Analysis of an unsteady quasi-capillary channel flow with time-resolved PIV and RBF-based super-resolution

IF 2.3 4区 材料科学 Q2 Chemistry
Manuel Ratz, Domenico Fiorini, Alessia Simonini, Christian Cierpka, Miguel A. Mendez
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引用次数: 3

Abstract

We investigate the interface dynamics in an unsteady quasi-capillary channel flow. The configuration consists of a liquid column that moves along a vertical 2D channel, open to the atmosphere and driven by a controlled pressure head. Both advancing and receding contact lines were analyzed to test the validity of classic models for dynamic wetting and to study the flow field near the interface. The operating conditions are characterized by a large acceleration, thus dominated by inertia. The shape of the moving meniscus was retrieved using Laser-Induced Fluorescence-based image processing, while the flow field near was analyzed via Time-Resolved Particle Image Velocimetry (TR-PIV). The TR-PIV measurements were enhanced in the post-processing, using a combination of Proper Orthogonal Decomposition and Radial Basis Functions to achieve super-resolution of the velocity field. Large counter-rotating vortices were observed, and their evolution was monitored in terms of the maximum intensity of the Q-field. The results show that classic contact angle models based on interface velocity cannot describe the evolution of the contact angle at a macroscopic scale. Moreover, the impact of the interface dynamics on the flow field is considerable and extends to several capillary lengths below the interface.

Abstract Image

非定常准毛细通道流动的时间分辨PIV和基于rbf的超分辨分析
研究了非定常准毛细通道流动的界面动力学。该结构由一个沿垂直二维通道移动的液体柱组成,该通道向大气开放,由一个可控的压头驱动。分析了前进和后退接触线,验证了经典模型的有效性,并研究了界面附近的流场。工作条件的特点是大加速度,因此主要是惯性。利用基于激光诱导荧光的图像处理技术获取运动半月板的形状,同时利用时间分辨粒子图像测速技术(TR-PIV)分析运动半月板附近的流场。在后期处理中,利用适当的正交分解和径向基函数相结合的方法增强了TR-PIV测量结果,实现了速度场的超分辨率。观察到大的反向旋转涡,并根据最大q场强度监测其演变。结果表明,基于界面速度的经典接触角模型不能在宏观尺度上描述接触角的演变。此外,界面动力学对流场的影响是相当大的,并延伸到界面以下的几个毛细长度。
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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
4.40
自引率
8.70%
发文量
0
期刊介绍: Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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