Continuous formation of microbubbles during partial coalescence of bubbles from a submerged capillary nozzle
Continuous formation of microbubbles during partial coalescence of bubbles from a submerged capillary nozzle
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来自浸入式毛细管喷嘴的气泡部分聚结过程中连续形成微泡
DOI：
10.22541/au.158015164.40464949
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发表时间：
2020-01
期刊：
影响因子：
3.7
通讯作者：
Xiao Li
中科院分区：
文献类型：
--
作者：
Jiguo Tang;Shengzhi Yu;Licheng Sun;Guo Xie;Xiao Li
Bubble formation from a downward-pointing capillary nozzle was investigated in this study. The experiments were conducted at gas flow rate of 40-5400 mL/h and inner nozzle radius of 0.030-0.255 mm. Experimental results show that microbubbles were formed continuously at moderate Weber number, which was not reported in pervious investigations with injecting gas through an upward-pointing capillary nozzle. High-speed visualization indicates that the formation of microbubbles arises from the convergence of the capillary waves induced by the partial coalescence of larger bubbles. A bubbling regime map is given to identify the critical conditions for the formation of microbubbles. In the present air-water experiments, the generated microbubbles are 20-170 μm in diameter. From experimental data, a scaling law for microbubble size is proposed as a function of Weber and Bond numbers.
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