This work is an experimental investigation of the effect of the nature of surfactants on oxygen mass transfer. The study focuses on three cationic surfactants with different hydrophobic chain lengths, and four nonionic surfactants with different hydrophilic chain lengths. Equilibrium adsorption isotherms are calculated for each surfactant from experimental values of surface tension in static conditions. Surfactant solutions at concentrations between 2.5 × 10^-8 and 5 × 10^-3 mol/L were prepared and oxygen transfer from millimetric air bubbles (between 0.82 and 1.08 mm) was measured by Planar Laser Induced Fluorescence with Inhibition (PLIF-I). When the bulk concentration of surfactant was increased, results showed a sharp decrease of bubble velocity, in the range of 283–75 mm/s, and of liquid-side mass transfer coefficient, in the range of 5.6 × 10^-4–0.4 × 10^-4 m/s. This effect was observed for all surfactants studied. However, the length of the hydrophilic chain did not appear to affect the hydrodynamics of the rising bubble or the oxygen transfer at the same bulk concentration. Furthermore, for the same bulk concentration, increasing the hydrophobic chain length had an impact on the velocity and the mass transfer coefficient of oxygen. Finally, the Sherwood number was calculated in each medium and compared with classical correlations for gas–liquid mass transfer prediction. Those correlations seemed to reach a limit for a very concentrated medium.

这项工作是对表面活性剂性质对氧传质影响的实验研究。该研究侧重于具有不同疏水链长度的三种阳离子表面活性剂和具有不同亲水链长度的四种非离子表面活性剂。从静态条件下的表面张力实验值计算每种表面活性剂的平衡吸附等温线。浓度介于 2.5 × 10 ^-8和 5 × 10 ^-3之间的表面活性剂溶液制备 mol/L，并通过平面激光诱导荧光抑制 (PLIF-I) 测量来自毫米级气泡（0.82 和 1.08 毫米之间）的氧气转移。当表面活性剂的体积浓度增加时，结果显示气泡速度急剧下降，在 283-75 mm/s 范围内，液体侧传质系数在 5.6 × 10 ^-4 –0.4 ×范围内10 ^-4多发性硬化症。对于所有研究的表面活性剂都观察到了这种效果。然而，亲水链的长度似乎不会影响上升气泡的流体动力学或相同体积浓度下的氧转移。此外，对于相同的体积浓度，增加疏水链长度对氧气的速度和传质系数有影响。最后，计算每种介质中的舍伍德数，并与气液传质预测的经典相关性进行比较。对于非常集中的介质，这些相关性似乎达到了极限。