Lightnin静态混合器内气泡分散流体动力学特性实验研究

doi:10.11949/0438-1157.20220313

化工学报 ›› 2022, Vol. 73 ›› Issue (8): 3565-3575.DOI: 10.11949/0438-1157.20220313

Lightnin静态混合器内气泡分散流体动力学特性实验研究

禹言芳¹^,²(), 刘桓辰¹^,², 孟辉波¹^,²(), 刘励图¹^,², 李毓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:2022-03-02 修回日期:2022-04-27 出版日期:2022-08-05 发布日期:2022-09-06
通讯作者: 孟辉波
作者简介:禹言芳(1979—)，女，博士，副教授，taroyy@163.com
基金资助:
辽宁特聘教授计划项目(辽教函[2018]35号);国家自然科学基金项目(21476142);辽宁省教育厅高等学校基本科研项目重点项目(LJKZ0429);辽宁省“百千万人才工程”人选项目(201892151);辽宁省自然科学基金项目(2022-MS-0310);沈阳市中青年科技创新人才计划项目(RC200032)

Experimental investigation of turbulent dispersion and hydrodynamic behavior of bubble in Lightnin static mixer

Yanfang YU¹^,²(), Huanchen LIU¹^,², Huibo MENG¹^,²(), Litu LIU¹^,², Yu LI¹^,², Jianhua WU¹^,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:2022-03-02 Revised:2022-04-27 Online:2022-08-05 Published:2022-09-06
Contact: Huibo MENG

摘要/Abstract

摘要：

以Lightnin静态混合器（LSM）内水-空气气液两相体系为研究对象，在连续相水表观速度U_L=0.071~0.127 m/s和离散相空气表观速度U_G=0.007~0.042 m/s的条件下，研究内径100 mm的LSM内气液两相湍流流动阻力与气泡分散水动力学行为。使用分辨率为1920×1080的高速相机Revealer-2F04M采集混合器内不同轴向窗口的气泡群演化过程。结果表明：当U_L<0.085 m/s和U_G=0.025~0.042 m/s时，LSM内的流型为泡状流。随着气泡群流经混合元件数的增加，气泡群的Sauter平均直径d₃₂逐渐减小。当液体表观速度U_L≤0.085 m/s时，Sauter平均直径d₃₂随气体表观速度的增加先减小后增大；U_G =0.028 m/s时d₃₂达到局部最小值，53%的气泡直径d_B/D₀在0.02~0.05范围内。Sauter平均直径、内径与无量纲停留时间τ之间的关系满足d₃₂/D₀=0.031τ^-0.14We^-0.41。平均气含率α的增大显著增加了单位体积内气泡数量密度，加剧气泡与元件表面碰撞频率，增大旋涡二次流强度，导致摩擦系数显著降低；采用Lockhart-Martinelli方法对实验数据回归，得到气液两相流压降预测常数C的关联式：C=5.26×10⁵U_G^-0.91/Re^0.74。

关键词: 静态混合器, 气液两相, Sauter平均直径, 气含率, 压降

Abstract:

The gas-liquid two-phase bubbly flow in a Lightnin static mixer (LSM) with a diameter of 100 mm and an aspect ratio of 1.0 was investigated. The turbulent dispersion and hydrodynamic behavior of bubble groups was focused under the conditions of liquid phase superficial velocity U_L=0.071—0.127 m/s and gas phase superficial velocity U_G=0.007—0.042 m/s. The evolution of bubble populations in different axial windows in the mixer was collected by using a high-speed camera Revealer-2F04M with a resolution of 1920×1080. The results show that the flow pattern in the LSM is in bubbly flow at the superficial velocity of continuous phase U_Lno more than 0.085 m/s and U_G=0.025—0.042 m/s. The Sauter mean diameter d₃₂ of bubble groups gradually decreased with the increase of axial mixing length. With the given liquid flow superficial velocity U_L≤0.085 m/s, the Sauter mean diameter d₃₂ firstly decreased and then increased with the increase of gas flow superficial velocity. The local minimum of d₃₂ was obtained at U_G=0.028 m/s and 53% of the d_B/D₀ is in the range of 0.02—0.05. The relationship among Sauter mean diameter, the inner diameter and the non-dimensional residence time satisfies the correlation d₃₂/D₀=0.031τ^-0.14We^-0.41. As the gas superficial velocity increases, the density function of the number of bubbles per unit volume increases significantly. The probability of bubble collided with the surfaces of the element is enhanced which increases the intensity of the vortex secondary flow and leads to a significant decrease in the friction coefficient. By fitting the pressure drop of two-phase flow, the empirical correlation prediction formula C=5.26×10⁵ $U G - 0.91$ /Re^0.74 was obtained.

