Powerpoint on PLASMA EXPERIMENTAL STUDY OF BREAKDOWN OF GAS BY USING DIELECTRIC BARRIER DISCHARGE AT REDUCED ATMOSPHERIC PRESSURE

1. EXPERIMENTAL STUDY OF BREAKDOWN OF GAS BY USING DIELECTRIC
BARRIER DISCHARGE AT REDUCED ATMOSPHERIC PRESSURE
Submitted to
CDP, IOST, TU, Kirtipur, Nepal
By
Ram Lal Sah
Ph.D. Scholar
Date of Registration : 2076-09-15
PhD Reg. No. : 34/2076-077
Submission date: July 4, 2022
Co-supervisors
Prof. Dr. Jeevan Jyoti Nakarmi
and
Dr. Rajendra Shrestha
Supervisor
Assoc. Prof. Dr. Lekha Nath Mishra
THIRD BIANNUAL PROGRESS REPORT

2.  Research objectives
* General objectives
* Specific objectives
 Progresses of the last semester
 On-going works
 Plans for the next semester
 References
 Acknowledgment
CONTENTS
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3. 3
Specific Objectives :
• To design and construct the plasma reactors of different electrode geometry
• To produce the discharge using dielectrics of different thickness at reduced pressure
• To study the nature of the discharge using different type of feed gases (air, N2, O2, and argon)
• To study the effect of electrodes gap and applied voltage on ozone concentration
• To apply in the fields of agriculture and industries
3
General Objective :
Experimental study of breakdown of gas by using dielectric barrier discharge at reduced
atmospheric pressure
RESEARCH OBJECTIVES
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4. Methodology
Determination of plasma parameters by Electrical characterization method
4
By power balance method, electron density (𝒏𝒆) in the plasma is given as [1]
𝒏𝒆 =
𝑷
𝟐𝑨𝒗𝒃𝑬𝒍𝒐𝒔𝒕
- - - - - - - - - - - -(1)
Where P = VI, average power dissipation
A = area of each electrode (19.6 cm2)
Elost = energy ( in eV) lost by electro-ion pair created and
balanced by input power (50 eV)
𝒗𝒃= Bohm velocity (2*103 m/s)
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1. Kogelschatz, U. (1988). Advanced ozone generation. In Process technologies for water treatment (pp.
87-118).
Springer, Boston, MA.
PROGRESSES OF THE LAST SEMESTER

5. 5
5
Calculation of power (P)
(a) V-I method
Power consumed by plasma is given by
𝐏 = 𝒇 𝟎
𝑻
𝑽 𝑰 𝒕 𝒅𝒕 −−−−−−−− −(𝟐)
Where f = frequency of input ac
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(b) Lissajous figure method
Power consumed by plasma is given by
𝐏 = 𝒇 𝑽𝒅𝑸 −− − − −(𝟑)
Where Q= charge given to the plasma per cycle
of ac
For DBD, Lissajous figure is a parallelogram [1]
Fig.1: Lissajous figure for V and Q.
1. Ohno, N., Razzak, M. A., Ukai, H., Takamura, S., & Uesugi, Y. (2006). Validity of electron temperature measurement by using
Boltzmann plot method in
radio frequency inductive discharge in the atmospheric pressure range. Plasma and fusion research, 1, 028-028.

6. i. Electrical characteristics
The typical applied voltage (5 kV) and current waveforms for electrode gap of 2.0 mm at with frequency
20 kHz is
Fig.2: Variations of current and input voltage of DBD
with time.
Fig.3: Lissajous curve for DBD at air gap of
2.0 mm
RESULTS AND
DISCUSSION
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7. Fig.4: Variation of electron density with discharge voltage at 1.5 mm air gap for (a) 10 𝝁𝒔
and (b)25 𝝁𝒔
a
b
RESULTS AND
DISCUSSION
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8. Fig.5: Variation of electron density with discharge voltage at 2.0 mm air gap for (a) 10 𝝁𝒔
and (b)25 𝝁𝒔
a
b
RESULTS AND
DISCUSSION
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9. Fig.6: Variation of electron density with discharge voltage at 2.5 mm air gap for (a) 10 𝝁𝒔 and
(b)25 𝝁𝒔
a
b
RESULTS AND
DISCUSSION
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10. Fig.7: Variation of discharge power with discharge voltage at different air gaps for (a) 10 𝝁𝒔
and (b)25 𝝁𝒔
a
b
RESULTS AND
DISCUSSION
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11. Fig.8: Variation of electron density with discharge power at 1.5 mm air gap for (a) 10 𝝁𝒔
and (b)25 𝝁𝒔
a
b
RESULTS AND
DISCUSSION
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12. Fig.9: Variation of electron density with discharge power at 2.0 mm air gap for (a) 10 𝝁𝒔
and (b)25 𝝁𝒔
a
b
RESULTS AND
DISCUSSION
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13. Fig.10: Variation of electron density with discharge power at 2.5 mm air gap for (a) 10 𝝁𝒔
and (b)25 𝝁𝒔
a
b
RESULTS AND
DISCUSSION
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14. ii. Optical characterization
Calculation of electron temperature in APDBD by line intensity ratio method
Fig.12: Ratio of intensities of selected four spectral
lines as a function of electron temperature
Fig.11: Optical emission spectra of DBD
applied
voltage 3 kV with air gap 2.0 mm.
Te=0.854
eV
RESULTS AND
DISCUSSION
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𝑹𝟏
𝑹𝟐
= 𝟏. 𝟏𝟒 𝒆
−
𝟐.𝟓𝟐𝟒
𝒌𝑩𝑻𝒆 Te=0.854 eV for 𝑹𝟏 / 𝑹𝟐 =1.28 from
exp
𝐑𝟏
𝐑𝟐
=
𝐈𝟏
𝐈𝟐
𝐈𝟑
𝐈𝟒
=
𝐀𝐩𝐪
𝐀𝐫𝐬
𝐠𝐩
𝐠𝐫
𝛌𝐫𝐬
𝛌𝐩𝐪
𝐀𝐮𝐯
𝐀𝐱𝐲
𝐠𝐮
𝐠𝐱
𝛌𝐱𝐲
𝛌𝐮𝐯
𝐞𝐱𝐩. −
𝐄𝐩 − 𝐄𝐫 − 𝐄𝐱 + 𝐄𝐮
𝐤𝐁𝐓𝐞

