Effects of Surfactants on Mass Transfer from Single Carbon Dioxide Bubbles in Vertical Pipes. Issue 11 (28th August 2015)

• Record Type: Journal Article
• Authors: Aoki, Jiro; Hayashi, Kosuke; Hosokawa, Shigeo; Tomiyama, Akio
• Is Part Of: Chemical engineering & technology. Volume 38:Issue 11(2015:Nov.)
• Page Start: 1955
• Page End: 1964
• Publication Date: 2015-08-28
• Subjects: Mass transfer -- Sherwood number -- Surfactant -- Taylor bubble -- Wall effect; Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.201500063
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: Mass transfer from single fully contaminated carbon dioxide bubbles rising through vertical pipes was measured to investigate the effects of surfactants. The diameter ratio 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 served as surfactants. 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 varying 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. Abstract : To investigate the effects of surfactants, mass transfer rates, k L, of single CO2 bubbles rising through contaminated water in vertical pipes are measured. The Hatta number plays a key role in interfacial distribution of surfactant, on which k L strongly depends. A k L correlation applicable to fully contaminated ellipsoidal and Taylor bubbles is proposed.