasis fields.Intracellular structures their...
In this paper, we report on results from a computational investigation of nanosecond pulsed surface discharges positive and negative polarity using 2D fluid fluid-Monte Carlo simulation. The streamers propagate along the dielectric in an asymmetric actuator geometry. essential difference between polarities is observed. For intense sheath region formed near having high values electric field. streamer has lower field at front region. disparity increases when electron Monte simulation used that...
Pulsed discharges in high-pressure gases are of considerable interest as sources nonequilibrium plasma for various technological applications: pollution control, pumping laser media, plasma-assisted combustion, etc. Recently, attention has been attracted to the use subnanosecond voltage fronts, producing diffuse with radii several millimeters. Such structures, similar pulsed glow discharges, special applications due quasi-uniformity parameters relatively large gas volumes. This review...
Particle-in-cell/Monte Carlo simulations are used to study the possibility of ion energy distribution function (IEDF) control on powered electrode in asymmetric single and double frequency capacitive discharges argon. The IEDF is demonstrated. It shown that shape spread cathode can be controlled by driven voltage a discharge low dual discharge. capacitively coupled plasmas. density plasma decreases, sheath width, potential self-bias increase, with growth
Electric discharges and streamers in liquids typically proceed through vapour phase channels produced by the streamer or gaseous bubbles. The bubbles can originate enthalpy changes discharge be artificially injected into liquid. Experiments on immersed have shown that propagates either along surface of bubble volume as conventional propagation air. In this paper we report results a computational investigation liquids. We found dielectric constant liquid large part determines path takes....
Abstract The application of atmospheric-pressure plasmas to human tissue has been shown have therapeutic effects for wound healing and in treatment skin diseases. In this paper, we report on a computational study the intersection plasma filaments dielectric barrier discharge (DBD) with small context medicine. is represented as cut epidermal layer cells. Intracellular structures their electrical properties were incorporated into two-dimensional mesh order self-consistently couple gas phase...
The treatment of wounds by atmospheric pressure plasmas in the context plasma medicine typically proceeds through a liquid layer covering exposed cells. and their often have irregular shapes with electrical properties (i.e. conductivity permittivities) that may differ not only from wound-to-wound but also for single wound as healing proceeds. differing extend into within contains cellular materials such blood platelets. plasma, wound, intra-liquid components represent an interacting system...
The results of two-dimensional numerical simulation single positive and negative streamer development in atmospheric air weak uniform electric fields are presented. It is shown that the form channel rate growth velocity with its length determined by magnitude polarity applied field E/sub 0/. difference between parameters streamers decreases agree findings qualitative analysis dynamics.
For a single-frequency capacitively coupled radio-frequency discharge, the detailed examination has been carried out of plasma density and sheath width, average potential profiles, ion-energy distribution at electrodes electron-energy in bulk as function pressure, voltage, frequency using particle-in-cell/Monte Carlo simulation. The results for Ar gas are presented. Scaling parameters with external is determined. characteristics dual-frequency argon discharge studied different ratio high/low...
The propagation of electric discharge streamers inside bubbles in liquids is interest for the remediation toxins water and plasma-based surgical instruments. manner streamer has an important influence on production reactive species that are critical to these applications. Streamer along surface electrode-attached air water, previously predicted by numerical simulations, been experimentally imaged using a fast frame-rate camera. successive pulsing produced oscillations air–water interface....
The branching of streamers in high pressure gas discharges and liquids is an almost universal occurrence having many causes. In this paper, we discuss results investigation one possible cause—inhomogeneities the media through which streamer propagates. These inhomogeneities produce corresponding enhancements or decreases ionization excitation as avalanche front encounters them, some may branching. Three types were investigated—negative bubbles (regions a lower density than ambient), positive...
Abstract The application of atmospheric pressure plasmas to human tissue has been shown have therapeutic effects for wound healing and in treatment skin diseases. These are attributed production UV photon fluxes, electric fields beneficial radicals which intersect with biological reaction chains, energetic ions bombarding the surface. In this paper we report on results from a computational investigation ion energy angular distributions (IEADs) dielectric-barrier discharge sustained air...
In this paper, we report on results from a computational investigation of nanosecond pulsed discharges in air negative polarity using two-dimensional fluid and fluid-Monte Carlo simulations. The parameters conditions are taken an experiment. discharge is initiated near the cathode having small radius curvature propagates towards flat anode. simulations done atmospheric pressure with pulse 120 kV amplitude 12 mm gap sharp cathode. essential difference between by low- high-energy beams...
In this paper, we discuss the results from computational investigation of effect a metal grounded target, target at floating potential and dielectric targets (conductive non-conductive) on plasma bullet propagation reflection. We show that intensity primarily ionization wave (IW) is highest for while it significantly lower non-conductive dielectric. For conductive dielectric, greater than dielectrics, but target. After forward IW touches reflected waves are observed all under investigation....
Abstract In this paper, a review of general and specific properties ionization waves—streamers is presented. Characteristics streamers in gases liquids, sprites the Earth’s atmosphere guided cold atmospheric-pressure plasma jets are discussed. Information on streamer structure, propagation velocity radius, parameters (electron density channel, peak electric field head) various media, obtained using diagnostic methods, numerical modeling analytical approach, analyzed.
Atmospheric pressure plasmas, and streamers in particular, sustained air often encounter dust or aerosol particles having sizes of a few to tens micrometres. The dynamics intersecting such are interest due their possible use for functionalizing the surfaces particles. Using 2-dimensional plasma hydrodynamics model an unstructured mesh, consequences on streamer were investigated while varying particle size, shape material properties. We found that small dielectric (< micrometres) enveloped by...
In atmospheric pressure discharges, ion energies are typically thought to be thermal with values dominantly <1 eV. the heads of filaments in dielectric barrier discharges (DBDs), electric fields can exceed 200 kV cm−1 when filament is far from a surface. As approaches and intersects surface, much applied potential compressed into voltage drop across head due high conductivity trailing plasma channel. When strikes this transferred resulting sheath material The degree field compression depends...
In this paper we report on results from a computational investigation of streamer evolution in bubbles immersed liquids. We show that avalanche-to-streamer transition and formation the uniform electric field are determined by applied external field, parameter pR (pressure times bubble size), as well location amount initial free charges inside bubble. found streamers not formed with rather small size, unless pre-existed or injected large enough to initiate breakdown. The present relates size...
Self-organization of filaments in dielectric-barrier discharges (DBDs) probably has many origins. However, the dominant cause is proposed to be accumulation charge on surfaces bounding dielectrics that reinforces successive discharge pulses occur at same locations. A secondary electrostatic repulsion individual plasma filaments. typically develops over pulses. In this paper, we discuss results a computational investigation overvoltage DBDs that, under select conditions, display...
Results of simulation subnanosecond streamer propagation in corona gap configuration, obtained the framework 2D fluid model, are presented. Effects related with polarity a voltage pulse applied to stressed electrode discussed. It is argued that these effects (dependence discharge current and velocity on voltage) observed experiments can be attributed difference initial (preceding formation) distributions charged species inside gap. This caused by preionization (at negative polarity) gas...
Results of simulation positive streamer propagation in atmospheric air, obtained the framework a 2-D fluid model, at various rise times applied voltage pulses are presented. It is shown that variation time allows one to control characteristics: widths, velocity, densities charged and excited neutral species, electric current. At very short (subnanosecond) times, it possible obtain wide streamers, carrying large currents producing considerable amounts reactive species.