Ardestani Fatemeh, Ghaemi Ahad, Safdari Jaber, Hemmati Alireza
School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology P.O. Box: 16765-163 Tehran Iran
Materials and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute Tehran Iran.
RSC Adv. 2022 Feb 2;12(7):4120-4134. doi: 10.1039/d1ra08723a. eCollection 2022 Jan 28.
In this study, the effect of operating parameters on drop behavior was investigated experimentally in an L-shaped pulsed sieve-plate column (LPSPC). LPSPC offers enhanced efficiency due to a high mixing rate provided by pneumatic or hydraulic pulsation of the liquids, which makes the dispersed phase drops coalesce and break. The response surface methodology (RSM) based on the central composite design (CCD) approach was applied for experimental modeling of three standard systems including toluene-water, butyl acetate-water, and butanol-water. Four parameters including pulsation intensity, interfacial tension, dispersion, and continuous phase velocities were examined in the experiments. Experimental results indicated that an increase in the pulsation intensity led to a decrease in Sauter mean diameter (SMD), and an increase in the flow rates of the phase cause an increase in SMD, although the effect of the flow rates on SMD was much lower than the pulsation intensity. Based on the obtained experimental data, new correlations have been proposed to predict SMD in two sections of the column tested by the goodness-of-fit statistics through analysis of variance. The coefficient of determination was achieved at 0.998 and 0.978 for horizontal and vertical sections, respectively, which demonstrated that the presented models estimated the experimental values very well. The optimum SMDs were obtained at 0.789 mm and 0.639 mm for the horizontal and vertical sections, respectively.
在本研究中，在L形脉冲筛板塔（LPSPC）中对操作参数对液滴行为的影响进行了实验研究。由于液体的气动或液压脉动提供了高混合速率，LPSPC具有更高的效率，这使得分散相液滴聚结和破裂。基于中心复合设计（CCD）方法的响应面方法（RSM）被应用于包括甲苯-水、乙酸丁酯-水和丁醇-水在内的三个标准体系的实验建模。实验中考察了脉动强度、界面张力、分散相和连续相流速四个参数。实验结果表明，脉动强度的增加导致索特平均直径（SMD）减小，相流速的增加导致SMD增大，尽管流速对SMD的影响远低于脉动强度。基于获得的实验数据，通过方差分析，利用拟合优度统计方法提出了新的关联式来预测柱体两个测试段的SMD。水平段和垂直段的决定系数分别达到0.998和0.978，这表明所提出的模型对实验值的估计非常好。水平段和垂直段的最佳SMD分别为0.789mm和0.639mm。
