Journal
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
Volume 97, Issue -, Pages 38-44Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cep.2015.08.008
Keywords
Bubble; Coalescence; Microfluidics; Non-Newtonian fluid; Micro-PIV
Categories
Funding
- National Natural Science Foundation of China [21106093, 21276175, 91434204]
- Program of Introducing Talents of Discipline [B06006]
- China Scholarship Council
- French Embassy in China
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This communication presents experimentally the bubble coalescence in a microfluidic expansion device using a high-speed digital camera and a micro-particle image velocimetry (micro-Ply) system. Experiments were conducted in a PMMA microchannel of 400 mu m deep, composed of an expansion with an angle of 60 degrees. N-2 bubbles were generated in 0.5 wt% polyacrylamide (PAAm) non-Newtonian fluids by hydrodynamic flow-focusing method and flowed past the expansion section. Two different mechanisms for bubble coalescence were observed by changing the gas and liquid flow rates. Three various processes of bubble coalescence were presented and analyzed. The probability, time and position for bubble coalescence were also calculated. The velocity fields in the liquid phase around the aligned bubbles were determined by micro-Ply measurements to gain insight into the mechanism for bubble coalescence. (C) 2015 Elsevier B.V. All rights reserved.
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