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Experimental and Computational Multiphase Flow

, Volume 1, Issue 3, pp 177–185 | Cite as

A visualized study of bubble breakup in small rectangular Venturi channels

  • Jiang Huang
  • Licheng SunEmail author
  • Zhengyu MoEmail author
  • Hongtao Liu
  • Min Du
  • Jiguo Tang
  • Jingjing Bao
Research Article
  • 54 Downloads

Abstract

Venturi channels taken as bubble generators own merits of simplicity in structure, high efficiency, and high reliability. A visualized investigation was carried out on bubble transportation and breakup in two small rectangular Venturi channels with the throat sizes of 1 mm × 1 mm and 1 mm × 2 mm, respectively. Experiments were conducted under ambient conditions with air and water as the working fluids. The experimental results indicate that bubble transportation and breakup in the Venturi channel with the throat size of 1 mm × 1 mm presents some different features compared with the other one: under the same average liquid velocity in the throat, bubbles own higher initial velocity than the average liquid velocity before entering the diverging section, and remain this trend till they are split; a binary breakup occurs to the bubbles prior to their final collapse in the recirculation region due to the jet flow in the backward of the bubbles. The bubble transportation and breakup in the Venturi channel with the throat size of 1 mm × 2 mm shows similar characteristics with that in a conventional Venturi channel. Overall, Venturi with smaller size presents a better performance in producing fine bubbles.

Keywords

bubble breakup deceleration jet flow visualized study 

Notes

Acknowledgements

The authors are profoundly grateful to the financial supports of the National Natural Science Foundation of China (Grant Nos. 51709191, 51706149, and 51506099).

