Theoretical study of bubble departure and lift-off diameters model for evaporation based on microlayer in flow boiling

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Thermal Sciences Pub Date : 2025-08-01 Epub Date: 2025-04-08 DOI:10.1016/j.ijthermalsci.2025.109906

Wu-han Dong, Ming Gao, Zhong-xiang Shen, Meng-yuan Dang, Li-xin Zhang

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Abstract

This study was devoted to the theory of microlayer evaporation and bubble dynamics. In subcooled flowing boiling, a theoretical study of the mechanism of heat and mass transfer in vapor bubbles during boiling heat transfer has been carried out. The forces on mononuclear boiling bubbles during subcooled flow boiling are analyzed. In addition, the effect of microlayer evaporation was considered, and microlayer evaporation force has been introduced. Evaporation of the microlayers as between the bottom of a bubble and the heated wall, evaporation of the layer of superheated liquid around the bubble, the condensation of the vapors at the top of a bubble are taken into account on the basis of the bubble dynamics. The prediction models for bubble forces, departure and lift-off diameters were improved. The influence of force on the bubble under the same working conditions was also investigated. Compared with previous experimental results, it was found that the improved model could forecast the diameters of the bubble departure and bubble lift-off well.

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流动沸腾中基于微层的蒸发气泡离离直径模型的理论研究

本文主要研究了微层蒸发理论和气泡动力学。在过冷流动沸腾中，对沸腾传热过程中汽泡内的传热传质机理进行了理论研究。分析了过冷流动沸腾过程中单核沸腾气泡所受的作用力。此外，还考虑了微层蒸发的影响，并引入了微层蒸发力。在气泡动力学的基础上，考虑了气泡底部与加热壁面之间微层的蒸发、气泡周围过热液体层的蒸发以及气泡顶部蒸汽的冷凝。改进了气泡力、离体直径和离体直径的预测模型。在相同的工作条件下，还研究了力对气泡的影响。与以往的实验结果进行比较，发现改进后的模型能够较好地预测出气泡离井和气泡离井的直径。

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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.