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Experimental study on the radial distribution of the main transition velocities in bubble columns

机译：鼓泡塔主过渡速度径向分布的实验研究

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The effect of the radial position on the main transition velocities in bubble columns has not been reported in the literature hitherto. In this paper, the information entropies IE were extracted in a new way from local gas holdup fluctuations measured by a wire-mesh sensor at different radial positions in both small (0.15 m in ID) and large (0.4 m in ID) bubble columns. On the basis of well-defined local minima in the IE profiles, the transition velocities U_(trans), at the different radial positions were identified successfully. It was found that in the small column the first transition velocity U_(trans), 1 (corresponding to the end of the gas maldistribution regime) was somewhat lower in the center of the column as compared to the wall. In the large column, the U_(trans), value in the center was somewhat higher than the one at the wall. The second transition velocity U_(trans),2 (corresponding to the onset of the churn-turbulent regime) in the small column was slightly higher at the core of the column. In the large column, the U_(trans),2 value was changing constantly from U_g=0.089 m/s to 0.101 m/s and vice versa. The IE results showed that only at the fifth radial position in the small column and at the third and fourth radial positions in the large column there was a division of the transition regime into first and second transition sub-regimes.
机译：迄今为止，在气泡柱中径向位置对主要过渡速度的影响尚未见报道。在本文中，信息熵IE以一种新的方式从小气泡（内径0.15 m）和大气泡（内径0.4 m）的不同径向位置处的丝网传感器测量的局部气体滞留波动中提取。根据IE轮廓中定义明确的局部最小值，成功确定了不同径向位置处的过渡速度U_（trans）。发现在小塔中，第一过渡速度U_（trans）1（对应于气体分布不均的末端）在壁的中心比壁稍低。在大列中，中心的U_（trans）值比墙中的U_（trans）值高一些。小圆柱中的第二过渡速度U_（trans），2（对应于搅动湍流状态的开始）在圆柱中部稍高。在大列中，U_（trans），2值从U_g = 0.089 m / s不断变化到0.101 m / s，反之亦然。 IE结果表明，仅在小列中的第五个径向位置以及大列中的第三个和第四个径向位置，才将过渡制度分为第一和第二过渡子制度。

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