Browsing by Author "Chiang, M-H"

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Effect of plasma chemistry on the simulation of helium atmospheric-pressure plasmas
(2011-01-01)
Chiu, Y-M
;
Hung, C-T
;
Hwang, F-N
;
Chiang, M-H
;
Wu, J. -S
The effect on the selection of different plasma chemistries for simulating a typical dielectric barrier discharge (DBD) driven by quasi-pulsed power source (20 kHz) is investigated The numerical simulation was performed by using the one-dimensional self-consistent fluid modeling solver Our simulation result indicates that the computed temporal current density can be significantly improved by using a complex version of plasma chemistry module rather than the simple one and demonstrates an excellent agreement with the experimental data The result suggests the metastable excited and ionic helium related reaction channels which are important in simulating a DBD should be taken into account Furthermore it also reveals that the power absorption of ions is considerably higher than that of the electron (C) 2010 Elsevier B V All rights reserved
Effects of Oxygen Addition and Treating Distance on Surface Cleaning of ITO Glass by a Non-Equilibrium Nitrogen Atmospheric-Pressure Plasma Jet
(2010-10-01)
Chiang, M-H
;
Liao, K-C
;
Lin, I-M
;
Lu, C-C
;
Huang, H-Y
Effects of oxygen addition and treating distance on cleaning organic contaminants on stationary and non-stationary (1-9 cm/s) ITO glass surfaces by a parallel-plate nitrogen-based dielectric barrier discharge (DBD) are investigated experimentally; the DBD is driven by a 60 kHz bipolar quasi-pulsed power source. The results show that two regimes of favorable operating condition for improving the hydrophilic property of the surface (reducing the contact angle from 84 degrees to 25-30 degrees) are found. The measured spatial distribution of NO-gamma UV emission, O(3) concentration and OES spectra are shown to strongly correlate with the measured hydrophilic property. At the near jet downstream locations (z < 10 mm), the metastable N(2)(A(3)Sigma(+)(mu)) and photo-induced dissociation of ozone play dominant roles in cleaning the ITO glass surface; while at the far jet downstream locations (z > 10 mm), where the ratio of oxygen to nitrogen is lower, only the long-lived metastable N(2)(A(3)Sigma(+)(mu) ) plays a major role in cleaning the ITO glass surface.
Effects of Oxygen Addition and Treating Distance on Surface Cleaning of ITO Glass by a Non-Equilibrium Nitrogen Atmospheric-Pressure Plasma Jet
(2010-10-01)
Chiang, M-H
;
Liao, K-C
;
Lin, I-M
;
Lu, C-C
;
Huang, H-Y
Effects of oxygen addition and treating distance on cleaning organic contaminants on stationary and non-stationary (1-9 cm/s) ITO glass surfaces by a parallel-plate nitrogen-based dielectric barrier discharge (DBD) are investigated experimentally; the DBD is driven by a 60 kHz bipolar quasi-pulsed power source. The results show that two regimes of favorable operating condition for improving the hydrophilic property of the surface (reducing the contact angle from 84 degrees to 25-30 degrees) are found. The measured spatial distribution of NO-gamma UV emission, O(3) concentration and OES spectra are shown to strongly correlate with the measured hydrophilic property. At the near jet downstream locations (z < 10 mm), the metastable N(2)(A(3)Sigma(+)(mu)) and photo-induced dissociation of ozone play dominant roles in cleaning the ITO glass surface; while at the far jet downstream locations (z > 10 mm), where the ratio of oxygen to nitrogen is lower, only the long-lived metastable N(2)(A(3)Sigma(+)(mu) ) plays a major role in cleaning the ITO glass surface.
One-dimensional simulation of nitrogen dielectric barrier discharge driven by a quasi-pulsed power source and its comparison with experiments
(2011-01-01)
Cheng, K-W
;
Hung, C-T
;
Chiang, M-H
;
Hwang, F-N
;
Wu, J-S
Parallel-plate nitrogen dielectric barrier discharge (DBD) driven by a quasi-pulsed power source (60 kHz) is simulated using a fully-implicit 1D self-consistent fluid modeling code Simulated discharged currents of gap distances (0 5 07 and 1 0 mm) agree very well with measured data while simulated discharged currents of wider gap distance (1 2 mm) fail to reproduce the measured data It is found that the discharge mode is homogeneous Townsend-like for the former case while it is filamentary-like for the latter case based on the experimental observation These findings demonstrate that previous numerical studies showing mode transition by changing the gap distance may require further investigation (C) 2010 Elsevier B V All rights reserved