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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (5): 991-998    DOI: 10.3785/j.issn.1008-973X.2021.05.020
材料与化学工程     
Al2O3纳米流体液滴撞击壁面的动力学行为数值研究
胡定华(),刘诗雨
南京理工大学 能源与动力工程学院，江苏 南京 210094
Numerical study on dynamic behaviors of Al2O3 nanofluid droplet impacting on solid wall
Ding-hua HU(),Shi-yu LIU
School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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摘要：

针对纳米流体液滴撞击固体壁面的动力学行为，建立基于相场方法描述液滴动态过程的二维数值模型，引入Kistler动态接触角模型以模拟铺展过程中液滴动态接触角变化以及三相接触线的迁移. 通过模拟分析液滴铺展因子、无量纲高度的变化研究不同纳米颗粒体积分数、惯性力和液滴直径等因素对水基Al2O3纳米流体液滴撞击壁面的铺展回缩过程的影响机制. 结果表明：超过一定体积分数的纳米颗粒使流体表现出明显的剪切稀化特性，增加液滴的黏性耗散，抑制液滴的铺展回缩过程；液滴撞击速度的增加会增大其撞击壁面时最大铺展直径和达到稳定状态的耗时，直径的增加使液滴振荡周期加长；体积分数为4%的纳米颗粒可以抑制上述两者带来的影响，使液滴更快到达稳定状态.
关键词： 纳米流体;  液滴;  撞击壁面;  体积分数;  相场方法    
Abstract:

The dynamical behavior of nanofluid droplet impacting on the solid wall was numerically studied. A two-dimensional numerical model based on the phase-field method was established, and the Kistler dynamic contact angle model was introduced to describe the evolution of droplet contact angle and three-phase contact line during spreading. The influences of nanoparticle volume fraction, inertia force and droplet diameter on the spreading and retraction behaviors of water-based Al2O3 nanofluid droplets were studied in terms of spreading factor and dimensionless height. Results indicated that the nanoparticles with volume fraction over a certain value made the fluid exhibit obvious shear-thinning characteristics, which can increase the viscous dissipation of droplets and suppress the spreading and retraction process of droplets. The increase of droplet initial velocity would increase the maximum spreading diameter and the time to reach the stable state when it impacts on the solid surface, while the increase of droplet diameter would lengthen the oscillation period of the droplet. It is also found that the nanoparticles of 4% volume fraction can suppress the influence of increase of droplet initial velocity and diameter, and help the droplet faster to reach stable state.
Key words: nanofluid    droplet    surface impingement    volume fraction    phase-field method
收稿日期: 2020-05-12 出版日期: 2021-06-10
CLC:  TQ 21.1  
基金资助: 国家自然科学基金青年基金资助项目（51706102）；中央高校基本科研业务费专项资金资助项目（30917011325）
作者简介: 胡定华（1986—），男，讲师，博士，从事微尺度相变散热研究. orcid.org/0000-0002-2725-7389. E-mail： dhhu@njust.edu.cn
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胡定华
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引用本文:

胡定华,刘诗雨. Al2O3纳米流体液滴撞击壁面的动力学行为数值研究[J]. 浙江大学学报(工学版), 2021, 55(5): 991-998.

Ding-hua HU,Shi-yu LIU. Numerical study on dynamic behaviors of Al2O3 nanofluid droplet impacting on solid wall. Journal of ZheJiang University (Engineering Science), 2021, 55(5): 991-998.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.05.020    或    http://www.zjujournals.com/eng/CN/Y2021/V55/I5/991

图 1  液滴撞击固体表面物理模型
$\varphi _{\rm{p}} $/% m n
1 0.0060 0.599
2 0.0118 0.614
3 0.0458 0.641
4 0.2562 0.678
表 1  纳米流体液滴幂律参数
图 2  液滴网格细化
图 3  网格无关性验证
图 4  液滴撞击壁面实验结果[31-33]和本研究所建模型模拟结果的验证对比
图 5  纯水与不同颗粒体积分数的纳米流体液滴铺展因子变化曲线
图 6  纯水与不同颗粒体积分数的纳米流体液滴无量纲高度变化曲线
图 7  纯水与不同颗粒体积分数的纳米流体液滴在不同初速度下的铺展因子变化曲线
图 8  纯水液滴与4%体积分数的纳米流体液滴在相同时间的模拟结果对比
图 9  纯水与不同颗粒体积分数的纳米流体液滴在不同直径下的铺展因子变化曲线
图 10  纯水与不同颗粒体积分数的纳米流体液滴在不同直径下的最大铺展因子
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