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Coalescence Characteristics of Side‐by‐Side Growing Bubbles in Carboxymethyl Cellulose Solutions
Chemical Engineering & Technology ( IF 2.418 ) Pub Date : 2019-11-14 , DOI: 10.1002/ceat.201900332
Wenyuan Fan; Mengqi Du; Yawei Sun; Hui Chen

New experimental data are presented on the coalescence dynamics of twin bubbles at two adjacent nozzles in carboxymethyl cellulose (CMC) solutions. The coalescence process was recorded by using a fast video technique and the images were then analyzed to evaluate the regime, efficiency, and patterns of bubble coalescence. The results reveal that the coalescence process contains the four periods of spherical expansion, rapid mergence, overall growth, and instant departure. The coalescence efficiency always passes through five stages with the gas flow rate; it grows with the CMC solution concentration, but decreases with the surfactant concentration, except at very low gas flow rates. The bubble coalescence pattern strongly depends on the nozzle spacing, but conditionally on the gas flow rate and the solution properties.
更新日期:2020-01-21

 

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