DOI: 10.5061/dryad.crjdfn3d9
title: Data from: Bubbling water-treating DBD plasma device optimization using experimental and computational methods

description:  A dry air atmospheric pressure volume dielectric barrier
 discharge, produced immediately below a water volume, is employed to
 produce plasma treated water. Producing treated water with high
 concentrations of reactive oxygen nitrogen species such as nitrate for use
 as nitrogen fertilizer is the primary motivation behind this design. A 0D
 chemistry model is developed and informed by the electrical, geometric and
 plasma gas temperature characteristics of the device. Modeled ozone and
 nitrate densities are compared to those measured experimentally in the
 plasma effluent and treated liquid for a range of gas temperatures.
  Good agreement is demonstrated between the ozone densities
 measured in the effluent; however, the model does not account for the
 liquid chemistry. A gas temperature based shift from ozone to NOx
 producing regimes is observed in both experiment and model, and the
 reactions responsible for this shift are discussed.
description: # Data from: Bubbling water-treating DBD plasma device optimization using
 experimental and computational methods Submitted here is the raw data
 pertaining to the aforementioned article. The data has been separated into
 folders as it relates to the sections in said article.  Below is detailed
 description of how to discern the data as it is presented in there.
 Additional READMEs may be found.  **0D Model** * Data presented here are
 the output files of the (not included) Zapdos script in .xlsx format,
 which is a 0D model of the DBD plasma chemistry. * The first three digits
 in the files names (i.e. 320) correspond to the gas temperature, in
 kelvin, of that particular simulation. * The files are sorted by column,
 with the top row denoting the contents. * time = the time step of the
 simulation and is given in seconds * All species densities are given in
 cm^-3 * These are noted in typical chemical abbreviations: * O = Oxygen *
 N = Nitrogen * e = electon * +/- = positive/negative ions * Te = electron
 temperature in eV * Tg = Gas Temperature in K * V = Voltage in V * Rate #
 =  calculated rate for reaction # in the model, given in s^-1.  List of
 reactions is not included. * Rate_constant# = Rate constant used to
 determine Rate #.  Units vary depending on number of reactants: s^-1, cm^3
 s^-1, cm^6 s^-1, cm^9 s^-1. **Bubble Dynamics** * Data included here
 corresponds to the observed trends in nitrate (NO3) concentration with the
 treated liquid with changing bubble size and flow rate. * Two types of
 data are provided: * Absorbances values from colorimetric measurements are
 provided in .txt files, how these are correlated to concentrations is
 given in the associated .xlsx files. * The .txt files are organized into
 two columns with the left one corresponding to the wavelength of light (in
 nanometers) and the right corresponding to the absorbance at that
 wavelength. * Operational parameters of the spectrometer are also provided
 in the .txt files. * All times are provided in minutes. * All
 concentrations (Conc.) are provided in mg/L * All flow rates are in sccm.
 * Absorbances (Absorb.) are converted to concentrations using a standard
 curve, the coefficients of which ('m' and 'b'
 corresponding to a linear equation) are provided in the associated .xlsx
 files * Production (Prod.)  is given in mg/min * Colorimetric samples are
 sometimes diluted in order to be within the measurable range.  What
 samples and to what degree are denoted in the .xlsx files. * The .xlsx
 files typically include a 'Parameters' list which inclues the
 following details: * Applied voltage in kV * Frequency of voltage waveform
 in Hz * Treated volume in mL * Full treatment time in min * Which power
 supply was used * The absorbance .txt files generally include the time at
 which the samples were collected in the file name. * Except for those from
 Test 8, which instead include the air flow rate in sccm. * Images of
 bubbles transporting up the liquid volume are provided in the folder
 'Bubbler Test 8'. **Gas Temperature** * .spe and .spa files from
 the Echellle spectrometer are provided in seperate folders. * The
 operational parameters are given in the Readme file found alongside these
 folders. * The .spa/.spe files include two numbers seperated by a dash in
 the form A-B.spa/e. * A = applied voltage given by the function generator
 in V. * B = the applied frequency of the voltage waveform in Hz. * Three
 reference files are also included which prove the background spectra.
 **Current/Voltage** * Here all the .csv files of the current and voltage
 measurements are saved from the oscilloscope. * All the these are done
 with 512 sample averaging. * The data in the .csv files is formatted into
 four columns by time. * Time is in seconds and found in the left column. *
 The next column from the right is the measured voltage of the plasma
 circuit. * Next is the measured current. * The final column on the right
 is a triggering voltage signal to synchronize the sample averaging. - The
 voltage and frequency parameters for each file are provided in
 'Parameters.xlsx'. **Nitrate Colorimetry** * These are the
 colorimetric absorbances used for the 0D model comparison of nitrate
 (NO3). * The parameters for each absorbance .txt file can be found in
 '!Conc.xlsx'. * The absorbance values used to form the standard
 curve are also included in the subfolder 'Standard Curve'. *
 This standard curve is used to convert the absorbance values, found at
 wavelength 330 nm, to concentration. * The absorbance .txt files are of
 the same format as discussed in the Bubble Dynamics portion. **Ozone OAS**
 * These are the gas phase absorbance values used for the 0D model
 comparison of ozone (O3). * The absorbance .txt files are of the same
 format as discussed in the Bubble Dynamics portion. * The operational
 parameters for the absorbances are described in
 '!Parameters.xlsx'. * They are in groups of 31 files, where file
 01 corresponds to t = 0 seconds, or the moment the plasma is first
 ignited. * Each subsequent .txt file is taken 10 seconds after the
 previous file. * Some further details are provided in the associated
 !README.txt'.