Improvements on dielectric barrier discharge applications: Plasma photonic crystal tuning by individually controlled filaments and surface DBD water treatment

Paliwoda, Matthew Crawford

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https://hdl.handle.net/2142/117751 Copy

Description

Title

Improvements on dielectric barrier discharge applications: Plasma photonic crystal tuning by individually controlled filaments and surface DBD water treatment

Author(s)

Paliwoda, Matthew Crawford

Issue Date

2022-11-17

Director of Research (if dissertation) or Advisor (if thesis)

Rovey, Joshua L

Doctoral Committee Chair(s)

Rovey, Joshua L

Committee Member(s)

• Levin, Deborah
• Curreli, Davide
• Kim, Minkwan

Department of Study

Aerospace Engineering

Discipline

Aerospace Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

• Atmospheric Plasma
• Dielectric Barrier Discharge
• Plasma Metamaterial
• Photonic Crystal
• Plasma Microwave Interaction
• Plasma Waves
• Plasma Water Treatment
• Methylene Blue

Abstract

Dielectric barrier discharge is a form of atmospheric plasma that has found interest for applications in a growing variety of industries. Its benefits include: no vacuum facility, atmospheric air as the working gas, low temperature, low current, and significant production of free radicals. Improving upon current methods of DBD microwave control and water treatment is the focus of this dissertation. The microwave control portion of this work demonstrates a method for improving the tunability of plasma photonic crystals (PPC). PPCs are structures with periodic plasma elements that reflect electromagnetic waves at wavelengths on the order of twice the plasma periodicity and can be used to construct a wide variety of microwave components. A 2D PPC is formed by an organized array of DBD plasma filaments. Simulations of this structure identifies the background permittivity and column radius as key parameters for manipulating the bandgap width and frequency. A method for effectively changing the lattice constant, radius, and background permittivity is devised by individually controlling each periodic plasma column. This method expands the tunable frequency range by an order of magnitude. To physically implement this individually controlled PPC, the discharge electrodes are resistively biased to change the dielectric surface charge and reduces the plasma density along the filament. A DBD PPC is constructed from a 10x10 array of individually addressable electrode pins. A digital control circuit is constructed to accomplish this task with input from a microcontroller and simultaneously control multiple pins. The water treatment portion of this work demonstrates a new water treatment setup that uses a DBD to produce ozone and pass the reactive molecules into water. The degrading effect of the reactive species on contaminants is measured by the deceased concentration of Methylene Blue (MB) within the water. Different discharge parameters are examined to gauge their effect on the degradation efficiency and optimize the setup. The gas-liquid surface area per liquid volume is identified as a key parameter for improving degradation efficiency as it increases the quantity of ozone to water without increasing the required power input.

Graduation Semester

2022-12

Type of Resource

Thesis

Copyright and License Information

Copyright 2022 Matthew Paliwoda

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