Skip to Main content Skip to Navigation
New interface
Journal articles

Bubble coalescence in non-Newtonian fluids in a microfluidic expansion device

Abstract : 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.
Document type :
Journal articles
Complete list of metadata
Contributor : LRGP UL Connect in order to contact the contributor
Submitted on : Friday, February 12, 2016 - 1:01:49 PM
Last modification on : Friday, March 4, 2022 - 2:33:30 PM



Taotao Fu, Youguang Ma, Huai Z. Li. Bubble coalescence in non-Newtonian fluids in a microfluidic expansion device. Chemical Engineering and Processing: Process Intensification, 2015, 97 (SI), pp.38-44. ⟨10.1016/j.cep.2015.08.008⟩. ⟨hal-01273378⟩



Record views