Based on the planar laser-induced fluorescence with inhibition (PLIF-I) experiments, the mass transfer and diffusion phenomena in the wake of single air bubbles (equivalent diameter ∼ 1–1.4 mm) rising in various aqueous polymer solutions (PAAm: 0.1–0.5 wt %; Breox: 2–9.1 wt %) are investigated. For each fluid medium, liquid-side mass transfer coefficient and the diffusion coefficient were determined and analyzed by considering multiple factors: the rheological properties of the fluid, the concentration of the solute, the hydrodynamics of the bubble, and the contamination effect. The results were compared with cases implemented in nonpolymer solutions to clearly identify the characteristics of mass transfer in the polymer media. In addition, a new method is proposed to determine the diffusion coefficient in the bubble wake. The present research proves that PLIF-I is a promising tool for investigating local gas–liquid mass transfer, even in complex liquid media.

中文翻译：

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聚合物溶液中单个气泡上升的传质与扩散

根据平面激光诱导的抑制荧光实验（PLIF-I），在各种聚合物水溶液中（PAAm：0.1- 0.5％（重量）； Breox：2-9.1％（重量）。对于每种流体介质，通过考虑多种因素来确定和分析液体侧的传质系数和扩散系数：流体的流变性，溶质的浓度，气泡的流体动力学和污染效应。将结果与在非聚合物溶液中实施的情况进行比较，以明确确定聚合物介质中传质的特征。另外，提出了一种确定气泡尾流中扩散系数的新方法。