Contact angle measurements for automotive exterior water management

Contact angle measurements for automotive exterior water management
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汽车外部水管理的接触角测量

DOI:
10.1007/s00348-021-03219-2
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发表时间:
2021
影响因子:
2.4
通讯作者:
Hodgson G
Hodgson G
中科院分区:
工程技术3区
文献类型:
--
作者:
Hodgson G

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在许多应用中,例如,在汽车应用中,良好的可见性和外部传感器的性能是必不可少的,模拟固体表面上的流体流动是重要的。多相CFD模拟方法,如流体的水平集或耦合水平集体积,通常需要一个经过验证的动态接触角模型作为毛细管数的函数,以准确地解决近壁行为。本文探讨了一种实验方法,以确定一个合适的接触角模型,纯净水和污染的水在玻璃和油漆表面。将图像处理方法应用于所需表面的液滴下降平板样品的高分辨率数字图像,确定动态前进和后退接触角和毛细管数。Cox-Voinov,德Gennes和横井模型参数化的实验数据,横井模型被证明是最适合于这些表面/流体组合的滞后是显着的。实施横井模型的多相模拟证明了模拟与实验之间的邦德数具有良好的相关性。图形摘要
The simulation of fluid flow over solid surfaces is important in many applications, for example, in automotive applications where good visibility and the performance of external sensors are essential. Multiphase CFD simulation methods such as level set or coupled level set–volume of fluid typically require a validated dynamic contact angle model as a function of capillary number to accurately resolve the near wall behaviour. This paper explores an experimental approach to identify a suitable contact angle model for pure and contaminated water on glass and painted surfaces. Applying image processing methods to high-resolution digital images of droplets descending flat plate samples of the required surfaces, the dynamic advancing and receding contact angles and capillary number are determined. Cox–Voinov, de Gennes and Yokoi models are parameterised from the experimental data, and the Yokoi model is shown to be the most suited to these surface/fluid combinations where hysteresis is significant. A multiphase simulation implementing the Yokoi model demonstrates good correlation for the Bond number between simulation and experiment.Graphic abstract
DOI: 10.1016/j.jcp.2012.07.018
发表时间: 2012-02
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