{"title":"Impinging hollow droplet of glycerin in spray coating influence of mutable obstacle and dynamic contact angle","authors":"Hossein Sayyari, M. Peiravi, J. Alinejad","doi":"10.1088/1873-7005/ac6690","DOIUrl":null,"url":null,"abstract":"In this study, droplet impact on a solid surface with obstacles occurring in many technological processes was numerically analyzed. The simulation of the hollow droplet impact on to solid surface used the volume of fluid method. A hollow droplet consists of a liquid shell enclosing an air cavity. The hollow droplet impact onto the surface has an obstacle with a different ratio of D/h and diameter of obstacle at three different speeds. It is found that the obstacle made dual jet in some cases. The length of the counter jet decreased with increased the dimension of the obstacle that the maximum and minimum length of the jet is been in case 1 at impact velocity 10 m s−1 and case 3 in V = 5 m s−1. Spread factor (f) increased 34.61% and 44.31% when impact velocity changed 1 m s−1–5 m s−1 and 10 m s−1 respectively.","PeriodicalId":56311,"journal":{"name":"Fluid Dynamics Research","volume":" ","pages":""},"PeriodicalIF":1.3000,"publicationDate":"2022-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fluid Dynamics Research","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1088/1873-7005/ac6690","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MECHANICS","Score":null,"Total":0}
引用次数: 5
Abstract
In this study, droplet impact on a solid surface with obstacles occurring in many technological processes was numerically analyzed. The simulation of the hollow droplet impact on to solid surface used the volume of fluid method. A hollow droplet consists of a liquid shell enclosing an air cavity. The hollow droplet impact onto the surface has an obstacle with a different ratio of D/h and diameter of obstacle at three different speeds. It is found that the obstacle made dual jet in some cases. The length of the counter jet decreased with increased the dimension of the obstacle that the maximum and minimum length of the jet is been in case 1 at impact velocity 10 m s−1 and case 3 in V = 5 m s−1. Spread factor (f) increased 34.61% and 44.31% when impact velocity changed 1 m s−1–5 m s−1 and 10 m s−1 respectively.
在本研究中，数值分析了在许多工艺过程中液滴对有障碍物的固体表面的撞击。采用流体体积法模拟空心液滴对固体表面的冲击。一个中空的液滴由一个包裹着空腔的液体外壳组成。在三种不同的速度下，空心液滴撞击表面形成了D/h比和直径不同的障碍物。研究发现，在某些情况下，障碍物会产生双射流。反射流长度随障碍物尺寸的增大而减小，在冲击速度为10 m s−1时，情形1的射流长度最大，最小;在V = 5 m s−1时，情形3的射流长度最小。当冲击速度变化1 m s−1 ~ 5 m s−1和10 m s−1时，扩散系数(f)分别增大34.61%和44.31%。
期刊介绍：
Fluid Dynamics Research publishes original and creative works in all fields of fluid dynamics. The scope includes theoretical, numerical and experimental studies that contribute to the fundamental understanding and/or application of fluid phenomena.
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