Abstract The paper presents a study on the mass transfer of Taylor bubbles flowing in non-Newtonian fluids (slug flow) using an oxygen-sensitive colorimetric method, for the bubble formation and flow stages. The effects of fluid rheology on the operation range, bubble length and bubble shape are first presented, showing that they can be well described by the effective viscosity. The concentration distribution and kLa are also altered by the fluid rheology. Such effect highly depends on the flow rates, leading to distinct phenomena under small and high flow rates. Nevertheless, for all the fluid systems the mass transfer can be described by three parts, the transfer through the caps, through the lateral film and the film-slug exchange. A mass transfer model is proposed accordingly, which shows a larger contribution of the film (20%-60%) in shear-thinning fluids than that in the Newtonian fluid (10%-25%).

中文翻译：

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泰勒气泡在微通道中的非牛顿流体中流动的流体动力学和传质

摘要 本文针对气泡形成和流动阶段，使用氧敏感比色法研究了在非牛顿流体（段塞流）中流动的泰勒气泡的传质。首先介绍了流体流变对操作范围、气泡长度和气泡形状的影响，表明它们可以用有效粘度很好地描述。流体流变学也改变了浓度分布和 kLa。这种效果高度依赖于流速，导致在小流速和高流速下出现不同的现象。然而，对于所有流体系统，质量传递可以通过三个部分来描述，通过帽、通过横向薄膜和薄膜段塞交换。相应地提出了传质模型，