Hydrodynamics of gas phase under typical industrial gassing rates in a gas-liquid stirred tank using intrusive image-based method
Hydrodynamics of gas phase under typical industrial gassing rates in a gas-liquid stirred tank using intrusive image-based method
复制标题
DOI：
10.1016/j.ces.2020.115923
复制
发表时间：
2020-12
影响因子：
4.7
通讯作者：
Yiting Xiao;Xiangyang Li;Shilong Ren;Z. Mao;Chao Yang
中科院分区：
文献类型：
--
作者：
Yiting Xiao;Xiangyang Li;Shilong Ren;Z. Mao;Chao Yang
采用基于图像的侵入式方法研究了气液搅拌釜式反应器（STR）中的局部气体流动特性、气泡尺寸（BSD）和含率分布（BHD）。一个独特的方案相结合的自动和手动过程中实现的识别图像中的对象气泡。该方法对判断气液STR中的流型具有较高的准确性。由于其中的高强度湍流，虽然时间平均的整体流是均匀的，但是瞬时局部气液流可以呈现几种非常不同的模式。由于仪器的高分辨率，可以检测到更多的小气泡，因此获得的d32比其他方法更小。在中等放气率的BSD和BHD的报告，发现更接近物理现实。这些测量结果对理解流体力学具有重要意义，并为工业条件下气液STR数学模型的验证提供了基准数据。
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 consequentlyd32obtained 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.