{"title":"三周期最小表面 (TPMS) 超疏水性质的数值研究:水滴撞击、扩散和反弹现象的能量特征","authors":"Ahmed Islam, Rafiqul Islam","doi":"10.1007/s40997-024-00801-x","DOIUrl":null,"url":null,"abstract":"<p>The impact and rebound dynamics of water droplets on surfaces featuring triply periodic minimal surfaces (TPMS) are examined, investigated, and compared against flat and solid substrates in this numerical study. Water droplets’ collision, spreading, retraction and ability to jump off from TPMS surfaces are evaluated using kinetic energy analysis. Two types of geometry, cuboid and cylindrical, in the form of four distinct types of triply periodic minimal surfaces are generated as porous substrates to study their ability for water repellency. At high contact angles, the droplets’ kinetic energy profiles are found to be considerably higher than the flat substrates, at low impact velocity/Weber numbers. At smaller contact angles, the difference between the kinetic energy profiles is considerably higher for TPMS surfaces compared to flat substrates. Thus, droplets on periodic porous substrates are able to jump off such surfaces while failing to detach from a purely flat surface. At the same time, higher speed impacts at the smaller contact angles result in droplets failure to jump off on certain TPMS substrates, and could be attributed to excessive impalement characteristics that are not present with the other three types of substrates. For the cylindrical substrates, a similar observation has been made, where at lower contact angles, the droplets fail to jump off the solid substrate but repellency occurs on the TPMS substrates. The variation of the radial ratios of the substrates is also presented to elucidate the different characteristics of TPMS substrates at the end of the study.</p>","PeriodicalId":49063,"journal":{"name":"Iranian Journal of Science and Technology-Transactions of Mechanical Engineering","volume":"5 1","pages":""},"PeriodicalIF":1.5000,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Numerical Study of the Superhydrophobic Nature of Triply Periodic Minimal Surfaces (TPMS): Energy Characteristics of Droplet Impact, Spreading and Rebounding Phenomena\",\"authors\":\"Ahmed Islam, Rafiqul Islam\",\"doi\":\"10.1007/s40997-024-00801-x\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The impact and rebound dynamics of water droplets on surfaces featuring triply periodic minimal surfaces (TPMS) are examined, investigated, and compared against flat and solid substrates in this numerical study. Water droplets’ collision, spreading, retraction and ability to jump off from TPMS surfaces are evaluated using kinetic energy analysis. Two types of geometry, cuboid and cylindrical, in the form of four distinct types of triply periodic minimal surfaces are generated as porous substrates to study their ability for water repellency. At high contact angles, the droplets’ kinetic energy profiles are found to be considerably higher than the flat substrates, at low impact velocity/Weber numbers. At smaller contact angles, the difference between the kinetic energy profiles is considerably higher for TPMS surfaces compared to flat substrates. Thus, droplets on periodic porous substrates are able to jump off such surfaces while failing to detach from a purely flat surface. At the same time, higher speed impacts at the smaller contact angles result in droplets failure to jump off on certain TPMS substrates, and could be attributed to excessive impalement characteristics that are not present with the other three types of substrates. For the cylindrical substrates, a similar observation has been made, where at lower contact angles, the droplets fail to jump off the solid substrate but repellency occurs on the TPMS substrates. The variation of the radial ratios of the substrates is also presented to elucidate the different characteristics of TPMS substrates at the end of the study.</p>\",\"PeriodicalId\":49063,\"journal\":{\"name\":\"Iranian Journal of Science and Technology-Transactions of Mechanical Engineering\",\"volume\":\"5 1\",\"pages\":\"\"},\"PeriodicalIF\":1.5000,\"publicationDate\":\"2024-09-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Iranian Journal of Science and Technology-Transactions of Mechanical Engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1007/s40997-024-00801-x\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Iranian Journal of Science and Technology-Transactions of Mechanical Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s40997-024-00801-x","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Numerical Study of the Superhydrophobic Nature of Triply Periodic Minimal Surfaces (TPMS): Energy Characteristics of Droplet Impact, Spreading and Rebounding Phenomena
The impact and rebound dynamics of water droplets on surfaces featuring triply periodic minimal surfaces (TPMS) are examined, investigated, and compared against flat and solid substrates in this numerical study. Water droplets’ collision, spreading, retraction and ability to jump off from TPMS surfaces are evaluated using kinetic energy analysis. Two types of geometry, cuboid and cylindrical, in the form of four distinct types of triply periodic minimal surfaces are generated as porous substrates to study their ability for water repellency. At high contact angles, the droplets’ kinetic energy profiles are found to be considerably higher than the flat substrates, at low impact velocity/Weber numbers. At smaller contact angles, the difference between the kinetic energy profiles is considerably higher for TPMS surfaces compared to flat substrates. Thus, droplets on periodic porous substrates are able to jump off such surfaces while failing to detach from a purely flat surface. At the same time, higher speed impacts at the smaller contact angles result in droplets failure to jump off on certain TPMS substrates, and could be attributed to excessive impalement characteristics that are not present with the other three types of substrates. For the cylindrical substrates, a similar observation has been made, where at lower contact angles, the droplets fail to jump off the solid substrate but repellency occurs on the TPMS substrates. The variation of the radial ratios of the substrates is also presented to elucidate the different characteristics of TPMS substrates at the end of the study.
期刊介绍:
Transactions of Mechanical Engineering is to foster the growth of scientific research in all branches of mechanical engineering and its related grounds and to provide a medium by means of which the fruits of these researches may be brought to the attentionof the world’s scientific communities. The journal has the focus on the frontier topics in the theoretical, mathematical, numerical, experimental and scientific developments in mechanical engineering as well
as applications of established techniques to new domains in various mechanical engineering disciplines such as: Solid Mechanics, Kinematics, Dynamics Vibration and Control, Fluids Mechanics, Thermodynamics and Heat Transfer, Energy and Environment, Computational Mechanics, Bio Micro and Nano Mechanics and Design and Materials Engineering & Manufacturing.
The editors will welcome papers from all professors and researchers from universities, research centers,
organizations, companies and industries from all over the world in the hope that this will advance the scientific standards of the journal and provide a channel of communication between Iranian Scholars and their colleague in other parts of the world.