1. 毕业设计（论文）的内容和要求

气液反应是过程工业中的重要反应类型。气液传质过程在气泡表面进行，气泡的大小及其行为将直接影响气液传质过程，甚至关系到相关反应器及系统的运行安全性。利用孔道向液相中通入气体，是常见的气泡的生成方法之一，因而孔口鼓泡行为值得深入研究。与毫米级的气泡相比，微气泡具有上升速度慢、比表面积大、自身增压溶解、气体溶解率高等特性，可以有效地强化气液传质，目前已在化工、环境、农业以及医药等行业有所应用。关于如何高效、低能耗且易操作的可控生产大量均一的微气泡是研究的热点。膜分散技术是具有潜力的一种气泡制备技术，利用膜的微纳米级多孔结构可制备大量微气泡，对气-液-固多相催化反应有很好的强化作用，能够显著促进气液传质过程，从而提高反应的转化率/选择性。但是，微米尺度气体逸出孔对气泡的形成行为及特征的相关研究较少。

本课题采用可视化原位观测的方法研究单孔逸出气泡的行为特征，考察孔径的变化对气泡行为特征的影响，对比微米级孔口逸出气泡的行为特征与毫米级孔口的差异，并采用化学吸收法定量表征微气泡传质性能。

2. 参考文献

[1] Liao Q, Zhu X, Wang H, et al. Visual experiments of bubble growth and departure at the tip of inclined capillary tubes in a stagnant liquid[J]. Journal of Superconductivity amp; Novel Magnetism, 2010, 23: 1147-1150.
[2] Vafaei S, Wen D. Bubble formation on a submerged micronozzle[J]. Journal of Colloid amp; Interface Science, 2010, 343: 291-297.
[3] Xie J, Zhu X, Liao Q, et al. Dynamics of bubble formation and detachment from an immersed micro-orifice on a plate[J]. International Journal of Heat amp; Mass Transfer, 2012, 55: 3205-3213.
[4] Chen Y, Liu S, Kulenovic R, et al. Experimental study on macroscopic contact line behaviors during bubble formation on submerged orifice and comparison with numerical simulations[J]. Physics of Fluids, 2013, 25: 092105.
[5] Zhu X, Xie J, Liao Q, et al. Dynamic bubbling behaviors on a micro-orifice submerged in stagnant liquid[J]. International Journal of Heat and Mass Transfer, 2014, 68: 324-331.
[6] Vafaei S, Borca-Tasciuc T, Wen D. Investigation of nanofluid bubble characteristics under non-equilibrium conditions[J]. Chemical Engineering and Processing: Process Intensification, 2014, 86: 116-124.
[7] Dzienis P, Mosdorf R. Stability of periodic bubble departures at a low frequency[J]. Chemical Engineering Science, 2014, 109: 171-182.
[8] Pei H S, Guo C L, Zhang G F, et al. Dynamic behavior of bubble forming at capillary orifice in methane oxidizing bacteria suspension[J]. International Journal of Heat and Mass Transfer, 2017, 110: 873-879.
[9] Qu C, Yu Y, Zhang J. Experimental study of bubbling regimes on submerged micro-orifices[J]. International Journal of Heat and Mass Transfer, 2017, 111: 17-28.

3. 毕业设计（论文）进程安排

2019.1.4～2019.3.10 查阅文献，翻译英文文章，撰写开题报告；

2019.3.11～2019.3.20 熟悉实验流程；

2019.3.21～2019.5.20 实验研究，总结规律，处理实验数据；