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Experimental and Numerical Study on Flow Resistance and Bubble Transport in a Helical Static Mixer

Author

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  • Fangyang Yuan

    (Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China
    School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China)

  • Zhengwei Cui

    (Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China)

  • Jianzhong Lin

    (School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China)

Abstract

Flow resistance and bubble transport in a helical static mixer were studied experimentally and numerically. The inline mixer increases the volume fraction of gas in liquids by breaking bubbles into smaller sizes with a micrometer size in the flow experiments. The gas–liquid flow was simulated by a combination of computational fluid dynamics and Taylor expansion methods of moments. The friction factor of the helical static mixer is much smaller than that of the Kenics static mixers. The pressure drop increases with the Reynolds number, and the increment is larger when the Reynolds number is higher. The equidistant pressure drop increases with the argument of Reynolds number, and increases when the pitch decreases from upstream to downstream. The energy expenditure increases significantly when the variable-pitch coefficient is too small. The bubble geometric mean diameter decreases and the geometric standard deviation increases when the gas–liquid fluid flows through the mixer. The variable pitch structure enhances the bubble breakup effectively. The change of the bubble size decreases with the argument of the Reynolds number. The effect of the mixer has a limitation on breaking the bubbles.

Suggested Citation

  • Fangyang Yuan & Zhengwei Cui & Jianzhong Lin, 2020. "Experimental and Numerical Study on Flow Resistance and Bubble Transport in a Helical Static Mixer," Energies, MDPI, vol. 13(5), pages 1-20, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1228-:d:329492
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    References listed on IDEAS

    as
    1. Tenglong Cong & Xiang Zhang, 2018. "Numerical Study of Bubble Coalescence and Breakup in the Reactor Fuel Channel with a Vaned Grid," Energies, MDPI, vol. 11(1), pages 1-16, January.
    2. Jesús Cerezo & Roberto Best & Jorge Jesús Chan & Rosenberg J. Romero & Jorge I. Hernandez & Fernando Lara, 2017. "A Theoretical-Experimental Comparison of an Improved Ammonia-Water Bubble Absorber by Means of a Helical Static Mixer," Energies, MDPI, vol. 11(1), pages 1-14, December.
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    Cited by:

    1. Guodong Li & Dandan Cai & Shanshan Li & Xiaogang Li & Pengfeng Li & Juanli Zuo, 2020. "The Influence of Groove Structure Parameters on the Maximum Flow Resistance of a Rectangular Narrow Channel," Energies, MDPI, vol. 13(14), pages 1-15, July.

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