循环射流混合槽内液液两相混合特性数值模拟

doi:10.16085/j.issn.1000-6613.2020-2284

化工进展 ›› 2021, Vol. 40 ›› Issue (11): 5939-5948.DOI: 10.16085/j.issn.1000-6613.2020-2284

循环射流混合槽内液液两相混合特性数值模拟

孟辉波¹^,²(), 刘振江¹^,², 禹言芳¹^,²(), 张平¹^,², 吴剑华¹^,²

^1.沈阳化工大学机械与动力工程学院，辽宁沈阳 110142
^2.沈阳化工大学辽宁省高效化工混合技术重点实验室，辽宁沈阳 110142

收稿日期:2020-11-15 修回日期:2021-03-05 出版日期:2021-11-05 发布日期:2021-11-19
通讯作者: 禹言芳
作者简介:孟辉波（1981—），男，博士，教授，研究方向为化工过程机械。E-mail：syuct_hj@163.com。
基金资助:
辽宁特聘教授计划(辽教函[2018]35号);国家自然科学基金(21476142);辽宁省教育厅项目(LQ2019003);辽宁省“百千万人才工程”项目(201892151);辽宁省自然科学基金(2019-ZD-0082);沈阳市中青年科技创新人才计划(RC200032)

Computational simulation of liquid-liquid two-phase mixing characteristics in the circulating jet tank

MENG Huibo¹^,²(), LIU Zhenjiang¹^,², YU Yanfang¹^,²(), ZHANG Ping¹^,², WU Jianhua¹^,²

^1.School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China
^2.Liaoning Key Laboratory of Chemical Technology for Efficient Mixing, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China

Received:2020-11-15 Revised:2021-03-05 Online:2021-11-05 Published:2021-11-19
Contact: YU Yanfang

摘要/Abstract

摘要：

循环射流混合槽作为一种高效的混合装置在化工过程强化处理技术中具有潜在的工业应用前景。由于缺乏对其内多相体系流动和混合行为的研究，制约了循环射流混合反应器的优化设计与工业化应用。本文选取水和二甲基硅油两相体系，采用计算流体力学软件ANSYS Fluent V16.1中Eulerian-Eulerian多相流模型和SST k-?湍流模型，对两种不同加料方式下循环射流混合槽内液液两相射流中心线速度、离析强度、拉伸率等参数进行研究。研究结果表明：分散相浓度（α_d）增大射流卷吸能耗增大，在l/s<0.4内α_d=1.80%和2.86%量纲为1的射流中心线速度衰减趋势与α_d=6.00%相比减弱51%和21%；在低分散相浓度时，量纲为1的射流中心线速度随Re的增大衰减趋势变化小，在l/s<0.24内Re=6346、9519和12692量纲为1的射流中心线速度衰减趋势与Re=3173相比分别减弱2.60%、2.87%和12.69%。离析强度随混合时间的增大而减小，随周向角度增大呈W形变化趋势。在相含率和雷诺数相同时，对称球状较圆柱状加料达到混合时间减少65.5%；不同喷嘴之间的拉伸率随迹线长度的增大而增大，jet1和jet9位置处的拉伸率与其余喷嘴相比较大；相同喷嘴之间拉伸率随Re的增大而增大，Re=6346、9519和12692的拉伸率与Re=3173相比分别提高289%~320%、418%~454%和607%~667%。

关键词: 循环射流混合槽, 计算流体力学, 两相流, 混合, 拉伸率

Abstract:

As a kind of efficient mixing device, the circulating jet mixing tank has the function of chemical process intensification and has potential industrial application prospect. Insufficient study of the flow and mixing performance of multiphase system in the reactor restricts the optimal design and industrial application. In the present study, the two-phase flow of water and dimethyl silicone oil was considered. The Eulerian-Eulerian multiphase flow model and SST k-?ω turbulence model in the computational fluid dynamics (CFD) software ANSYS Fluent V16.1 was adopted to investigate the dimensionless jet centerline velocity, segregation intensity, stretching rate of the liquid-liquid two-phase in the circulating jet mixing tank by two feeding methods. It is found that the energy consumption of jet entrainment increases with the increase of dispersed phase concentration (α_d). For l/s<0.4, the attenuation of dimensionless jet centerline velocity at α_d=1.80% and 2.86% weakens by 51% and 21% compared with that at α_d=6.00%, respectively. At low dispersed phase concentration, the increase of Re has little effect on the dimensionless jet centerline velocity. For l/s<0.24, the attenuation of dimensionless jet centerline velocity at Re=6346, 9519 and 12692 weakens by 2.60%, 2.87% and 12.69% in comparison with that at Re=3173, respectively. The segregation intensity decreases with the increase of mixing time. With the increase of circumferential angle, it presents a W shaped trend. Under the same conditions of dispersed phase fraction and Reynolds number, the mixing time in the CJT feed by the symmetrical spherical shape was reduced by 65.5% compared with that of the cylindrical shape. The stretching rate at different nozzles increases with the increase of the path line, and the stretching rate at the positions of jet1 and jet9 were larger than that of the other nozzles. The stretching rate of Re=6346, 9519 and 12692 increased by 289%—320%, 418%—454% and 607%—667% compared with that of Re=3173, respectively.

Key words: circulating jet tank, computational fluid dynamics (CFD), two-phase flow, mixing, stretching rate

中图分类号:

TB126

孟辉波, 刘振江, 禹言芳, 张平, 吴剑华. 循环射流混合槽内液液两相混合特性数值模拟[J]. 化工进展, 2021, 40(11): 5939-5948.

MENG Huibo, LIU Zhenjiang, YU Yanfang, ZHANG Ping, WU Jianhua. Computational simulation of liquid-liquid two-phase mixing characteristics in the circulating jet tank[J]. Chemical Industry and Engineering Progress, 2021, 40(11): 5939-5948.

图/表 12

图1 CJT的几何模型及Patch位置

表1 Patch参数

Patch方式	直径D或球心/mm	高度或直径/mm	相含率α_d/%
柱状	400	z=392.80~400.00	1.80
柱状	400	z=388.56~400.00	2.86
柱状	400	z=376.00~400.00	6.00
对称球状	（92，0，300）（-92，0，300）（0，92，300）（0，-92，300）	d_p=88.20	2.86

图2 循环射流混合槽不同位置处网格

图3 不同网格数量下的量纲为1射流中心线速度

图4 变异系数随混合时间变化

图5 量纲为1射流中心线速度变化规律

图6 不同位置处的速度流线及等值线

图7 射流孔处速度等值线图

图8 离析强度变化规律（Re=6346；z=388.56~400mm）

图9 不同加料方式对混合与流动的影响（Re=6346；z/H=0.5；αd=2.86%）

图10 Re=6346时速度迹线图

图11 不同条件下的拉伸率变化（t=28s；αd=2.86%）

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循环射流混合槽内液液两相混合特性数值模拟

Computational simulation of liquid-liquid two-phase mixing characteristics in the circulating jet tank

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