Abstract Mass transfer from single carbon-dioxide (CO2) bubbles rising through vertical pipes filled with surfactant−electrolyte mixed aqueous solutions was measured to study the combined effects of surfactant and electrolyte on the mass transfer. Triton X-100 and sodium chloride (NaCl) were used for surfactant and electrolyte, respectively. The surface tension, σeq, at an equilibrium state decreased with increasing the concentration of NaCl at a constant concentration of Triton X-100. The pipe diameters were 12.5 and 18.2 mm. A wide range of bubble diameter covered various bubble shapes from ellipsoidal to Taylor bubbles. The combined effects of Triton X-100 and NaCl on the Sherwood number, Sh, showed a different trend from those of alcohol and electrolyte, i.e. bubbles in the Triton X-100−NaCl mixed aqueous solution were not fully-contaminated even with the same σeq as in the condition fully-contaminated with Triton X-100, due to the difference in distributions of surfactant concentrations at the interface. The Sh of bubbles fully-contaminated with Triton X-100 were not affected by the presence of NaCl. The Sh of contaminated Taylor bubbles can be expressed as a combination of functional forms of available Sh correlations for clean and fully-contaminated Taylor bubbles.

中文翻译：

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垂直管道中表面活性剂-电解质混合水溶液中单个二氧化碳气泡的传质

摘要 测量了单个二氧化碳 (CO2) 气泡通过充满表面活性剂-电解质混合水溶液的垂直管道上升的传质，以研究表面活性剂和电解质对传质的综合影响。Triton X-100 和氯化钠 (NaCl) 分别用于表面活性剂和电解质。在 Triton X-100 的恒定浓度下，平衡状态下的表面张力 σeq 随 NaCl 浓度的增加而降低。管道直径为 12.5 和 18.2 毫米。广泛的气泡直径涵盖了从椭圆形到泰勒气泡的各种气泡形状。Triton X-100 和 NaCl 对 Sherwood 数 Sh 的综合影响显示出与酒精和电解质不同的趋势，即 由于界面处表面活性剂浓度分布的差异，即使与 Triton X-100 完全污染的条件相同，Triton X-100-NaCl 混合水溶液中的气泡也没有完全污染。被 Triton X-100 完全污染的气泡的 Sh 不受 NaCl 的影响。受污染的泰勒气泡的 Sh 可以表示为清洁和完全污染的泰勒气泡的可用 Sh 相关性的函数形式的组合。