Structure of Liquid Jets and Wetting Front in the Refrigerant Mixture Falling Films at Various Contact Angles

IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL Journal of Engineering Thermophysics Pub Date : 2023-12-14 DOI:10.1134/S1810232823040021
A. Yu. Sakhnov, A. N. Pavlenko, N. I. Pecherkin, O. A. Volodin
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Abstract

The paper presents 3D numerical modeling of spreading dynamics of R21 (mol. fraction: 0.9) and R114 refrigerant mixture film. We considered an outer flow along a round vertical cylinder at Reynolds number 104 and contact angles of 10°, 30°, 50°, 70°, and 90°. The simulation was performed in OpenFOAM software on the basis of the volume of fluid (VOF) method. Simulated results show an occurrence of the liquid jets flowing from the upper continuous falling film in the range of contact angles 30°–90°, while the liquid flow at contact angle of 10° keeps the only continuous film till the bottom boundary of the cylinder. We defined two scenarios for wetting of the cylinder sidewall at different contact angles: liquid near the contact line moves down and towards to the cylinder surface at \(\theta = 10^\circ\), 30°, and 50°, while only vertical velocity differs from zero at \(\theta = 70^\circ\) and 90°, excluding jets at \(\theta = 70^\circ\). The increase of the contact angle leads to complication of the structure of the refrigerant mixture falling films, arising of jets and redistribution of flow rate between them.

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不同接触角下制冷剂混合物落膜中的液体射流和润湿前沿的结构
摘要本文建立了R21(摩尔分数:0.9)和R114制冷剂混合膜扩散动力学的三维数值模拟。我们考虑在雷诺数为104,接触角为10°,30°,50°,70°和90°时沿圆形垂直圆柱体的外部流动。基于流体体积法(VOF),在OpenFOAM软件中进行仿真。模拟结果表明,在接触角为30°~ 90°的范围内,上层连续落膜出现了液体射流,而接触角为10°的液体流动使唯一的连续落膜一直持续到气缸底边界。我们定义了两种不同接触角下气缸侧壁湿润的情况:接触线附近的液体在\(\theta = 10^\circ\)、30°和50°处向下移动并朝向气缸表面,而在\(\theta = 70^\circ\)和90°处只有垂直速度与零不同,\(\theta = 70^\circ\)处不包括射流。接触角的增大导致了冷媒混合物落膜结构的复杂化、射流的产生和流率的重新分布。
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来源期刊
Journal of Engineering Thermophysics
Journal of Engineering Thermophysics THERMODYNAMICS-ENGINEERING, MECHANICAL
CiteScore
2.30
自引率
12.50%
发文量
0
审稿时长
3 months
期刊介绍: Journal of Engineering Thermophysics is an international peer reviewed journal that publishes original articles. The journal welcomes original articles on thermophysics from all countries in the English language. The journal focuses on experimental work, theory, analysis, and computational studies for better understanding of engineering and environmental aspects of thermophysics. The editorial board encourages the authors to submit papers with emphasis on new scientific aspects in experimental and visualization techniques, mathematical models of thermophysical process, energy, and environmental applications. Journal of Engineering Thermophysics covers all subject matter related to thermophysics, including heat and mass transfer, multiphase flow, conduction, radiation, combustion, thermo-gas dynamics, rarefied gas flow, environmental protection in power engineering, and many others.
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