Thermal Marangoni convection patterns and heat transfer characteristics in evaporating pendant droplets

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2026-05-01 Epub Date: 2026-01-05 DOI:10.1016/j.ijthermalsci.2025.110655

Jun-Meng Hou, Wan-Yuan Shi

引用次数: 0

Abstract

Pendant droplets widely exit in various engineering technologies such as spray cooling and medical diagnostics whereas thermal Marangoni convection in pendant droplets is lack of clearly understanding. The present paper aims to the dynamic behaviors and heat transfer characteristics of thermal Marangoni convection in pendant droplets during evaporation. The results found that three types of Marangoni convection patterns successively occurred in droplet with evaporation, i.e., they were unsteady thermocapillary convection, longitudinal rolls, and BM convection. Their surface temperature patterns and internal flow fields were carefully analyzed and the critical conditions for incipience of Marangoni convection instabilities were determined. Their Nusselt numbers and evaporation rates were measured and the influences of substrate temperature on them were investigated. These findings will be helpful for realizing Marangoni convection instabilities of pendant droplets.

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蒸发垂坠液滴的热马兰戈尼对流模式和传热特性

悬垂液滴广泛存在于喷雾冷却、医学诊断等工程技术中，而悬垂液滴中的马兰戈尼热对流却缺乏明确的认识。本文研究了悬垂液滴蒸发过程中马兰戈尼热对流的动力学行为和传热特性。结果发现，液滴蒸发过程中先后出现了三种类型的Marangoni对流，即非定常热毛细对流、纵向涡旋对流和BM对流。仔细分析了它们的表面温度分布和内部流场，确定了马兰戈尼对流不稳定发生的临界条件。测定了它们的努塞尔数和蒸发速率，并研究了衬底温度对它们的影响。这些研究结果将有助于实现悬垂液滴的马兰戈尼对流不稳定性。

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.