Design and Performance of Swirl Flow Microbubble Generator

 
 
 
  • Abstract
  • Keywords
  • References
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  • Abstract


    The design of a microbubble generator that has high efficiency and good performance is still a challenge today, especially for a large scale application. In this study, CFD simulation based on the transient operation was used to predict the characteristics of a fluid flow as a reference in the design process. To analyze the performance of the swirl flow microbubble generator, particle image velocimetry (PIV) was used to characterize the dimension and distribution of microbubbles. Based on the simulation results, CFD was able to visualize the mixing process and the fluid characteristics of the gas-liquid flow in a swirl flow microbubble generator. Air self-suction mechanism in a microbubble generator nozzle was successfully formed by a negative pressure in the central axis area of the nozzle due to a swirl flow of water. It shows that a swirl flow microbubble generator can work efficiently and doesn’t need any other devices to deliver air into the system. Based on the PIV measurement, the microbubbles were successfully formed with the radius averaged of 25 µm for both air mass flow rate of 0.25 l/min and 1 l/min. However, the smaller the mass flow rate of air, the more the number of microbubbles generated.

     

     


     

  • Keywords


    CFD, microbubble, unsteady, swirl flow, particle image velocimetry.

  • References


      [1] S. Calgaroto, A. Azevedo, and J. Rubio, “Flotation of quartz particles assisted by nanobubbles,” Int. J. Miner. Process., vol. 137, pp. 64–70, 2015.

      [2] X. Li, H. Xu, J. Liu, J. Zhang, J. Li, and Z. Gui, “Cyclonic state micro-bubble flotation column in oil-in-water emulsion separation,” Sep. Purif. Technol., vol. 165, pp. 101–106, 2016.

      [3] P. Basařová, T. Váchová, G. Moore, G. Nannetti, and J. Pišlová, “Bubble adhesion onto the hydrophobic surface in solutions of non-ionic surface-active agents,” Colloids Surfaces A Physicochem. Eng. Asp., vol. 505, pp. 64–71, 2016.

      [4] S. Tabassum, Y. Zhang, and Z. Zhang, “An integrated method for palm oil mill effluent (POME) treatment for achieving zero liquid discharge - A pilot study,” J. Clean. Prod., vol. 95, pp. 148–155, 2015.

      [5] D. Druzinec, D. Salzig, M. Kraume, and P. Czermak, “Micro-bubble aeration in turbulent stirred bioreactors: Coalescence behavior in Pluronic F68 containing cell culture media,” Chem. Eng. Sci., vol. 126, pp. 160–168, 2015.

      [6] A. Endo et al., “DO-increasing effects of a microscopic bubble generating system in a fish farm,” Mar. Pollut. Bull., vol. 57, no. 1–5, pp. 78–85, 2008.

      [7] K. Ebina et al., “Oxygen and Air Nanobubble Water Solution Promote the Growth of Plants, Fishes, and Mice,” PLoS One, vol. 8, no. 6, pp. 2–8, 2013.

      [8] A. Agarwal, W. J. Ng, and Y. Liu, “Principle and applications of microbubble and nanobubble technology for water treatment,” Chemosphere, vol. 84, no. 9, pp. 1175–1180, 2011.

      [9] D. E. Zipperian, “Method and apparatus for generating microbubbles in froth flotation mineral concentration systems.” European Patent Applications, Publication Number: 0364654A2, Date of Patent: Feb. 22, 1989.

      [10] C. Iwaki, K. Aoki, H. Komita, “Microbubble Generating Apparatus And Method,” United States Patent, Patent No.: US 8,678,356 B2, Date of Patent : Mar. 25, 2014.

      [11] H. Ohnari, “Swirling Type Micro-Bubble Generating System,” United States Patent, Patent No.: US 7,472,893 B2, Date of Patent: Jan. 6, 2009.

      [12] Takase and H. Tsutsumi, “Microbubble Generating Apparatus,” United States Patent, Patent No.: US 8,939,436 B2, Date of Patent: Jan. 27, 2015.

      [13] J. Wang, H. Zha, J. M. McDonough, and D. Zhang, “Analysis and numerical simulation of a novel gas-liquid multiphase scroll pump,” Int. J. Heat Mass Transf., vol. 91, pp. 27–36, 2015.

      [14] Y. Zou, S. Ye, Y. Wang, and W. Fei, “CFD simulation and PIV measurement of liquid-liquid two-phase flow in pump-mix mixer,” J. Taiwan Inst. Chem. Eng., vol. 60, pp. 15–25, 2016.

      [15] S. Huang, X. Su, J. Guo, and L. Yue, “Unsteady numerical simulation for gas-liquid two-phase flow in self-priming process of a centrifugal pump,” Energy Convers. Manag., vol. 85, pp. 694–700, 2014.

      [16] G. Yuan, L. Zhang, H. Zhang, and Z. Wang, “Numerical and experimental investigation of the performance of the liquid – gas and liquid jet pumps in desalination systems,” DES, vol. 276, no. 1–3, pp. 89–95, 2011.

      [17] H. S. Alam, Bahrudin, A. T. Sugiarto and G. G. Redhyka, "Unsteady numerical simulation of gas-liquid flow in dual chamber microbubble generator," 2017 2nd International Conference on Automation, Cognitive Science, Optics, Micro Electro-­Mechanical System, and Information Technology (ICACOMIT), Jakarta, 2017, pp. 133-137. doi: 10.1109/ICACOMIT.2017.8253401

      [18] Y. Hato, “ Micro-Bubble Generator And Micro-Bubble Generation Device,” United States Patent, Patent No.: US 2012/0126436 A1, Date of Patent: May 24, 2012.

      [19] T. Ziegenhein, M. Garcon, and D. Lucas, “Particle tracking using microbubbles in bubbly flows,” Chem. Eng. Sci., vol. 153, pp. 155–164, 2016.


 

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Article ID: 24077
 
DOI: 10.14419/ijet.v7i4.40.24077




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