Mass transfer from single carbon dioxide bubbles in contaminated water in a vertical pipe

被引:32
作者
Aoki, Jiro [1 ]
Hayashi, Kosuke [1 ]
Tomiyama, Akio [1 ]
机构
[1] Kobe Univ, Grad Sch Engn, Nada Ku, Kobe, Hyogo 6578501, Japan
关键词
Bubble; Mass transfer; Carbon dioxide (CO2); Surfactant; SOLUBLE SURFACTANTS; TAYLOR BUBBLE; DIFFUSION; INTERFACE; VELOCITY; FLOW;
D O I
10.1016/j.ijheatmasstransfer.2014.12.062
中图分类号
O414.1 [热力学];
学科分类号
摘要
Mass transfer from single carbon dioxide bubbles rising through contaminated water in a vertical pipe of 12.5 mm diameter was measured to investigate effects of surfactant. The bubble diameter was widely varied to cover various bubble shapes such as spheroidal, wobbling, cap and Taylor bubbles. The gas and liquid phases were 99.9% purity carbon dioxide and a surfactant solution made of purified water and Triton X-100. Comparison of mass transfer rates between contaminated and clean bubbles made clear that the surfactant decreases the mass transfer rates of small bubbles. The Sherwood numbers of small bubbles in the extreme cases, i.e. zero and the highest surfactant concentrations, are well correlated in terms of the bubble Reynolds number, Schmidt number and the ratio, 2, of the bubble diameter to pipe diameter. The Sherwood numbers at intermediate surfactant concentrations, however, are not well correlated using available correlations. The mass transfer rates of Taylor bubbles also decrease with increasing the surfactant concentration. They however increase with the diameter ratio and approach those of clean Taylor bubbles as 2 increases. The main cause of this tendency was revealed by interface tracking simulations, i.e. the surfactant adsorbs only in the bubble tail region and the nose-to-side region is almost clean at high A. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:652 / 658
页数:7
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