Fluid Dynamics in a Continuous Pump-Mixer
Fluid Dynamics in a Continuous Pump-Mixer
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DOI：
10.3390/app12168195
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
D. Wirz;Simon Gründken;A. Friebel;Kevin Rave;Mario Hermes;R. Skoda;E. von Harbou;H. Bart
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文献类型：
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作者：
D. Wirz;Simon Gründken;A. Friebel;Kevin Rave;Mario Hermes;R. Skoda;E. von Harbou;H. Bart
使用水作为连续相、石蜡油作为分散相，研究了连续 DN300 泵混合器的流体动力学（流速）和流体动力学行为（局部液滴尺寸分布和局部滞留量）。通过测量泵送高度、分散相的局部滞留量和液滴尺寸分布 (DSD)，研究了叶轮速度（N = 375 至 425 rpm）、进料相比（φF = 10 至 30 vol.-%）和流量（V˙tot ≈ 0.5 至 2.3 L/min）的影响。后者是使用基于图像的远心阴影技术在三个不同的血管位置进行测量的。使用神经网络从获取的图像中提取液滴直径。 Sauter 平均直径是根据 DSD 计算出来的，并与基于 Doulah (1975) 的扩展模型相关，考虑了叶轮速度、进料相比以及流速。新的相关性可以描述一个广泛的数据库，其中包含 155 个流体和流体动力学实验，误差范围在 15% 以内。
The fluid dynamic (flow rates) and hydrodynamic behavior (local droplet size distributions and local holdup) of a continuous DN300 pump-mixer were investigated using water as the continuous phase and paraffin oil as the dispersed phase. The influence of the impeller speed (N = 375 to 425 rpm), the feed phase ratio (φF = 10 to 30 vol.-%), and the flow rate (V˙tot ≈ 0.5 to 2.3 L/min) were investigated by measuring the pumping height, local holdup of the disperse phase, and the droplet size distribution (DSD). The latter one was measured at three different vessel positions using an image-based telecentric shadowgraphic technique. The droplet diameters were extracted from the acquired images using a neural network. The Sauter mean diameters were calculated from the DSD and correlated with an extended model based on Doulah (1975), considering the impeller speed, the feed phase ratio, and additionally the flow rate. The new correlation can describe an extensive database containing 155 experiments of the fluid and hydrodynamic within a 15% error range.