螺旋液桥降膜规整填料螺线间隙液桥形成与流动

doi:10.16085/j.issn.1000-6613.2021-0645

摘要/Abstract

摘要：

液桥是螺旋液桥降膜规整填料的重要特征，存在于螺线间隙，将两个相距一定距离的平行螺线连接起来，目前对螺线间隙液桥形成和流动的研究鲜有报道。为了研究螺旋液桥降膜规整填料各参数和液相负荷对液桥的影响，以及液桥在填料螺线间隙的流动形式，本文搭建了流体流动观测实验装置，通过配备微距镜头的高清相机和高速摄像仪，结合示踪粒子追踪方法，观测了液桥在不同规格螺线间隙的形成、变化和流动形式。结果表明，在一定的液相负荷下，不同规格螺线间隙均能形成稳定且连续的液桥，螺线直径和宽度对液桥的形成、变化和流动影响不大，螺线间隙宽度越小、液体体积越大，液桥越稳定，但液桥表面积会减小。同时，液桥边界随着液相负荷的增加会由凹变平，通过图像慢放发现，液桥在螺线间隙沿着螺旋线方向螺旋下降。本研究对螺旋液桥降膜规整填料结构参数设置及应用具有重要指导意义。

关键词: 螺旋降膜, 液桥, 规整填料, 流体流动与示踪

Abstract:

Liquid-bridge is an important feature of helical liquid-bridge flow structured packings. It exists in the helical channels and connects two parallel helical string. However, there are few studies on the formation and fluid flow of liquid bridge in helical channels. To investigate the influence of the different structured parameters of the helical liquid-bridge flow structured packings and liquid load on the liquid-bridge, and the flow behavior of liquid-bridge in the helical channels, the lab-scale fluid flow observation rig was built. Meanwhile, a high-definition camera and high-speed video camera equipped with a macro lens, combing with a particle tracking method, was used to observe the formation, change and flow behavior of the liquid-bridge in the helical channels. The results showed that a stable and continuous liquid-bridge could be formed in different helical channels. The diameter and width of the helical string had little effect on the formation, change and flow behavior of the liquid-bridge. The smaller the helical channels width, the larger the liquid load, the more stable the liquid bridge, but the surface area of the liquid-bridge would decrease. In addition, with the increase of the liquid load, the boundary of the liquid-bridge would change from concave to flat. It could be found by slow-motion of the image that the liquid-bridge spirally descended along the helical string in the helical channels. The present study provides insight into the setting and application of structure parameters of helical liquid-bridge flow structured packings.

Key words: helical falling film, liquid-bridge, structured packing, fluid flow and tracing

中图分类号:

TQ028.8

韩红明, 从海峰, 李洪, 高鑫, 李鑫钢. 螺旋液桥降膜规整填料螺线间隙液桥形成与流动[J]. 化工进展, 2022, 41(2): 584-592.

HAN Hongming, CONG Haifeng, LI Hong, GAO Xin, LI Xingang. Formation and fluid flow of helical channels liquid-bridge in helical liquid-bridge flow structured packings[J]. Chemical Industry and Engineering Progress, 2022, 41(2): 584-592.

图/表 12

图1 螺旋液桥降膜规整填料结构示意图及几何参数H—长度；D—直径；θ—螺旋线倾角；W—螺线间隙宽度；L—螺线宽度；B—螺线厚度

图2 流体流动测试装置示意图1—液体分布器；2—相机；3—转子流量计；4—水箱；5—离心泵；6—填料

表1 螺旋液桥降膜规整填料几何参数

项目名称	数值
螺线直径D/mm	12，14，16
螺线高度H/mm	150
螺线厚度B/mm	1
螺线宽度L/mm	2.5，3.0
螺线间隙宽度W/mm	1.0，1.5，2.0，2.5，3.0

图3 不同直径螺线间隙液桥形态

图4 不同螺线间隙宽度液桥边界轮廓（K表示液桥边界曲率）

图5 两平板间液桥变化观测实验装置1—相机；2—左右调节；3—液桥；4—旋转平台；5—固定平台；6—平板；7—角度调节；8—升降平台

图6 不同板间距和液体体积液桥边界轮廓变化

（Vb=2Va=2μL）

表2 不同物系最大液桥长度

物系

密度ρ

/kg·m^-3

表面张力σ

/mN·m^-1

液桥长度W_V_a^①

/mm

液桥长度W_V_a^②

/mm

图7 液桥边界随液相负荷变化

（W=2.0mm）

图8 液桥颈线半径随液相负荷变化

图9 液桥流动形式下示踪粒子的流动过程

（W=2.0mm，D=14mm，H=70mm，V0=80mL/min）

表3 不同规格螺线液体停留时间（V0=40mL/min）

长度H/mm	直径D/mm	螺距W/mm	螺线宽度B/mm	停留时间t/s
150	14	2.0	2.5	10.0
150	14	2.5	2.5	9.7
150	14	3.0	2.5	9.4
150	14	2.5	3.0	9.7
150	14	3.0	3.0	9.4
150	12	2.5	2.5	8.5
150	16	2.5	2.5	11.6

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