Numerical study of local heat transfer characteristics of flow boiling in a vertical upward narrow rectangular channel

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-09-12 DOI:10.1016/j.ijthermalsci.2025.110300

Jian Cheng , Leren Tao , Cheng Jin , Zheming Cheng , Meng Li , Suhan Zhang , Wanying Chang

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Abstract

This paper presents a numerical investigation of flow boiling in a vertical upward narrow rectangular channel with heating on one side. The study utilizes a volume of fluid (VOF) model for interface tracking, coupled with a phase change Lee model to obtain the temperature, velocity and phase distribution in the channel. The dimensions of the channel are 1400 mm × 250 mm × 3 mm (Height × Width × Gap size), and the analysis is conducted at different heights. The local heat transfer coefficients (HTCs) are analyzed by varying the inlet temperature and mass flux. The findings indicate that increasing in the inlet temperature enhances the local heat transfer in the partially developed nucleation boiling region, but has less effect on the fully developed nucleation boiling region; increasing in the mass flux weakens the heat transfer in the initial region of nucleation boiling but enhances it for the region farther away from the nucleation sites. The flow boiling is divided into sub-regions with different flow patterns and heat transfer mechanisms corresponding to different regions, and the trends of flow patterns and heat transfer in different regions and the influencing factors are analyzed.

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垂直向上窄矩形通道内流动沸腾局部换热特性的数值研究

本文对单向加热的垂直向上窄矩形通道内的流动沸腾进行了数值研究。该研究利用流体体积（VOF）模型进行界面跟踪，并结合相变Lee模型获得通道内的温度、速度和相位分布。通道尺寸为1400mm × 250mm × 3mm（高×宽×间隙尺寸），在不同高度进行分析。通过改变进口温度和质量流量，分析了局部换热系数。结果表明：进口温度的升高促进了部分形核沸腾区局部换热，但对完全形核沸腾区影响较小；质量通量的增加削弱了初始成核沸腾区域的传热，而在远离成核位置的区域则增强了传热。将流动沸腾划分为不同区域对应不同流态和换热机理的子区域，分析了不同区域的流态和换热趋势及其影响因素。

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.