Abstract The intrusive image-based method is used to probe local gas hydrodynamics, bubble size (BSD) and holdup distributions (BHD) in a gas-liquid stirred tank reactor (STR). A distinctive scheme combining automatic and manual processes is implemented to identify the object bubbles in the images. This method shows more accurate for judging the flow regime in gas-liquid STRs. Because of high intensity turbulence therein, the instantaneous local gas-liquid flow may present several very different patterns though the time-averaged bulk flow is homogeneous. More small bubbles are detected because of high resolution of the instrument, and consequently d32 obtained is smaller than those by other methods. The BSD and BHD at moderate gassing rates are reported and found closer to the physical reality. The measurements are of significance to understanding the fluid mechanics and provide benchmark data for the validation of the mathematical models in the gas-liquid STRs operating at industrial conditions.

中文翻译：

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气液搅拌罐中典型工业产气速率下气相流体动力学的侵入式图像方法

摘要 使用基于侵入式图像的方法来探测气液搅拌釜反应器 (STR) 中的局部气体流体动力学、气泡大小 (BSD) 和滞留分布 (BHD)。实施了一种结合自动和手动过程的独特方案来识别图像中的对象气泡。该方法在判断气液STRs中的流态方面表现出更准确的结果。由于其中的高强度湍流，瞬时局部气液流动可能呈现几种非常不同的模式，尽管时均整体流动是均质的。由于仪器分辨率高，检测到的小气泡较多，因此得到的d32比其他方法小。中等放气率下的 BSD 和 BHD 被报告并发现更接近物理现实。