Abstract
Non-thermal plasma is generated by excitation of the electron in gas or liquid medium. This technique has been applied to many industrial fields, especially for water treatment, because of the byproducts generated electrochemically by high-voltage discharge. Simultaneous production of plasma and bubbles is one of the methods to efficiently reduce the required energy for water treatment. The flow rate of injected gas and supplied electric energy are important parameters. In this study, the characteristics of the continuously generated bubbles with non-thermal plasma discahrge were investigated by experiment. The behavior of bubbles with and without discharge was analyzed by image processing. To verify the water treatment yield of bubbles with plasma generating byproducts, the decomposition of organic dye was investigated and analyzed. Due to the reduction of the surface tension of the interface, the volume of bubble with discharge showed shorter departure time with smaller volume. Bubbles with plasma discharge have faster bubble rising velocity, due to more spherical shape, which lowers the possibility of coalescence between bubbles, and is more effective for water treatment. The higher coalescence probability caused by increased Reynolds number resulted in the reduction of water treatment yield.
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Abbreviations
- A :
-
Calibration constant
- C :
-
Concentration
- ΔC :
-
Change of concentration
- I :
-
Current
- I abs :
-
Absorbance
- n coal :
-
The number of coalescence between bubbles
- n bub :
-
The number of production of bubbles
- P E :
-
Electric power
- P M :
-
Mechanical power
- Q :
-
Flow rate of gas
- R :
-
Radius of orifice
- Re :
-
Reynolds number in orifice
- T sat :
-
Saturated temperature
- T o :
-
Room temperature
- ΔT :
-
Temperature difference
- tt :
-
Time
- U a :
-
Applied electric potential
- U m :
-
Measured electric potential
- u :
-
Velocity of orifice
- u o :
-
Mean velocity
- Y E :
-
Electric yield
- Y m :
-
Mechanical yield
- Y :
-
Probability of coalescence between bubbles
- θ :
-
Contact angle of bubble
- λ :
-
Wave length
- μ :
-
Dynamic viscosity
- ρ :
-
Density
- T :
-
Dummy variable for time
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Acknowledgments
This work was supported by the Basic Science Research Program through the National Research Foundation (NRF), Korea (2019R1A2C2003176), funded by the Korean Government and Korea Institute for Advancement of Technology (KIAT) grant funded by the Korean Government (MOTIE) (P0008458, The Competency Development Program for Industry Specialist).
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Jae Won Lee is a graduate student of the School of Mechanical Engineering, Sungkyunkwan University, Suwon, Korea. He received his B.S. in Mechanical Engineering from Sungkyunkwan University. His research interests include computational fluid dynamics (CFD) about muti-physics system including electric effect inside the flow field.
Dong Kee Sohn is a Research Professor at the School of Mechanical Engineering, Sungkyunkwan University. He received his Ph.D. in Mechanical Engineering from Seoul National University in 1997. His research interests include experiments for heat and fluid system.
Han Seo Ko is a Professor at the school of Mechanical Engineering, Sungkyunkwan University. He received his Ph.D. in Mechanical Engineering from Texas A&M University in 1998. His research interests include flow control, microfluidics, optical tomography, micro-droplet ejection and heat and mass control.
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Lee, J.W., Ji, Y.Y., Sohn, D.K. et al. Enhancement of continuous bubbles by non-thermal plasma for water treatment. J Mech Sci Technol 35, 2503–2511 (2021). https://doi.org/10.1007/s12206-021-0521-4
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DOI: https://doi.org/10.1007/s12206-021-0521-4