Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Generation of emulsions due to the impact of surfactant-laden droplet on a viscous oil layer on water

벤츄리 노즐 출구 형상과 작동 조건에 따른 캐비테이션 기포 발생 특성 연구

  • Changhoon Oh (Department of Mechanical & Automotive Engineering, SeoulTech) ;
  • Joon Hyun Kim (NDT Research Center, SeoulTech) ;
  • Jaeyong Sung (Department of Mechanical & Automotive Engineering, SeoulTech)
  • Received : 2023.02.15
  • Accepted : 2023.03.22
  • Published : 2023.03.31
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Abstract

Three design parameters were considered in this study: outlet nozzle angle (30°, 60°, 80°), neck length (1 mm, 3 mm), and flow rate (0.5, 0.6, 0.7, 0.8 lpm). A neck diameter of 0.5 mm induced cavitation flow at a venture nozzle. A secondary transparent chamber was connected after ejection to increase bubble duration and shape visibility. The bubble size was estimated using a Gaussian kernel function to identify bubbles in the acquired images. Data on bubble size were used to obtain Sauter's mean diameter and probability density function to obtain specific bubble state conditions. The degree of bubble generation according to the bubble size was compared for each design variable. The bubble diameter increased as the flow rate increased. The frequency of bubble generation was highest around 20 ㎛. With the same neck length, the smaller the CV number, the larger the average bubble diameter. It is possible to increase the generation frequency of smaller bubbles by the cavitation method by changing the magnification angle and length of the neck. However, if the flow rate is too large, the average bubble diameter tends to increase, so an appropriate flow rate should be selected.

Keywords

Acknowledgement

이 연구는 2022년 한국연구재단 개인기초연구사업(기본연구) 과제번호 2022R1F1A1071016의 연구비 지원으로 수행되었습니다.

References

  1. Dular, M., Griessler-Bulc, T., Gutierrez-Aguirre, I., Heath, E., Kosjek, T., Klemencic, A. K., Oder, M., Petkovsek, M., Racki, N., Ravnikar, M., Sarc, A., Sirok, B., Zupanc, M., Zitnik, M. and Kompare, B., 2016, "Use of Hydrodynamic Cavitation in (waste)Water Treatment," Ultrasonics Sonochemistry, Vol. 29, pp.577~588. https://doi.org/10.1016/j.ultsonch.2015.10.010
  2. Sung, G., Sung, J. and Lee, M. H., 2016, "Development and Performance Test of a Micro Bubble Irrigation System for Root Canal Cleaning of Tooth," Journal of The Korean Society of Visualization, Vol. 14(1), pp.40~45. https://doi.org/10.5407/JKSV.2016.14.1.040
  3. Fujiwara, A., Takagi, S., Watanabe, K. and Matsumoto, Y., 2003, "Experimental Study on the New Micro-Bubble Generator and Its Application to Water Purification System," ASME FEDSM'03 4th ASME-JSME Joint Fluids Engineering Conference USA, FEDSM 2003-45162, pp.469~473.
  4. Zhao, L., Mo, Z., Sun, L., Xie, G., Liu, H., Du, M. and Tang, J., 2017, "A Visualized Study of the Motion of Individual Bubbles in a Venturi-Type Bubble Generator," Progress in Nuclear Energy, Vol. 97, pp.74~89. https://doi.org/10.1016/j.pnucene.2017.01.004
  5. Afisna, L. P., Juwanac, W. E., Indarto, Deendarlianto and Nugroho, F. M., 2017, "Performance of Porous-Venturi Microbubble Generator for Aeration Process," Journal of Energy Mechanical Material and Manufacturing Engineering, Vol. 2(2), pp.73~80. https://doi.org/10.22219/jemmme.v2i2.5054
  6. Juwana, W. E., Widyatama, A., Dinaryanto, O., Budhijanto, W., Indarto and Deendarlianto, 2019, "Hydrodynamic Characteristics of the Microbubble Dissolution in Liquid Using Orifice Type Microbubble Generator," Chemical Engineering Research and Design, Vol. 141, pp.436~448. https://doi.org/10.1016/j.cherd.2018.11.017
  7. Sakamatapan, K., Mesgarpour, M., Mahian, O., Ahn, H. S. and Wongwises, S., 2021, "Experimental Investigation of the Microbubble Generation Using a Venturi-Type Bubble Generator," Case Studies in Thermal Engineering, Vol. 27, 101238.
  8. Bae, H., Lee, S., Song, M., Sung, J., 2019, "Flow Visualizations and Analysis on Characteristics of Bubbly Flows Exhausted from a Venturi-Type Bubble Generator with an Air Vent," Journal of the Korean Society of Visualization, Vol. 17(1), pp.8-15.
  9. Lee, C. H., Choi, H., Jerng, D-W., Kim, D. E., Wongwises, S. and Ahn, H. S., 2019, "Experimental Investigation of Microbubble Generation in the Venture Nozzle," International Journal of Heat and Mass Transfer, Vol. 136, pp.1127~1138. https://doi.org/10.1016/j.ijheatmasstransfer.2019.03.040
  10. Li, J., Song, Y., Yin, J. and Wang, D., 2017, "Investigation on the Effect of Geometrical Parameters on the Performance of a Venturi Type Bubble Generator," Nuclear Engineering and Design, Vol. 325, pp.90~96. https://doi.org/10.1016/j.nucengdes.2017.10.006
  11. Brandner, P. A., Wright, G., Pearce, B., Goldsworthy, L. and Walker G. J., 2010, "An Experimental Investigation of Micro Bubble Generation in a Confined Turbulent Jet," 17th Australasian Fluid Mechanics Conference Auckland.
  12. Li, M., Bussonniere, A., Bronson, M., Xu, Z. and Liu, Q., 2019, "Study of Venturi Tube Geometry on the Hydrodynamic Cavitation for the Generation of Microbubbles," Minerals Engineering, Vol. 132, pp.268~274. https://doi.org/10.1016/j.mineng.2018.11.001
  13. Brinkhorst, S., von Lavante, E. and Wendt, G., 2015, "Numerical Investigation of Cavitating Herschel Venturi-Tubes Applied to Liquid Flow Metering," Flow Measurement and Instrumentation, Vol. 43, pp.23~33. https://doi.org/10.1016/j.flowmeasinst.2015.03.004