Numerical study on heat and mass transfer of droplet collision on superheated bio-inspired surfaces

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2024-10-13 DOI:10.1016/j.ijthermalsci.2024.109476

Bowen Yu , Zhiguo Xu , Zhaolin Li , Jingxiang Wang

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Abstract

The velocity and temperature fields of droplet evaporation on bio-inspired surfaces are investigated based on the single-component multiphase pseudopotential lattice Boltzmann method and liquid-vapor phase-change model. The morphology of the surface is inspired by the hierarchical cuticle of springtails which have the feature of doubly reentrant pillars. The dynamic mechanism of droplet collision and evaporation is revealed in the study. The effects of Jakob number, solid thermal conductivity, and pillar spacing on the behavior of the droplet collision on superheated bio-inspired surfaces are statistically analyzed. The study provides detailed snapshots depicting the evolution of droplet morphology. The trends of substrate heat flux, droplet lifetime, and droplet volume with time are presented. For the doubly re-entrant superheated surface, the droplet is easier to split and the droplet lifetime is shorter compared to that on smooth substrates. The reduction ratio of droplet lifetime is 66.2 % when Jakob number equals 0.12. When Jakob number increases, Leidenfrost vapor layer is generated on the surface and it deteriorates droplet evaporation. The lifetime of droplets does not consistently decrease with increasing solid-liquid thermal conductivity ratio across different Jakob numbers, primarily due to variations in droplet morphology under different conditions. Moreover, an increase in pillar spacing leads to an enhancement in the evaporation rate under the same superheating conditions. The droplet lifetime of 20 pillar spacing is 58.72 % of 8 pillar spacing.

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过热生物启发表面上液滴碰撞的传热和传质数值研究

基于单组分多相伪势晶格玻尔兹曼法和液气相变模型，研究了液滴在生物启发表面上蒸发的速度场和温度场。表面形态的灵感来自于具有双重内倾柱特征的春蜱分层角质层。研究揭示了液滴碰撞和蒸发的动态机制。通过统计分析了雅各布数、固体热导率和柱间距对过热生物启发表面液滴碰撞行为的影响。研究提供了描绘液滴形态演变的详细快照。研究还给出了基底热通量、液滴寿命和液滴体积随时间变化的趋势。与光滑基底上的液滴相比，双重再入式过热表面上的液滴更容易分裂，液滴寿命更短。当 Jakob 数等于 0.12 时，液滴寿命的缩短率为 66.2%。当 Jakob 数增大时，表面会产生 Leidenfrost 蒸汽层，从而使液滴蒸发变差。在不同的雅各布数下，液滴的寿命并不会随着固液导热比的增加而持续缩短，这主要是由于在不同条件下液滴形态的变化。此外，在相同的过热条件下，柱间距的增加会导致蒸发率的提高。20 柱间距的液滴寿命是 8 柱间距的 58.72%。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.