Research on phase change of vertical annular falling film heat transfer in tube at high liquid film Reynolds number

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2025-09-13 DOI:10.1016/j.ijheatmasstransfer.2025.127820

Liang Wang

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引用次数: 0

Abstract

The turbulent gas–liquid heat transfer process in inlet section of falling film heat transfer in tube is very severe. To research the effect of high Reynolds number (Re_l=1.81 × 10⁴∼4.23 × 10⁴) phase change heat transfer characteristics and mechanism of falling liquid film in the scrubbing cooling tube. Vertical falling film flow model of the scrubbing cooling tube is established. The influence of liquid film temperature, Re_l and gas phase temperature on gas–liquid two-phase phase change heat transfer effect is studied using User Defined Function (UDF) in FLUENT. The results show that outlet temperature of gas–liquid mixed fluid rises with the increase of the initial gas temperature, and the gas–liquid heat transfer effect is most intense at 0–0.1 m. When gas temperature is 673 K, the maximum heat transfer coefficient (HTC)is about 899 W/(m²·K).When liquid film inlet temperature rises, HTC decreases, and the maximum deviation between calculated data and experimental correlations is about 12.43 %. When the gas temperature is between 1173 K and 1573 K, the cross-sectional temperature and water vapor content inside the tube increase. The HTC between gas and liquid phases is directly proportional to the liquid film Re_l and the dimensionless temperature. The maximum deviation between the fitted curve value and the calculated value is 11 %, fitting degree R² = 0.98.

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高液膜雷诺数下管内垂直环形降膜传热相变研究

管内降膜换热入口段的气液湍流换热过程十分剧烈。研究高雷诺数（Rel=1.81 × 104 ~ 4.23 × 104）对擦洗冷却管相变换热特性的影响及液膜落膜机理。建立了洗涤冷却管垂直降膜流动模型。利用FLUENT中的用户定义函数（UDF）研究了液膜温度、Rel和气相温度对气液两相相变换热效果的影响。结果表明：气液混合流体出口温度随初始气体温度的升高而升高，在0 ~ 0.1 m处气液换热效果最强；当气体温度为673 K时，最大换热系数HTC约为899 W/（m2·K）。当液膜入口温度升高时，HTC减小，计算值与实验值的最大偏差约为12.43%。当气体温度在1173 ~ 1573 K之间时，管内截面温度和水蒸气含量增加。气、液相之间的HTC与液膜的Rel和无量纲温度成正比。拟合曲线值与计算值的最大偏差为11%，拟合度R2 = 0.98。

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 Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

期刊介绍： International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer