Investigation on dynamic characteristics of droplet impact on surfaces with different rough microstructures based on lattice Boltzmann method

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2024-10-09 DOI:10.1016/j.csite.2024.105252

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引用次数: 0

Abstract

Constructing microstructures on smooth surfaces is significant for 3D printing technology and surface self-cleaning effects in engineering applications. This paper uses the lattice Boltzmann method (LBM) to study the droplet impact behavior on different microstructured surfaces: right-triangle, semicircular, and rectangular microstructures. The formulas for calculating the surface wetting characteristics of different microstructures are derived theoretically, the difference between simulation results and those from theoretical analyses is less than 5 %. The increase of the microstructure column height h may eventually lead to the disappearance of the Wenzel mode. The droplet impact on the microstructured hydrophilic surface can accelerate the droplet to the stable stage and reduce the excessive impact effect. The droplet impacts on the superhydrophobic microstructured surface can accelerate the rebound separation and shorten the time to reach the stable stage. When droplets impact the superhydrophobic surface of the right-triangle microstructure, a secondary separation phenomenon will occur, resulting in the maximum rebound height and the maximum reduction of the near-wall density. The superhydrophobic right-triangle microstructured surface can more effectively promote self-cleaning.

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基于晶格玻尔兹曼法研究液滴撞击不同粗糙微结构表面的动态特性

在光滑表面上构建微结构对于三维打印技术和工程应用中的表面自清洁效果意义重大。本文采用晶格玻尔兹曼法（LBM）研究了液滴在不同微结构表面（直角三角形、半圆形和矩形微结构）上的撞击行为。不同微结构表面润湿特性的计算公式是通过理论推导得出的，模拟结果与理论分析结果的差异小于 5%。微结构柱高 h 的增加可能最终导致温泽尔模式的消失。液滴撞击微结构亲水表面可加速液滴进入稳定阶段，减少过度撞击效应。液滴撞击超疏水微结构表面可加速反弹分离，缩短达到稳定阶段的时间。当液滴撞击直角三角形微结构的超疏水表面时，会发生二次分离现象，导致反弹高度最大，近壁密度降低最大。超疏水的直角三角形微结构表面能更有效地促进自清洁。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.