Effect of loaded carbon-based nanoparticles on the evaporation dynamics of sessile droplets

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2024-11-15 DOI:10.1016/j.ijthermalsci.2024.109549

Zhihao Zhang, Yuying Yan

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引用次数: 0

Abstract

Droplet evaporation is an essential physical process in industrial fields such as spray cooling and inkjet printing. With the widespread use of carbon materials, carbon-based nanofluid droplets have great potential to improve the efficiency and quality of applications in these fields. Therefore, understanding the effects of materials and external factors on the carbon-based nanofluid droplets evaporation dynamics becomes crucial. In this experimental study, the nanofluid droplets were prepared based on two common carbon-based nanomaterials, multi-walled carbon nanotubes (MWCNTs) and multi-layer graphene (MLG). The monocrystalline silicon wafer is used as the substrate, and the substrate temperature is controlled between 50 °C and 80 °C. Using the DI water droplets as a comparison, the effects of loading different carbon-based nanoparticles on wettability, evaporation modes, and heat transfer processes at the liquid-vapour interface were explored. The experimental results show that droplets loaded with MLG nanoparticles and sodium dodecyl sulfate (SDS) have the best evaporation efficiency, which can be improved by up to about 2.1 times compared with DI water. Furthermore, compared with the variable evaporation mode of the DI water droplets, the evaporation process of MLG nanofluid droplets is dominated by constant contact radius mode. At the same time, compared with DI water and MWCNTs, loaded MLG can reduce the liquid-vapour interface temperature difference by up to 3.7 °C and 1.0 °C, respectively, which effectively suppresses the evaporative cooling effect. Besides, the experimental results about the sedimentary pattern showed that MWCNTs can suppress the coffee-ring effect more effectively than MLG. Under various conditions, MLG nanoparticles can make the sedimentary pattern have greater surface roughness, which is about 1.8 times higher on average compared with MWCNTs.

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负载碳基纳米粒子对无柄液滴蒸发动力学的影响

液滴蒸发是喷雾冷却和喷墨打印等工业领域必不可少的物理过程。随着碳材料的广泛应用，碳基纳米液滴在提高这些领域的应用效率和质量方面具有巨大潜力。因此，了解材料和外部因素对碳基纳米流体液滴蒸发动力学的影响变得至关重要。在本实验研究中，制备的纳米流体液滴基于两种常见的碳基纳米材料：多壁碳纳米管（MWCNTs）和多层石墨烯（MLG）。以单晶硅片为基底，基底温度控制在 50 °C 至 80 °C 之间。以去离子水液滴为对比，探讨了负载不同碳基纳米粒子对液气界面的润湿性、蒸发模式和传热过程的影响。实验结果表明，负载了 MLG 纳米粒子和十二烷基硫酸钠（SDS）的液滴具有最佳的蒸发效率，与去离子水相比，蒸发效率最高可提高约 2.1 倍。此外，与 DI 水液滴的可变蒸发模式相比，MLG 纳米流体液滴的蒸发过程以恒定的接触半径模式为主。同时，与去离子水和 MWCNTs 相比，负载 MLG 可使液气界面温差分别降低达 3.7 ℃ 和 1.0 ℃，从而有效抑制了蒸发冷却效应。此外，有关沉积模式的实验结果表明，MWCNTs 比 MLG 能更有效地抑制咖啡环效应。在各种条件下，MLG 纳米粒子能使沉积图案具有更大的表面粗糙度，平均约为 MWCNTs 的 1.8 倍。

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

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.