Spectroscopic Measurement of the Temperature in the Discharge Gap of Ozonizer

Yagi, Shigenori; Tabata, Norikazu

doi:10.1541/ieejpes1972.96.569

Cited by 5 publications

(5 citation statements)

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“…The self-consistent values of T and x(03)/x(Oz) are estimated to lie within the crossed region of the curves A and B. The gas temperature found in this manner was about the same as that measured spectroscopically (Yagi et al 1976). Also, the values of x ( O ~) / X ( O Z ) agreed with those obtained previously in the study of oxygen-fed ozonisers (Tabata et al 1977a).…”

Section: 2 Determination Of X(oz)/n X(nz)/n X(o3)/n and Tsupporting

confidence: 88%

Mechanism of ozone generation in air-fed ozonisers

Yagi

Tanaka

1979

J. Phys. D: Appl. Phys.

207

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The mechanism of ozone generation in the silent discharge of air-fed ozonisers is studied theoretically and experimentally. The nitrogen oxides (NOx) formed in the silent discharge have been found to play an important role in the process of ozone generation due to the catalytic cycle for O3 destruction: NO+O3 to NO2+O2 and NO2+O to NO+O2. Taking this catalytic cycle into account, a mechanism is proposed to explain the characteristics of ozone generation in air-fed ozonisers. The electron impact dissociation coefficients of O2, N2 and O3 and the gas temperature in the silent discharge are estimated by the computer matching of the theoretical calculations to experimental results.

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Section: 2 Determination Of X(oz)/n X(nz)/n X(o3)/n and Tsupporting

confidence: 88%

Mechanism of ozone generation in air-fed ozonisers

Yagi

Tanaka

1979

J. Phys. D: Appl. Phys.

207

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“…However, a high-temperature heat source (at least 1500 K) is required to excite the rotational levels greater than R (12); it is almost impossible to attain such high temperatures in practical DBD applications. In this experiment, an excited rotational line was observed up to R (7) as shown in figure 3, indicating that the gas temperature could be limited to about 600 K so that lines between R(1) and R (7) were available for analysis. Overlapping due to -doubling at lower rotational levels can be resolved by high-resolution spectrometers, but in order to establish widely accessible diagnostic methods we assembled optical settings with the moderate resolution of 0.3 nm, which provided enough contrast between lower levels of the R lines and entire Q lines throughout the experiment.…”

Section: Analysis Of the 4315 Nm Band Of Chmentioning

confidence: 79%

“…T rot ≈ T g = T 0 + T ave + T st (7) where T rot is the rotational temperature. In this experiment we analysed the net temperature increase ( T ave + T st ) rather than the individual contributions of T ave and T st .…”

Section: Resultsmentioning

confidence: 99%

“…Even though detailed chemical or electrical processes are unknown, the rotational temperature has often been a reference to estimate the gas temperature in a corresponding emission region. For example, temperature determination based on the second positive band of the N 2 or C 2 Swan band have been discussed for DBDs [6,7]. In the analysis of the second positive band of N 2 , although the spectrum resolution was incomplete, the results approached a reasonable value of 290-350 K. On the other hand, the rotational temperature derived from the C 2 Swan band exceeded 2000 K, which was abnormally higher than the expected values in a DBD.…”

Section: Temperature Measurement Of a Microdischargementioning

confidence: 99%

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Optical diagnostics for determining gas temperature of reactive microdischarges in a methane-fed dielectric barrier discharge

Nozaki

Unno

Miyazaki

et al. 2001

J. Phys. D: Appl. Phys.

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The gas temperature of reactive microdischarges has been extensively investigated in a methane-fed dielectric barrier discharge (DBD) configured by a two parallel plate reactor with 0.5 mm gap spacing. Emission spectroscopy of the rotational bands of CH(2Δ→2Π) coupled with heat transfer experiments have been employed for this purpose. Stationary and space-averaged gas temperature between the discharge gap was estimated from the heat transfer experiment; thus heat capacity and enthalpy gained by the feed gas stream resulted in a ≈20 K temperature increase. The rotational temperature showed fairly good sensitivity to the inlet gas temperature variation in the range 370-670 K. However, the local gas temperature increase inside the microdischarges represented an additional 100 K above the average gas temperature, indicating one order of magnitude higher value than the theoretically expected gas temperature increase (5-10 K) for a single microdischarge. High-frequency operation (80 kHz) is responsible for memory effect, thus such a high gas temperature increase was the result of multiple microdischarges rather than a single one.

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“…The gas temperature in the plasma was estimated by evaluating the rotational temperature of nitrogen molecules under the assumption that it was equal to the gas temperature. [22][23][24][25] Figure 5 shows examples of the spectral profiles of nitrogen molecules for the C 3 Å u ! B 3 Å g transition.…”

Section: Methodsmentioning

confidence: 99%

Decrease in Ozone Density of Atmospheric Surface-Discharge Plasma Source

Kobayashi¹,

Tandou²,

Nagaishi³

et al. 2012

Jpn. J. Appl. Phys.

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A surface-discharge plasma source based on dielectric barrier discharge (DBD) has been developed for use in sterilization and cleaning. In these processes, ozone-generation ability is one of the key factors in regard to atmospheric plasma sources. However, it was observed that ozone density decreased during plasma discharge. It is known that an increase in gas temperature decreases the ozone density; thus, the gas temperature in plasma was measured from the rotational temperature of nitrogen molecules. It was confirmed that the gas temperature increases in the case that the ozone density decreases. A dielectric-surface temperature of the plasma source was also measured and its behavior agreed with that of the gas temperature since the thickness of the plasma was small. It is thus confirmed that cooling the dielectric surface of the plasma source is important to increase the ozone density in a surface-discharge plasma source.

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Spectroscopic Measurement of the Temperature in the Discharge Gap of Ozonizer

Cited by 5 publications

References 0 publications

Mechanism of ozone generation in air-fed ozonisers

Mechanism of ozone generation in air-fed ozonisers

Optical diagnostics for determining gas temperature of reactive microdischarges in a methane-fed dielectric barrier discharge

Decrease in Ozone Density of Atmospheric Surface-Discharge Plasma Source

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