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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 42 for “"dielectric barrier"”.
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Optimisation of ozone generation using dielectric barrier discharge
… fundamental kinetics of ozone generation using dielectric barrier discharge and investigating the potential to optimize the process to improve ozone generation efficiency.The kinetics of ozone generation and its limitations are reviewed. The discharge characteristics of single filaments are …
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Pulsed nanosecond dielectric barrier discharge in nitrogen at atmospheric pressure
Small power devices are of strong interest as many electronics are made more compact. Those portable power sources are widely used in aerospace applications such as small UAVs and satellite thrusters. Typically, these portable devices rely on batteries, but small power generators based on …
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CO2 Dissociation using the Versatile Atmospheric Dielectric Barrier Discharge Experiment (VADER)
… can then be recycled or stored chemically.;A Dielectric Barrier discharge (DBD) is a pulsed, low temperature, non-thermal, atmospheric pressure plasma which creates high energy electrons suitable for dissociating CO2 into its components (CO and O) as one step in the CCU process. Here I discuss …
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Atmospheric pressure plasma chemical deposition by using dielectric barrier discharge system
… type and newly designed cylindrical DBD (Dielectric Barrier Discharge) torch have been characterized and compared based on the electrical and optical diagnostics results. The impact of electric field on APCVD (Atmospheric pressure plasma chemical vapor deposition) process was investigated …
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Optimization of surface dielectric barrier discharge ion sources for electroaerodynamic propulsion
Surface dielectric barrier discharges (SDBDs) are a type of asymmetric dielectric barrier discharge (DBD) that can be used to generate ions and produce aerodynamic forces in air. They have been studied for aerodynamic flow control and proposed for small aircraft propulsion as both direct sources of …
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Modeling of a dielectric barrier discharge (DBD) plasma reactor for soil remediation
… a promising plasma technology that uses a Dielectric Barrier Discharge (DBD) reactor to produce highly reactive oxidized species. The present work models plasma inside the DBD reactor and evaluates the production of oxidized species used for pollutant degradation and, eventually, for soil …
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Multi-Physics Model of a Dielectric Barrier Discharge Flow Control Actuator with Experimental Support
… supported multi-physics model of a dielectric barrier discharge boundary layer flow control actuator. The model is independent of empirical data about the specific behavior of the system. This model contributes to the understanding of the specific mechanisms that enable the actuator …
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Flow Control on an Airfoil Under Reversed Flow Conditions Using Nanosecond Dielectric Barrier Discharge Actuators
… into active flow control using Nanosecond Dielectric Barrier Discharge (NS-DBD) plasma actuation to manipulate the behavior of reversed flow over an airfoil. Similar in geometry to the more widely-studied AC-DBD actuators, NS-DBD actuators implement a high-voltage signal consisting of a …
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Development of large scale tight-binding methods, and application to electron transfer in symmetric dielectric barrier discharges (DBDS)
… mechanism for electron transfer in symmetric dielectric barrier discharge plasma generators (DBDs). DBDs are useful in a wide variety of applications where the plasma generated is used for materials processing, combustion, and flow control. Our interest is in determining the rate of electron …
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Improvements on dielectric barrier discharge applications: Plasma photonic crystal tuning by individually controlled filaments and surface DBD water treatment
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Kinetic processes and plasma remediation of toxic gases
… work we computationally study the application of Dielectric Barrier Discharges to the remediation of perchloroethylene (C$\sb2$Cl$\sb4$ or PCE) and N$\rm\sb{x}$O$\rm\sb{y}$. We determine the kinetic processes that occur in remediation in order to devise methods for improving the energy efficiency …
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On the use of switched-capacitor multi-level inverters for electro-aerodynamic thrust applications
… converter was designed 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 …
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Hydration-Induced Plasma Surface Modification of Aluminum Nanoparticles for Power Generation in Oxygen Deficient Environments
… Combining water-vapor with an atmospheric helium dielectric barrier discharge (DBD) plasma yields a thinner Al2O3 shell with double the surface hydration compared to as-received aluminum nanoparticles (nAl). Non-equilibrium combustion studies on plasma-treated nAl particles demonstrate increased …
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Design of Optical Measurements for Plasma Actuators for the Validation of Quiescent and Flow Control Simulations
… is through the use of multi-physics modeling of dielectric barrier discharge actuators. The research in this thesis uses optical measurement techniques to validate computational models of flow control actuators being done concurrently at Virginia Tech. The primary focus of this work is to design, …
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Al/Al2O3 microchannel plasma chemical reactor for ozone synthesis
… O3 reactors, relative to conventional dielectric barrier discharge technology, appear to be feasible.
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Microplasma antennas: characterizing capillary plasma discharges as potential monopole antennas
… antenna elements. Glass tubes operated as a dielectric barrier discharge, or DBD, driven by an AC voltage of 10--40 kHz showed peak electron densities of n_e = 10^(15) cm^(-3). Time-averaged electron densities and conductivities in these tubes remained well below n_e = 10^(14) cm^(-3) and σ_p …
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High-Frequency Electronics for Contactless Dielectrophoresis
… physically separated from the sample by a thin dielectric barrier. This work presents two methods for providing the high-voltage and high-frequency signal necessary to generate a non-uniform electric field in the sample channel of a cDEP device. The first method, an oscillator-based system, was …
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Particle modeling of non-equilibrium field emission driven RF microplasmas
… study on the concept of flow actuation by dielectric barrier discharge using field emission (FE-DBD) is performed. Theoretical analysis and simulations for microplasma actuated planar Poiseuille flow show that the gain in flow rate is inversely proportional to the Reynolds number. The …
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Coupled phenomena in arrays of microplasma devices and microchannel plasma devices as antennas
… distribution of charge deposited on a dielectric layer in a dielectric barrier device structure appears to be responsible for the oscillations and coupling. It was also observed, in arrays of microcavity plasma devices with a gap, that free microdischarges interact with bounded …
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Studies on the Conversion of Atmospheric Carbon Dioxide to Methanol
… for plasma-driven splitting of CO₂ through dielectric barrier discharge. In supporting dielectric barrier discharge for non-thermal plasma, Cu-CeOₓ appeared to form oxygen vacancies able to scavenge oxygen after cleavage of the CO₂ molecule, whereas the Cu-ZnO and Cu-ZrOₓ catalysed the …
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