Publication Date:
2015-06-20
Description:
Mass transfer from single fully-contaminated carbon dioxide bubbles rising through vertical pipes was measured to investigate effects of surfactant. The diameter ratio, λ, of the bubble diameter to the pipe diameter was varied to cover various bubble shapes from ellipsoidal to Taylor bubbles. Triton X-100 and 1-octanol were used for the surfactant. The mass transfer rates, k L , of contaminated bubbles in the ellipsoidal regime were smaller than those of clean bubbles due to the interface immobilization. The k L of Taylor bubbles contaminated with Triton X-100 and 1-octanol showed different trends because of the difference in the surfactant distributions at the bubble interfaces, which strongly depend on the Hatta number. The Sherwood numbers of contaminated bubbles were well correlated by introducing the bubble diameter, at which the bubble shape transits from ellipsoidal to Taylor bubbles.
Print ISSN:
0930-7516
Electronic ISSN:
1521-4125
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
