Wetting of Elastic Fibres: A Novel Immersed Boundary-Lattice Spring-Lattice Boltzmann Simulation Approach

弹性纤维的润湿：一种新颖的浸入式边界晶格弹簧晶格玻尔兹曼模拟方法

• 批准号: EP/P007139/1
• 负责人: Halim Kusumaatmaja
• 金额: $ 12.84万
• 依托单位: Durham University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FP007139%2F1
• 关键词: Wetting; Elastic; Fibres; Novel; Immersed

Fibrous structures are versatile materials. They are abundant in nature, as observed in feathers, hairs, spider webs and adhesive pads of insects. They are also widely exploited in engineered systems, from the familiar examples of papers and textiles to high-precision micro- and nano-technologies. For many fibrous materials, their interaction with liquids is of paramount importance. Due to the small size of the fibres, capillary action (as observed e.g. in the drawing up of liquids in plants) often plays the dominant role. Furthermore, the action of capillarity deforms the fibres, which results in an opposing force due to elasticity. This competition between elasticity and capillarity - elastocapillarity - finds its relevance in a wide range of applications, including liquid penetration in wipes and nappies, and the clumping of hairs in the tarsi of insects and of barbules in marine bird feathers.Despite the numerous industrial applications and common occurrence in nature, our understanding of elastocapillary response of wet fibres is still very limited. Recent experiments suggest that pattern formation in nanostructures can be manipulated by elastocapillary dynamics; the capture of drops and their splashing, of relevance to the application of pesticides or herbicides among others, depend on the fibre geometry and flexibility. These are just a few of many elastocapillary phenomena ripe for investigations, especially using computer simulations, since the intricate interplay between fibre geometry, elasticity and capillarity quickly makes analytical treatments intractable. Unfortunately, simulation methods that can capture solid deformation, flow of liquids, and capillary forces are currently not available. Thus, it is my aim in this project is to deliver a numerical platform able to tackle such a challenge. This project is rooted in my recent research advances in simulation techniques for wetting phenomena. As a proof of principle, to demonstrate that the novel method can capture wetting dynamics on soft materials, I will examine the spreading of small droplets on two elastic fibres oriented at various angles with respect to each other, and I will study the removal of these droplets under the action of a body force such as gravity. These are paradigmatic examples for understanding the arrangement and cleaning properties of natural and synthetic wet fibre assemblies.My new simulations will be validated against experimental data provided by Procter and Gamble, where wetting of elastic fibres is relevant for many of their products, ranging from adsorbent materials (including nappies and wipes) to personal hygiene products (e.g. shampoos and laundry detergents).If successful, my novel approach will open an unprecedented route to model static and dynamic elastocapillary phenomena embedded in complex geometries. As such, it will advance our understanding of elastocapillarity, and help channel fundamental scientific insights into design principles for practical applications.

纤维结构是多用途材料。它们在自然界中大量存在，如在羽毛，毛发，蜘蛛网和昆虫的粘性垫中观察到的。它们也被广泛应用于工程系统，从熟悉的纸张和纺织品到高精度的微米和纳米技术。对于许多纤维材料，它们与液体的相互作用是至关重要的。由于纤维的尺寸很小，毛细作用（例如在植物中吸取液体时观察到的）通常起主导作用。此外，毛细作用使纤维变形，这导致由于弹性而产生的相反力。这种弹性和毛细作用之间的竞争-弹性毛细作用-发现其在广泛的应用中的相关性，包括擦拭巾和尿布中的液体渗透，以及昆虫跗骨中的毛发和海鸟羽毛中的毛簇的聚集。尽管有许多工业应用和自然界中的常见情况，但我们对湿纤维的弹性毛细反应的理解仍然非常有限。最近的实验表明，纳米结构中的图案形成可以通过弹性毛细管动力学来操纵;与杀虫剂或除草剂等的应用相关的液滴的捕获及其飞溅取决于纤维的几何形状和柔性。这些只是许多弹性毛细现象中的一小部分，特别是使用计算机模拟进行研究，因为纤维几何形状，弹性和毛细作用之间的复杂相互作用很快使分析处理变得棘手。不幸的是，目前还没有能够捕捉固体变形、液体流动和毛细力的模拟方法。因此，我在这个项目中的目标是提供一个能够应对这种挑战的数字平台。这个项目是植根于我最近的研究进展，在模拟技术的润湿现象。作为原理的证明，为了证明新方法可以捕获软材料上的润湿动力学，我将研究小液滴在相对于彼此以各种角度取向的两个弹性纤维上的传播，并且我将研究在重力等体力的作用下去除这些液滴。这些是理解天然和合成湿纤维集合体的排列和清洁性能的典型例子。我的新模拟将根据宝洁公司提供的实验数据进行验证，其中弹性纤维的润湿与他们的许多产品有关，从吸附材料（包括尿布和湿巾）到个人卫生产品（例如洗发水和洗衣液）。如果成功，我的新方法将开辟一条前所未有的途径来模拟复杂几何形状中的静态和动态弹性毛细现象。因此，它将促进我们对弹性毛细现象的理解，并有助于将基本的科学见解引导到实际应用的设计原则中。

项目成果

Harnessing energy landscape exploration to control the buckling of cylindrical shells

• DOI: 10.1038/s42005-019-0251-4
• 发表时间: 2019-10
• 期刊: Communications Physics
• 影响因子: 5.5
• 作者: Jack R. Panter;Junbo Chen;Teng Zhang;H. Kusumaatmaja

Wetting of phase-separated droplets on plant vacuole membranes leads to a competition between tonoplast budding and nanotube formation.

• DOI: 10.1073/pnas.2024109118
• 发表时间: 2021-09-07
• 期刊: Proceedings of the National Academy of Sciences of the United States of America
• 影响因子: 11.1
• 作者: Kusumaatmaja H;May AI;Feeney M;McKenna JF;Mizushima N;Frigerio L;Knorr RL
• 通讯作者: Knorr RL

Multifaceted design optimisation for superomniphobic surfaces

超全疏表面的多方面设计优化

• DOI: 10.48550/arxiv.1904.05193
• 发表时间: 2019
• 作者: Panter J

Intracellular wetting mediates contacts between liquid compartments and membrane-bound organelles.

• DOI: 10.1083/jcb.202103175
• 发表时间: 2021-10-04
• 期刊: The Journal of cell biology
• 作者: Kusumaatmaja H;May AI;Knorr RL
• 通讯作者: Knorr RL

OpenLB-Open source lattice Boltzmann code

OpenLB-开源格子玻尔兹曼代码

• DOI: 10.1016/j.camwa.2020.04.033
• 发表时间: 2021
• 期刊: Computers & Mathematics with Applications
• 影响因子: 2.9
• 作者: Krause M