Dynamics of non-Newtonian droplet breakup with partial obstruction in microfluidic Y-junction. (31st August 2021)

• Record Type: Journal Article
• Authors: Ma, You; Zhu, Chunying; Fu, Taotao; Ma, Youguang; Li, Huai Z.
• Is Part Of: Chemical engineering science. Volume 240(2021)
• Publication Date: 2021-08-31
• Subjects: Microfluidics -- Y- junction -- Non-Newtonian fluid -- Droplet -- Breakup; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2021.116696
• Languages: English
• ISSNs: 0009-2509

Abstract

Highlights: Breakup of non-Newtonian droplet in microfluidic Y-junction was investigated. Three breakup stages were observed. Variation of the width of the neck during droplet breakup was studied. Effect of rheological property on droplet breakup dynamics was studied. Abstract: Dynamics of non-Newtonian droplet (CMC aqueous solution) breakup with partial obstruction in microfluidic Y-junction was visually investigated. Three breakup stages were found: squeezing, transition and pinch-off. The effects of the concentration c of CMC, continuous capillary number Ca c and dispersed phase local capillary number Ca d on droplet breakup were studied. In squeezing stage and transition stage, the breakup process could be promoted by increasing Ca d or decreasing c . The pinch-off stage relied primarily on the surface tension and was almost independent of inertial force and viscous force. For the shear thinning non-Newtonian droplet, the length of the daughter droplet was always linearly stretched with time until breakup and the maximum gap width increased with Ca c, but decreased with the increases of c and Ca d .