研究液滴与运动薄膜的碰撞特性及其与静止薄膜的比较:非稳态和三维 CLSVOF 方法

IF 1.9 3区 工程技术 Q3 MECHANICS
Pouyan Adibi, Seyed Ahmad Kamalnadian, Kazem Mohammadzadeh
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引用次数: 0

摘要

本研究涉及液滴撞击运动薄膜的瞬态三维数值研究及其与静态薄膜的比较。在建模过程中,采用了 CLSVOF(液位和流体体积耦合)方法进行液滴冲击分析。研究了薄膜雷诺数(830 < Ref < 4478)、非维薄膜厚度(0.25 < h* < 0.75)、液滴韦伯数(249 < We < 1762)、非维时间(0.5 < τ < 4.0)和冲击角(0°、30° 和 60°)对界面演变的参数影响。此外,还将研究结果与之前研究人员获得的液滴撞击静态薄膜的结果进行了比较,在大多数情况下,观察到的结果与液滴撞击静态薄膜的结果一致。然而,由于移动薄膜运动的独特效果,液滴撞击移动薄膜在某些情况下显示出不同的行为。将薄膜速度提高一倍以及将液滴速度降低 57%,分别导致了 8.3% 和 6.66% 的树冠不对称和下游树冠的抑制。在所有情况下,都观察到树冠向下游流动方向滑移。将流膜速度增加一倍,平均可使冠高度降低 18.5%,直径增加 10.48%。然而,它对火山口直径的影响可以忽略不计(1%)。流体膜厚度从 0.5 毫米增加到 1 毫米(h* 从 0.25 增加到 0.5),为上游岩冠提供了动力,平均增加了 10.57% 的高度。在 3 米/秒(We = 249)的低冲击速度下,树冠直径比 7 米/秒(We = 1358)时的直径平均大 26.7%。通过将液滴撞击角增大到 60 度并克服流体膜速度的影响,水冠的行为与液滴撞击静态膜时的行为相同。最后,为了预测上游树冠高度、下游树冠高度、树冠直径和凹坑直径,建立了四种新的五变量相关关系(取决于 τ、θ、Ref、We 和 h*)。结论是数值数据与相关结果之间存在良好的一致性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Investigation of droplet collision characteristics with moving film and its comparison with stationary film: unsteady and 3D CLSVOF method

Investigation of droplet collision characteristics with moving film and its comparison with stationary film: unsteady and 3D CLSVOF method

This research deals with a numerical study of a drop impacting a moving film as a transient three-dimensional and its comparison with static film. For the modeling, the CLSVOF (Coupled Level Set and Volume of Fluid) method has been used for drop impact analysis. The parametric effects of film Reynolds number (830 < Ref < 4478), non-dimensional film thickness (0.25 < h* < 0.75), drop Weber number (249 < We < 1762), non-dimensional time (0.5 < τ < 4.0), and impact angle (0°, 30°, and 60°), on the interface evolution, was investigated. Further, the results have been compared to drop-impacting static film obtained by previous researchers, whereby in most cases consists of the results with drop-impacting static film have been observed. However, the drop impacting the moving film indicated a different behavior in some cases because of the unique effect of the moving film movement. Doubling the film velocity as well as a 57% reduction in the drop velocity, caused an 8.3% and 6.66% increase in the crown asymmetry and suppression of the downstream crown. The crown slip toward the downstream flow was observed in all cases. Doubling the fluid film velocity, on average, reduced the crown height by 18.5% and increased its diameter by 10.48%. However, its effect on the crater diameter was negligible (1%). An increase in the film thickness from 0.5 mm to 1 mm (h* from 0.25 to 0.5), fed the upstream crown, and on average, increased its height by 10.57%. At a low impact velocity of 3 m/s (We = 249), the crown diameter was, on average, 26.7% larger than its diameter at the velocity of 7 m/s (We = 1358). By increasing the drop impact angle to 60 degrees and overcoming the effect of the fluid film velocity, the crown behavior was the same as its behavior with the drop impact on the static film. Finally, to predict the upstream crown height, downstream crown height, crown diameter, and crater diameter, four novel five-variable correlations (depending on τ, θ, Ref, We, and h*) are developed. It is concluded that a good agreement exists between the numerical data, and correlation results.

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来源期刊
Meccanica
Meccanica 物理-力学
CiteScore
4.70
自引率
3.70%
发文量
151
审稿时长
7 months
期刊介绍: Meccanica focuses on the methodological framework shared by mechanical scientists when addressing theoretical or applied problems. Original papers address various aspects of mechanical and mathematical modeling, of solution, as well as of analysis of system behavior. The journal explores fundamental and applications issues in established areas of mechanics research as well as in emerging fields; contemporary research on general mechanics, solid and structural mechanics, fluid mechanics, and mechanics of machines; interdisciplinary fields between mechanics and other mathematical and engineering sciences; interaction of mechanics with dynamical systems, advanced materials, control and computation; electromechanics; biomechanics. Articles include full length papers; topical overviews; brief notes; discussions and comments on published papers; book reviews; and an international calendar of conferences. Meccanica, the official journal of the Italian Association of Theoretical and Applied Mechanics, was established in 1966.
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