Key words: static mixer, gas-liquid flow, Sauter mean diameter, gas holdup, pressure drop

中图分类号:

TQ 051.7

禹言芳, 刘桓辰, 孟辉波, 刘励图, 李毓, 吴剑华. Lightnin静态混合器内气泡分散流体动力学特性实验研究[J]. 化工学报, 2022, 73(8): 3565-3575.

Yanfang YU, Huanchen LIU, Huibo MENG, Litu LIU, Yu LI, Jianhua WU. Experimental investigation of turbulent dispersion and hydrodynamic behavior of bubble in Lightnin static mixer[J]. CIESC Journal, 2022, 73(8): 3565-3575.

图/表 14

图1 LSM混合元件结构

Fig.1 The structure of LSM

图2 LSM内气液两相流实验装置

Fig.2 Experimental setup of the gas-liquid two-phase flow in LSM

图3 实验操作条件

Fig.3 The experimental conditions

图4 UL=0.127 m/s和UG=0.007 m/s下LSM内不同测量窗口的气泡群分布

Fig.4 The bubble group distribution in the different measurement windows of LSM at UL=0.127 m/s and UG=0.007 m/s

图5 UL=0.071 m/s时不同气相表观速度下MW0652位置处的气泡群演化

Fig.5 The bubble group distribution at the MW0652 and UL=0.071 m/s with different gas superficial velocities

图6 气泡d32与混合元件数量N的关系

Fig.6 Relationship between the bubble d32 and the number of mixing elements N

图7 不同轴向测量位置气泡直径概率密度分布

Fig.7 Probability density distribution of bubble diameter at different axial monitoring locations

图8 KSM和LSM不同轴向位置d32对比

Fig.8 Comparison of average bubbles d32 of KSM and LSM in different axial positions

图9 MW0935位置处d32分布及线性拟合

Fig.9 The distribution of d32 and linear fitting at the MW0935 window

图10 MW0935位置处d32随气相表观速度变化规律

Fig.10 The distribution of d32 at the MW0935 window under different gas superficial velocities

图11 LSM内概率和累积密度分布（MW0652,UL=0.071 m/s）

Fig.11 Probability and cumulative density distribution of bubble mean diameter in LSM

图12 无量纲d32/(D0We-0.41)与无量纲停留时间τ的关系

Fig.12 Relationship between the dimensionless d32/(D0We-0.41) and dimensionless residence time τ

图13 摩擦系数随液体表观速度的变化

Fig.13 The Darcy friction factor varies with the liquid superficial velocity

表1 两相流压降预测参数

Table 1 Pressure drop prediction parameters of two-phase flow

U_L/(m/s)	χ	Φ_L	Φ_G	C
0.071	124.506	545.650	8.46×10⁶	6.78×10⁴
0.078	94.986	465.540	4.20×10⁶	4.41×10⁴
0.085	79.729	398.377	2.53×10⁶	3.17×10⁴
0.092	72.922	344.094	1.83×10⁶	2.50×10⁴
0.099	68.003	305.282	1.41×10⁶	2.07×10⁴
0.106	64.279	270.396	1.12×10⁶	1.73×10⁴
0.113	61.361	245.682	0.93×10⁶	1.50×10⁴
0.120	59.012	220.837	0.77×10⁶	1.30×10⁴
0.127	57.080	200.486	0.65×10⁶	1.14×10⁴

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Lightnin静态混合器内气泡分散流体动力学特性实验研究

Experimental investigation of turbulent dispersion and hydrodynamic behavior of bubble in Lightnin static mixer

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