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不同壁面取向下超疏水平面直轨道上的气泡滑移

叶煜航 凃程旭 包福兵 汪钰锟 杨森森

叶煜航, 凃程旭, 包福兵, 汪钰锟, 杨森森. 不同壁面取向下超疏水平面直轨道上的气泡滑移[J]. 力学学报, 2021, 53(4): 962-972. doi: 10.6052/0459-1879-20-405
引用本文: 叶煜航, 凃程旭, 包福兵, 汪钰锟, 杨森森. 不同壁面取向下超疏水平面直轨道上的气泡滑移[J]. 力学学报, 2021, 53(4): 962-972. doi: 10.6052/0459-1879-20-405
Ye Yuhang, Tu Chengxu, Bao Fubing, Wang Yukun, Yang Sensen. BUBBLE SLIPPING ON A SUPERHYDROPHOBIC PLANAR STRAIGHT TRAJECTORY UNDER DIFFERENT SURFACE ORIENTATIONS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(4): 962-972. doi: 10.6052/0459-1879-20-405
Citation: Ye Yuhang, Tu Chengxu, Bao Fubing, Wang Yukun, Yang Sensen. BUBBLE SLIPPING ON A SUPERHYDROPHOBIC PLANAR STRAIGHT TRAJECTORY UNDER DIFFERENT SURFACE ORIENTATIONS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(4): 962-972. doi: 10.6052/0459-1879-20-405

不同壁面取向下超疏水平面直轨道上的气泡滑移

doi: 10.6052/0459-1879-20-405
基金项目: 1)国家重点研发(2017YFB0603701);国家自然科学基金(11972334);国家自然科学基金(11672284)
详细信息
    作者简介:

    2)凃程旭,副教授,主要研究方向:多相流. E-mail: tuchengxu@cjlu.edu.cn

    通讯作者:

    凃程旭

  • 中图分类号: O359

BUBBLE SLIPPING ON A SUPERHYDROPHOBIC PLANAR STRAIGHT TRAJECTORY UNDER DIFFERENT SURFACE ORIENTATIONS

  • 摘要: 利用特定几何分布的超疏水表面实现气泡定向输运在矿物浮选和生物孵化等领域具有广阔的应用前景, 对平面直线超疏水轨道而言, 其壁面取向是相关工程结构的关键参数, 但超疏水壁面取向对倾斜壁面气泡滑移的影响尚不明确. 本文采用高速阴影成像系统研究了不同壁面取向($-90^\circ\leqslant \beta \leqslant 90^\circ$)及轨道倾角($45^\circ\leqslant \alpha \leqslant 75^\circ$)下, 气泡($D_{eq}=2.4$ mm, $Re=500$ $\sim$ 700, $We=7$ $\sim$ 13)在轨道宽度为2 mm的超疏水直线轨道上的运动特性. 气泡在轨道上的滑移近似为匀速, 形状为具有多脊的半子弹型. 根据气液界面波动程度的不同, 滑移气泡可分为波动型和稳定型, 稳定型气泡只在较小倾角且较大方位角时出现($45^\circ\leqslant \alpha < 70^\circ$, $| \beta | \geqslant 45^\circ$). 根据倾角不同, 滑移速度关于$\beta $有2种变化规律: 当$\alpha \leqslant 65^\circ$, 气泡滑移速度近似为关于$\beta =0^\circ$ 的单峰分布($\beta =0^\circ$时, 气泡滑移速度最大); 当$\alpha \geqslant 70^\circ$, 气泡滑移速度在不同的方位角下基本保持稳定. 气泡的最大滑移速度可达0.66 m/s ($\beta =0^\circ$, $\alpha =70^\circ$), 远大于相同尺度的自由上升气泡($\approx0.25$ m/s), 这主要是壁面浸润性分布和惯性力的耦合效应所致. 轨道取向(方位角$\beta )$及轨道倾角($\alpha )$通过改变气泡沿轨道方向的驱动力和气泡迎风面积影响气泡的滑移速度和气液界面稳定性.

     

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  • 收稿日期:  2020-12-01

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