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摘要

在考虑空气阻力影响, 确定液滴撞击球面速度的基础上, 对较高韦伯数液滴撞击干燥球面动态行为过程进行了实验研究, 分析了球面曲率与韦伯数对液滴撞击行为和铺展因子的影响, 并与前人撞击平面结果进行了对比. 实验表明, 靠近撞击球面时, 液滴降落速度出现明显波动; 球面曲率对液滴撞击后行为影响明显, 曲率较大时, 液滴撞击后铺展液膜会超出球面直径并滑落, 曲率较小时, 液滴撞击后在球面上呈现明显的铺展、回缩、震荡、着附动态变化行为, 此时最大铺展因子受曲率影响小, 随曲率减小, 逐渐趋向于撞击平面时的最大铺展因子; 韦伯数对液膜铺展速率影响较小, 但对液膜回缩时间影响明显, 最大铺展因子随韦伯数增加逐渐增大, 获得的关联式呈指数变化.

关键词:

液滴/
撞击/
球面/
流体动力学

Abstract

The phenomenon that droplets impacting on the solid surface is ubiquitous in industrial applications such as spray cooling, spray painting, ink-jet printing, and fuel-air mixing internal combustion engines. The dynamic of droplet impacting on solid surface has been a hot topic in the area of fluid mechanics. Most of the existing experimental studies focused on the droplet impacting on flat or cylinder surface whereas the droplet impacting on a dry sphere surface, especially its effect from the sphere curvature, has been less investigated. Therefore, the dynamic behavior of a droplet impacting normally on a dry sphere is experimentally investigated at the relatively high Reynolds and Weber number in the present work. The impacting velocity of the droplet on the sphere is discussed with consideration of air resistance effect. The influences of spherical curvature and Weber number on the dynamic behavior and spreading factor are analyzed. The experimental results are compared with those of previous impacting flat researches. The results show that the drop velocity fluctuates significantly near the impacting sphere. The influence of the spherical curvature on the dynamic behavior of the droplet impact is obvious. The maximum spreading diameter of the liquid film will exceed that of the sphere with a curvature greater than 0.2 mm ^–1, and some segments of the liquid film rim even slide down directly. When the spherical curvature is less than 0.167 mm ^–1, the dynamic behaviors of the impacting droplet will undergo the spread, retraction, oscillation, and stable attachment after impacting. Then the maximum spreading factor of the droplet impacting sphere is little influenced by the curvature, and gradually tends to that of the droplet impacting plane with curvature decreasing. The Weber number has little influence on the spreading velocity of the liquid film, but obvious on the retraction. The maximum spreading factor gradually increases with Weber number increasing. A simple empirical correlation for the maximum spreading factor is obtained. This study conduces significantly to further investigating the dynamic characteristics of droplets impacting on the sphere.

Keywords:

作者及机构信息

通信作者:王关晴,gqwang@hdu.edu.cn

基金项目:浙江省自然科学基金(批准号: LY15E060007)和国家自然科学基金(批准号: 11574067)资助的课题

Authors and contacts

Corresponding author:Wang Guan-Qing,gqwang@hdu.edu.cn

Funds:Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant No. LY15E060007) and the National Natural Science Foundation of China (Grant No.11574067)

文章全文: translate this paragraph

参考文献

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施引文献

下载: 全尺寸图片幻灯片

壁面结构	平面	球形	球形	球形	球形	球形	球形
撞击小球直径d/mm	∞	8	16	20	40	60	80
曲率δ/mm^–1	0	0.250	0.125	0.100	0.050	0.034	0.025

下载: 导出CSV

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