15. Fig.14: Lorentzian fit for the measurement of full
width at half maxima (∆λStark) for the
determination of electron density
stark=2.45 nm
ne= 8.63×1016 m-3
Estimation of electron density by analysis of Ar I line 696.54 nm (Stark Broadening Method)
Fig.13: Optical emission spectra of DBD
applied
voltage 3 kV with air gap 2.0 mm.
RESULTS AND
DISCUSSION
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𝐧𝐞 =
𝚫𝛌𝐬𝐭𝐚𝐫𝐤
𝟐 × 𝟏𝟎−𝟏𝟏
𝟑
𝟐

16.  Discharge power, discharge current and electron density depend on the applied
voltage for same dielectric and air gap
 Number of filaments and their peak values depend on applied voltage
 Discharge power is affected by the number of micro-discharges
 Te= 0.854 eV by line intensity ratio for applied voltage 3 kV with air gap 2.0 mm.
 By Stark broadening method, electron density is found to 8.63×1016 m-3
CONCLUSIONS
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17. Ram Lal Saha,b , Arun Kumar Shaha, Saddam Husain Dhobia,d , Bablu kant Thakura,f, Rajendra
Shresthaa,c, Jeevan Jyoti Nakarmie, & Lekha Nath Mishraa
aDepartment of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal
bDepartment of Physics, Padmakanya Multiple Campus, Tribhuvan University, Kathmandu-44600,
Nepal
cDepartment of Physics, Nepal Banepa Polytechnic Institute, Banepa, Kavre-45210, Nepal
dRobotics Academy of Nepal, Lalitpur-44700, Nepal
eDepartment of Physics, Tri-Chandra Multiple Campus, Tribhuvan University, Kathmandu-44600,
Nepal
fDepartment of Physics, Tri-Chandra Multiple Campus, Tribhuvan University, Kathmandu-44600,
Nepal
Investigation of Plasma Parameters of Dielectric Barrier
Discharge Plasma at Atmospheric Pressure
2nd International Conference on Plasma Theory and Simulations (PTS -2022) 20 – 21 June, 2022
Department of Physics, University of Lucknow, India
ACHIEVEME
NT
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18.  Improving lab setup for plasma reactor at reduced atmospheric pressure
 Collecting data for electrical and characterization of plasma at atmospheric pressure
 Analyzing data and preparing for writing manuscript
 Going through some scientific journal articles and thesis for search and review
ON-GOING
WORK
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19. PLANNING FOR THE NEXT
SEMESTER
 The DBD plasma reactor will be designed at reduced pressure
 Nature of DBD with different feed gases (Argon, Air, N2, and O2) at reduce
pressure will be studied
 The electrical and optical characteristics of DBD will be studied with optical
emission spectroscope
 The produced plasma will be used in agricultural field
 Going through some scientific journal articles and thesis for search and review
 Data will be analyses for articles publication
 Participate in international seminars (Participation and dissemination of results
in national and international seminars)
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20. 1. Sarkar, S. C., Verma, N., & Tiwari, P. K. (2021). Electrical Discharges: An Emerging Modality in
Sterilization, Disinfection, and Therapeutics. Majlesi Journal of Telecommunication Devices, (1).
2. Langmuir, I. (1928). Oscillations in ionized gases. Proceedings of the National Academy of Sciences
of the United States of America, 14(8), 627.
3. Kogelschatz, U. (2003). Dielectric-barrier discharges: their history, discharge physics, and industrial
applications. Plasma chemistry and plasma processing, 23(1), 1-46.
3. Eliasson, B., Hirth, M., & Kogelschatz, U. (1987). Ozone synthesis from oxygen in dielectric barrier
discharges. Journal of Physics D: Applied Physics, 20(11), 1421.
4. Baniya, H. B., Guragain, R. P., Baniya, B., & Subedi, D. P. (2020). Experimental study of cold
atmospheric pressure plasma jet and its application in the surface modification of
polypropylene. Reviews of Adhesion and Adhesives, 8(2), S1-S14.
5. Kogelschatz, U. (1988). Advanced ozone generation. In Process technologies for water
treatment (pp. 87-118). Springer, Boston, MA.
6. Ohno, N., Razzak, M. A., Ukai, H., Takamura, S., & Uesugi, Y. (2006). Validity of electron temperature
measurement by using Boltzmann plot method in radio frequency inductive discharge in the
atmospheric pressure range. Plasma and fusion research, 1, 028-028.
REFEREN
CES
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21. Assoc. Prof. Dr. Lekha Nath Mishra (Supervisor)
Prof. Dr. Jeevan Jyoti Nakarmi and
Dr. Rajendra Shrestha (Co-supervisors)
Research committee members
CDP members
UGC for financial supports
Mr. Arun Kumar Shah and my all colleagues, my family members and my relatives.
All members of Patan Multiple Campus
ACKNOWLEDGEMENT
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