References

  1. Agarwal, A., Ng, W. J., Liu, Y. 2011. Principle and applications of microbubble and nanobubble technology for water treatment. Chemosphere, 84: 1175–1180.CrossRefGoogle Scholar
  2. Fujiwara, A., Okamoto, K., Hashiguchi, K., Peixinho, J., Takagi, S., Matsumoto, Y. 2007. Bubble breakup phenomena in a Venturi tube. In: Proceedings of the ASME/JSME 2007 5th Joint Fluids Engineering Conference, 553–560.Google Scholar
  3. Fujiwara, A., Takagi, S., Watanabe, K., Matsumoto, Y 2003. Experimental study on the new micro-bubble generator and its application to water purification system. In: Proceedings of the ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference, 469–473.Google Scholar
  4. Gordiychuk, A., Svanera, M., Benini, S., Poesio, P. 2016. Size distribution and Sauter mean diameter of micro bubbles for a Venturi type bubble generator Exp Therm Fluid Sci, 70: 51–60.CrossRefGoogle Scholar
  5. Huang, J., Sun, L. C., Du, M., Liang, Z., Mo, Z. Y., Tang, J. G., Xie, G. 2019. An investigation on the performance of a micro-scale Venturi bubble generator Chem Eng J, https://doi.org/10.1016/j.cej.2019.02.068.Google Scholar
  6. Huang, J., Sun, L. C., Du, M., Mo, Z. Y., Zhao, L. 2018. A visualized study of interfacial behavior of air-water two-phase flow in a rectangular Venturi channel Theor Appl Mech Lett, 8: 334–344.CrossRefGoogle Scholar
  7. Ivany, R. D., Hammitt, F. G., Mitchell, T. M. 1966. Cavitation bubble collapse observations in a Venturi J Basic Eng, 88: 649–657.CrossRefGoogle Scholar
  8. Kawamura, T., Fujiwara, A., Takahashi, T., Kato, H, Matsumoto, Y., Kodama, Y. 2004. The effects of the bubble size on the bubble dispersion and skin friction reduction. In: Proceedings of the 5th Symposium on Smart Control of Turbulence, 145–151.Google Scholar
  9. Khuntia, S., Majumder, S. K., Ghosh, P. 2012. Microbubble-aided water and wastewater purification: A review Rev Chem Eng, 28: 191–221.CrossRefGoogle Scholar
  10. Kondo, K., Yoshida, K., Matsumoto, T., Okawa, T., Kataoka, I. 2002. Flow patterns of gas-liquid two-phase flow in round tube with sudden expansion. In: Proceedings of the 10th International Conference on Nuclear Engineering, 179–186.Google Scholar
  11. Lau, Y. M., Bai, W., Deen, N. G, Kuipers, J. A. M. 2014. Numerical study of bubble break-up in bubbly flows using a deterministic Euler-Lagrange framework Chem Eng Sci, 108: 9–22.CrossRefGoogle Scholar
  12. Li, J. J., Song, Y. C., Yin, J. L., Wang, D. Z. 2017. Investigation on the effect of geometrical parameters on the performance of a Venturi type bubble generator Nucl Eng Des, 325: 90–96.CrossRefGoogle Scholar
  13. Li, X. L., Ma, X. W., Zhang, L., Zhang, H. C. 2016. Dynamic characteristics of ventilated bubble moving in micro scale venturi Chem Eng Process, 100: 79–86.CrossRefGoogle Scholar
  14. Liao, Y. X., Lucas, D. 2009. A literature review of theoretical models for drop and bubble breakup in turbulent dispersions Chem Eng Sci, 64: 3389–3406.CrossRefGoogle Scholar
  15. Nishi, W., Nogami, M., Takahira, H. 2011. Bubble dynamics observed in a gas-liquid Venturi flow. In: Proceedings of the ASME-JSME-KSME2011 Joint Fluids Engineering Conference, 2: 191–197.Google Scholar
  16. Nomura, Y., Uesawa, S., Kaneko, A., Abe, Y. 2011. Study on bubble breakup mechanism in a Venturi tube. In: Proceedings of the ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, 1: 2533–2540.Google Scholar
  17. Reichmann, F., Koch, M.-J., Kockmann, N. 2017. Investigation of bubble breakup in laminar, transient, and turbulent regime behind micronozzles. In: Proceedings of the ASME 2017 15th International Conference on Nanochannels, Microchannels, and Minichannels, V001T03A001.Google Scholar
  18. Soli, K. W., Yoshizumi, A., Motomatsu, A., Yamakawa, M., Yamasaki, M., Mishima, T., Miyaji, N., Honjoh, K. I., Miyamoto, T. 2010. Decontamination of fresh produce by the use of slightly acidic hypochlorous water following pretreatment with sucrose fatty acid ester under microbubble generation Food Control, 21: 1240–1244.CrossRefGoogle Scholar
  19. Sun, L. C., Mo, Z. Y, Zhao, L., Liu, H. T., Guo, X., Ju, X. F., Bao, J. J. 2017. Characteristics and mechanism of bubble breakup in a bubble generator developed for a small TMSR Ann Nucl Energy, 109: 69–81.CrossRefGoogle Scholar
  20. Warjito, Mochizuki, O., Kiya, M. 2002. Bubbly flow undergoing a steep pressure gradient Exp Fluids, 33: 620–628.CrossRefGoogle Scholar
  21. Xu, Q. Y., Nakajima, M., Ichikawa, S., Nakamura, N, Shiina, T. 2008. A comparative study of microbubble generation by mechanical agitation and sonication Innov Food Sci Emerg, 9: 489–494.CrossRefGoogle Scholar
  22. Yin, J. L., Li, J. J., Li, H, Liu, W., Wang, D. Z. 2015. Experimental study on the bubble generation characteristics for an Venturi type bubble generator Int J Heat Mass Transfer, 91: 218–224.CrossRefGoogle Scholar
  23. Zhao, L., Mo, Z. Y., Sun, L. C., Xie, G., Liu, H. T., Du, M., Tang, J. G 2017. A visualized study of the motion of individual bubbles in a Venturi-type bubble generator Prog Nucl Energ, 97: 74–89.CrossRefGoogle Scholar
  24. Zhao, L., Sun, L. C., Mo, Z. Y., Tang, J. G., Hu, L. Y., Bao, J. J. 2018. An investigation on bubble motion in liquid flowing through a rectangular Venturi channel Exp Therm Fluid Sci, 97: 48–58.CrossRefGoogle Scholar

Copyright information

© Tsinghua University Press 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & HydropowerSichuan UniversityChengduChina

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