二元液滴自由碰撞聚并后的振荡行为研究

doi:10.11949/0438-1157.20191460

化工学报 ›› 2020, Vol. 71 ›› Issue (4): 1482-1490.DOI: 10.11949/0438-1157.20191460

二元液滴自由碰撞聚并后的振荡行为研究

李睿^1,²(),张以任^1,²,陈杭^1,^2,³(),路贵民^1,²,于建国^1,²

^1. 华东理工大学资源过程工程教育部工程研究中心, 上海 200237
^2.国家盐湖资源综合利用工程技术研究中心，上海 200237
^3.上海污染控制与生态安全研究院，上海 200292

收稿日期:2019-12-02 修回日期:2019-12-31 出版日期:2020-04-05 发布日期:2020-04-05
通讯作者: 陈杭
作者简介:李睿（1995—），女，硕士研究生，314695388@qq.com
基金资助:
国家自然科学基金项目(U1607115);中国博士后科学基金项目(2018T110357);中央高校基本科研业务费专项基金项目(50321021917008)

Investigation on droplet oscillatory behavior after free binary collision and coalescence

Rui LI^1,²(),Yiren ZHANG^1,²,Hang CHEN^1,^2,³(),Guimin LU^1,²,Jianguo YU^1,²

^1.Engineering Research Center of Resource Process Engineering, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China
^2.National Engineering Research Center for Integrated Utilization of Salt Lake Resource, Shanghai 200237, China
^3.Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China

Received:2019-12-02 Revised:2019-12-31 Online:2020-04-05 Published:2020-04-05
Contact: Hang CHEN

摘要/Abstract

摘要：

以甲苯、超纯水为多相系统研究对象，采用高速摄像机测试分析了二元液滴自由碰撞聚并后的振荡行为特性。实验结果表明，聚并后甲苯液滴振荡过程存在明显的周期性与阻尼衰减机制，液滴Reynolds数、Weber数是影响聚并后液滴振荡周期、阻尼系数的关键无量纲参数。液滴惯性力与振荡周期呈正相关性，而液滴黏性力则主导了振荡过程的阻尼衰减机制，振荡阻尼系数随黏性力的增加而增加，同时，液滴碰撞聚并作用与其后续振荡过程相对独立，即碰撞聚并过程对液滴振荡行为特性无明显影响。此外，液滴振荡过程特性参数的实验与理论计算对比结果显示，振荡周期实验结果相较于理论值略微偏高，振荡周期、阻尼系数实验与计算值相对误差的标准差分别为14.9%和44.9%。

关键词: 多相流, 流体力学, 自由碰撞, 聚结, 液滴振荡

Abstract:

Toluene and ultrapure water were used as the research object of the multiphase system. The high-speed camera test was used to analyze the oscillation behavior of binary droplets after free collision and coalescence. The experimental results show that the oscillation process of toluene droplets after coalescence has obvious periodicity and damping attenuation mechanism, and the Reynolds number, Weber number of droplets are the key dimensionless parameters affecting the process. There is a positive correlation between the inertial force and the oscillation period, while the viscous force dominates the damping attenuation mechanism of the oscillation process. It indicates that the damping coefficient increases with the increasing viscous force. At the same time, the collisional coalescence of droplets is relatively independent of its subsequent oscillation process, which means the collisional coalescence process has no obvious effect on the oscillation behavior of the droplet. In addition, the experimental and theoretical comparison show that the experimental results of the oscillation period are slightly higher than the theoretical values. In general, the standard deviations of the relative errors between experiment and calculation are 44.9% and 14.9% for the damping coefficient and oscillation period, respectively.

Key words: multiphase flow, fluid mechanics, free collision, coalescence, droplet oscillation

中图分类号:

TQ 021.1

李睿, 张以任, 陈杭, 路贵民, 于建国. 二元液滴自由碰撞聚并后的振荡行为研究[J]. 化工学报, 2020, 71(4): 1482-1490.

Rui LI, Yiren ZHANG, Hang CHEN, Guimin LU, Jianguo YU. Investigation on droplet oscillatory behavior after free binary collision and coalescence[J]. CIESC Journal, 2020, 71(4): 1482-1490.

图/表 14

表1 甲苯-水体系物性数据

Table 1 Physical properties of toluene-water

物性参数	T = 15℃		T = 25℃		T = 35℃
物性参数	水	甲苯	水	甲苯	水	甲苯
密度ρ /(kg·m^-3)	999.10	871.78	997.06	862.19	994.04	852.85
黏度μ /(kg·m^-1·s^-1)	11.4×10^-4	5.52×10^-4	8.95×10^-4	5.60×10^-4	7.27×10^-4	5.03×10^-4
界面张力σ /(N·m^-1)	3.80×10^-2		3.61×10^-2		3.51×10^-2

图1 实验装置

Fig.1 Experimental device

图2 二元自由液滴碰撞聚并及其阻尼振荡过程

Fig.2 Free binary droplets collision, coalescence and its oscillatory behavior

图3 实验数据拟合处理结果

Fig.3 Fitting results of experimental data and theoretical model

图4 液滴等效直径对阻尼系数的影响

Fig.4 Effect of droplet equivalent diameter on damping coefficient

图5 液滴等效直径对振荡周期的影响

Fig.5 Effect of droplet equivalent diameter on oscillation period

图6 二元液滴相对速度对阻尼系数的影响

Fig.6 Effect of binary droplets relative velocity on damping coefficients

图7 二元液滴相对速度对振荡周期的影响

Fig.7 Effect of binary droplets relative velocity on oscillation periods

图8 液滴聚并后无量纲参数对阻尼系数的影响

Fig.8 Effect of droplets dimensionless number after coalescence on damping coefficients

图9 液滴聚并后无量纲参数对振荡周期的影响

Fig.9 Effect of droplets dimensionless number after coalescence on oscillation period

图10 实验与理论阻尼系数对比

Fig.10 Comparison of experimental and theoretical damping coefficients

图11 实验与理论频率对比

Fig.11 Comparison of experimental and theoretical frequence

图12 二元液滴Reynolds数比值对阻尼系数偏差的影响

Fig.12 Effect of droplets ratio of Reynolds number on deviation of damping coefficient

图13 二元液滴Reynolds数比值对振荡频率偏差的影响

Fig.13 Effect of droplets ratio of Reynolds number on deviation of oscillation frequency

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二元液滴自由碰撞聚并后的振荡行为研究

Investigation on droplet oscillatory behavior after free binary collision and coalescence

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