两个连续液滴撞击倾斜固体表面的实验研究

IF 1.5 4区 工程技术 Q3 MECHANICS Journal of Mechanics Pub Date : 2021-06-12 DOI:10.1093/JOM/UFAB012
Chun-Kuei Chen, Sheng-Qi Chen, Wei‐Mon Yan, Wen‐Ken Li, Ta-Hui Lin
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引用次数: 1

摘要

本研究涉及两个连续液滴在倾斜固体表面上的碰撞实验。主要关注不同表面倾斜角度(Φ)的撞击时机对撞击现象的影响,主要影响最大液滴扩散直径。研究考虑了四种不同撞击时间的撞击场景,即案例1:单液滴撞击;Δt1的情形2:先导液滴开始沿斜表面扩散的时刻;Δt2的情形3:先导液滴到达最大扩散时刻;Δt3的情形4:领头液滴开始缩回的时刻。研究发现,由于重力效应的增强和碰撞时间的不同,连续两个液滴在倾斜表面上的变形行为经历了复杂的不对称形态演变。合并后的液滴在最终稳定形状时,随着斜面角的增大而变细,导致前后接触角值减小。撞击时间对合并液滴最大高度的变化有显著影响。聚结液滴在Δt = Δt2、倾斜角度Φ = 45°处扩散到最大无因次宽度直径,在Φ = 30°处达到最大无因次高度Δt = Δt2。在所有碰撞正时条件下,前接触角最终收敛于一个固定值,且随着表面倾角的增大,前接触角逐渐减小。
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Experimental study on two consecutive droplets impacting onto an inclined solid surface
The present study is concerned with the experimental impingement of two consecutive droplets on an inclined solid surface. Attention is mainly paid to the effects of impingement timing with various oblique angles (Φ) of the surface on the impact phenomena, which mainly affect the maximum droplet spreading diameter. The investigation considers four impingement scenarios differentiated by impingement timing, namely Case 1: single-droplet impingement; Case 2 of Δt1: the moment when the leading droplet starts spreading along the oblique surface; Case 3 of Δt2: the moment when the leading droplet reaches its maximum spreading; and Case 4 of Δt3: the moment when the leading droplet starts retracting. It is observed that deformation behavior of two successive droplets impacting on the inclined surface experiences a complex asymmetric morphology evolution due to the enhancement of gravity effect and various conditions of the impingement timing. The merged droplet becomes slender with increasing oblique surface angle in the final steady shape, causing the decrease in the value of front and back contact angles. The impingement timing has a significant influence on the change of the maximum height of the merged droplet. The coalesced droplet spreads to the maximum dimensionless width diameter at Δt = Δt2 and the oblique angle of Φ = 45°, but reaches the maximum dimensionless height for Δt = Δt2 at Φ = 30°. The front contact angles converge to a fixed value eventually for all conditions of impingement timing, and the values become lower with the increasing surface inclination.
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来源期刊
Journal of Mechanics
Journal of Mechanics 物理-力学
CiteScore
3.20
自引率
11.80%
发文量
20
审稿时长
6 months
期刊介绍: The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.
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