loading page

Continuous formation of microbubbles during partial coalescence of bubbles from a submerged capillary nozzle
  • +2
  • Jiguo Tang,
  • Shengzhi Yu,
  • Licheng Sun,
  • Guo Xie,
  • Xiao Li
Jiguo Tang
Sichuan University

Corresponding Author:[email protected]

Author Profile
Shengzhi Yu
Wuhan Second Ship Design and Research Institute
Author Profile
Licheng Sun
Sichuan University
Author Profile
Guo Xie
Sichuan University
Author Profile
Xiao Li
Sichuan University
Author Profile


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.
22 Jan 2020Submitted to AIChE Journal
24 Jan 2020Submission Checks Completed
24 Jan 2020Assigned to Editor
27 Jan 2020Reviewer(s) Assigned
04 Mar 2020Editorial Decision: Revise Minor
20 Mar 20201st Revision Received
25 Mar 2020Submission Checks Completed
25 Mar 2020Assigned to Editor
26 Mar 2020Reviewer(s) Assigned
27 Mar 2020Editorial Decision: Accept