Contact
    Start Publications Effect of shunting ratio on the size of bubbles generated from ...
    ←  Publication Finder
    Attension

    Effect of shunting ratio on the size of bubbles generated from a submerged orifice under oscillatory air supply

    Year: 2022

    Journal: Chem. Eng. Res. Des., Volume 188, DEC, page 877–885

    Authors: Zhao, Sijia; Song, Ajuan; Cao, Yijun; Yang, Siyuan; Li, Chao

    Organizations: National Natural Science Foundation of China; ChinaPostdoctoral Science Foundation; Key Research and Development and Promotion Program in Henan Province; National Key Research and Development Program; [52004248]; [2019M652580]; [2021T140617]; [212102310011]; [2020YFC1908800]

    Keywords: Bubble generation; Shunting ratio; Static pressure; Bubble detachment; Bubble coalescence

    The diameter of bubbles generated from submerged orifices is closely related to the air pressure, which consists of static and dynamic pressures. It has been proven that switching the air supply from a steady to oscillatory flow can improve the dynamic pressure and thus lead to smaller bubbles. To complement the control strategy for bubble size optimization, this study proposes an approach to enhance static pressure by introducing a Y-junction shunting configuration under an oscillatory air supply. A model of gas pressure as a function of the shunting ratio was developed and validated experimentally. A positive correlation was observed between the shunting ratio and static pressure. The bubble size first decreased and then increased as the shunting ratio increased from 0 to 3.0. The smallest bubbles were obtained at a shunting ratio of 1.5 with a diameter reduction of 26% compared with no shunting. By segregating the bubble formation process, the bubble diameter at detachment continuously decreases over the shunting ratio. However, the number of coalesced bubbles first decreased and then increased, and the underlying mechanism is discussed. The findings indicated that the shunting air supply could facilitate bubble size optimization when the shunting ratio was appropriately controlled. (c) 2022 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.
    View publication