{"title":"润湿性梯度表面振动液滴的聚结特性","authors":"Feng Chen, Zhi-hai Jia, Yong Deng","doi":"10.1680/jsuin.23.00012","DOIUrl":null,"url":null,"abstract":"The coalescence characteristics of two vibrated droplets at a certain distance on a microstructured surface with gradient wettability are investigated by a high-speed camera in this work. The results show that the volume ratio of the two droplets has a significant effect on the vibration modes. With the change of the volume ratio, the droplet exhibits different vibration modes, such as the pumping mode (PM), the rocking mode (RM), or the pumping-rocking mixed mode (PRM). In addition, the coalescence time of the two droplets varies with the volume ratio. When the volume ratio is close to 1, the two vibrated droplets are in synchronous pumping mode (SPM) and the coalescence time is the shortest. When the volume ratio is far away from 1, the two droplets may show the rocking mode (RM), the asynchronous pumping mode (APM), or the pumping-rocking mixed mode (PRM). At this point, the coalescence time gets increased, especially for the small volume ratios. Finally, the movement characteristics of the three-phase contact lines are discussed, and a theoretical model is proposed to analyze the coalescence process. This work provides a new method to remove droplets rapidly, which is essential to enhance the heat transfer performance of dropwise condensation.","PeriodicalId":22032,"journal":{"name":"Surface Innovations","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Coalescence characteristics of vibrated drops on a wettability gradient surface\",\"authors\":\"Feng Chen, Zhi-hai Jia, Yong Deng\",\"doi\":\"10.1680/jsuin.23.00012\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The coalescence characteristics of two vibrated droplets at a certain distance on a microstructured surface with gradient wettability are investigated by a high-speed camera in this work. The results show that the volume ratio of the two droplets has a significant effect on the vibration modes. With the change of the volume ratio, the droplet exhibits different vibration modes, such as the pumping mode (PM), the rocking mode (RM), or the pumping-rocking mixed mode (PRM). In addition, the coalescence time of the two droplets varies with the volume ratio. When the volume ratio is close to 1, the two vibrated droplets are in synchronous pumping mode (SPM) and the coalescence time is the shortest. When the volume ratio is far away from 1, the two droplets may show the rocking mode (RM), the asynchronous pumping mode (APM), or the pumping-rocking mixed mode (PRM). At this point, the coalescence time gets increased, especially for the small volume ratios. Finally, the movement characteristics of the three-phase contact lines are discussed, and a theoretical model is proposed to analyze the coalescence process. This work provides a new method to remove droplets rapidly, which is essential to enhance the heat transfer performance of dropwise condensation.\",\"PeriodicalId\":22032,\"journal\":{\"name\":\"Surface Innovations\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.7000,\"publicationDate\":\"2023-05-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Surface Innovations\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1680/jsuin.23.00012\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Surface Innovations","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1680/jsuin.23.00012","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Coalescence characteristics of vibrated drops on a wettability gradient surface
The coalescence characteristics of two vibrated droplets at a certain distance on a microstructured surface with gradient wettability are investigated by a high-speed camera in this work. The results show that the volume ratio of the two droplets has a significant effect on the vibration modes. With the change of the volume ratio, the droplet exhibits different vibration modes, such as the pumping mode (PM), the rocking mode (RM), or the pumping-rocking mixed mode (PRM). In addition, the coalescence time of the two droplets varies with the volume ratio. When the volume ratio is close to 1, the two vibrated droplets are in synchronous pumping mode (SPM) and the coalescence time is the shortest. When the volume ratio is far away from 1, the two droplets may show the rocking mode (RM), the asynchronous pumping mode (APM), or the pumping-rocking mixed mode (PRM). At this point, the coalescence time gets increased, especially for the small volume ratios. Finally, the movement characteristics of the three-phase contact lines are discussed, and a theoretical model is proposed to analyze the coalescence process. This work provides a new method to remove droplets rapidly, which is essential to enhance the heat transfer performance of dropwise condensation.
Surface InnovationsCHEMISTRY, PHYSICALMATERIALS SCIENCE, COAT-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
5.80
自引率
22.90%
发文量
66
期刊介绍:
The material innovations on surfaces, combined with understanding and manipulation of physics and chemistry of functional surfaces and coatings, have exploded in the past decade at an incredibly rapid pace.
Superhydrophobicity, superhydrophlicity, self-cleaning, self-healing, anti-fouling, anti-bacterial, etc., have become important fundamental topics of surface science research community driven by curiosity of physics, chemistry, and biology of interaction phenomenon at surfaces and their enormous potential in practical applications. Materials having controlled-functionality surfaces and coatings are important to the manufacturing of new products for environmental control, liquid manipulation, nanotechnological advances, biomedical engineering, pharmacy, biotechnology, and many others, and are part of the most promising technological innovations of the twenty-first century.