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Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Imprimir: 0276-1459
ISSN En Línea: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.2020031514
pages 47-60

DEGREASING TECHNOLOGY WITH OZONE MICRO-BUBBLES GENERATED BY A VENTURI TUBE

Yu Ruoyi
Graduate School of System and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki, Japan
Keita Fujii
Graduate School of System and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki, Japan
Akiko Kaneko
University of Tsukuba, Department of Engineering Mechanics and Energy, Graduate School of System and Information Engineering, 1-1-1, Tennoudai, Tsukuba, Ibaraki, 305-8573, Japan
Yutaka Abe
University of Tsukuba, Department of Engineering Mechanics and Energy, Graduate School of System and Information Engineering, 1-1-1, Tennoudai, Tsukuba, Ibaraki, 305-8573, Japan
Masatoshi Ike
Apptex, LLC, Tsuchiura, Ibaraki, Japan

SINOPSIS

As one of the cleaning processes for plating technology, degreasing uses organic solvents and alkali aqueous solutions, though these are costly and have severe environmental impacts because of the sewage disposal. Therefore, cheaper and more eco-friendly degreasing technology is in high demand. Ozone microbubbles, generated using a Venturi tube, have been proposed for degreasing because of their strong oxidizing and self-decomposing power. The purpose of this study is to research the capability of ozone microbubbles and improve the cleaning mechanism. In this study, we focus on microbubble generation using a Venturi tube. The bubble diameters were measured and compared at the inlet and outlet of a straight tube and a Venturi tube. Bubbles were detected by visual observation and measured using image processing software. Compared to the straight tube, the Venturi tube generated much smaller bubbles, whose diameters were approximately 100-120 μm. Through titration with potassium iodide, ozonated water concentrations and ozone gas concentrations were measured under the same conditions. Ozone gas dissolved well through the Venturi tube. Also, brass test plates applied with cutting oil were washed using a flow of ozone microbubbles. It was confirmed that the Venturi tube yielded much better oil-washing capabilities than the straight tube.

REFERENCIAS

  1. Arai, K., High Performance Cleaning Technology with Ozone Microbubbles, Master's, University of Tsukuba, 2016.

  2. Fujiwara, A., Okamoto, K., Hashiguchi, K., Peixinho, J., Takagi, S., and Matsumoto, Y., Bubble Breakup Phenomena in a Venturi Tube, Proc. of 5th Joint ASME/JSME Fluids Engineering Summer Conf., San Diego, pp. 553-560,2007.

  3. Gordiychuk, A., Svanera, M., Benini, S., and Poesio, P., Size Distribution and Sauter Mean Diameter of Micro Bubbles for a Venturi Type Bubble Generator, Exp. Thermal Fluid Sci., vol. 70, pp. 51-60,2016.

  4. Miwa, S., Kondo, H., Hiroyuki, O., and Yoshito, O., Characteristics of Vulcanized EPDM Degradation in Ozone Water or Ozone/Chlorine Water, Soc. Rubber Sci. Technol, Jpn, vol. 81, no. 1, pp. 14-18,2008.

  5. Shangguan, Y., Yu, S., Gong, C., Wang, Y., Yang, W., and Hou, L., A Review of Microbubble and its Applications in Ozonation, IOP Conf. Series: Earth and Environmental Science, Vol. 128, Beijing, China, Dec. 28-31,2017.

  6. Takahashi, M., The Z Potential of Microbubbles in Aqueous Solutions: Electrical Properties of the Gas-Water Interface, J Phys. Chem. B, vol. 109, pp. 21858-21864, 2005.

  7. Tamura, N., Kaneko, A., and Uezawa, S., Development of Non-Chemical Micro-Bubble Washing Technology Using a Venturi Tube, Multiphase Flow, vol. 27, no. 5, pp. 577-584, 2014.

  8. Tano, Y., Iizuka, A., Shiba, E., and Nakamura, T., Physical Washing Method for the Removal of Press Oil Using the High-Speed Movement of Microbubbles under Ultrasonic Irradiation, Ind. Eng. Chem. Res., vol. 52, pp. 15658-15663,2013.

  9. Yao, K., Chi, Y., Wang, F., Yan, J., Ni, M., and Cen, K., The Effect of Microbubbles on Gas-Liquid Mass Transfer Coefficient and Degradation Rate of COD in Wastewater Treatment, Water Sci. Technol., vol. 73, no. 8, pp. 1969-1977, 2016.

  10. Yin, J. and Li, J., Experimental Study on the Bubble Generation Characteristics for a Venturi Type Bubble Generator, Int. J. HeatMass Transfer, vol. 91, pp. 218-224, 2015.

  11. Zhang, J., Huang, G., Liu, C., Zhang, R.-N., Chen, X.-X., and Zhang, L., Synergistic Effect of Microbubbles and Active Carbon on the Ozonation Treatment of Synthetic Dyeing Wastewater, Sep. Purif. Technol., vol. 201, pp. 10-18,2018.


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