Size distributions and dynamic characteristics of droplets in gas–liquid annular flow

IF 2.1 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Design Pub Date : 2025-09-19 DOI:10.1016/j.nucengdes.2025.114482

Ri Zhang , Yuntao Hu , Zhen Yan

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引用次数: 0

Abstract

Droplet breakup and coalescence models are integrated into the previously developed thin liquid film method (TLFM) to investigate in detail the evolution of the droplet population and its dynamic behavior. Validation against experimental data demonstrates that the improved TLFM accurately predicts macroscopic parameters and effectively captures the microscopic dynamics of gas–liquid annular flow. During the evolution of droplet population, atomization and deposition dominate droplet generation and extinction, respectively. Breakup and coalescence primarily influence the variation in the number of small droplets. Due to a sorting and screening mechanism within the gas core, large droplets move at lower velocities near its periphery, while small droplets travel faster near the center. The droplet fluctuation velocities in the axial and transverse directions follow Gaussian distributions with a mean of zero, with the axial fluctuation velocity exhibiting significantly greater variance than those in the transverse directions.

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气液环流中液滴的粒径分布及动态特性

将液滴破碎和聚结模型集成到先前开发的薄液膜方法（TLFM）中，以详细研究液滴种群及其动态行为的演变。实验数据验证表明，改进的TLFM能够准确预测宏观参数，有效捕捉气液环空流动的微观动态。在液滴种群的演化过程中，雾化和沉积分别主导着液滴的产生和灭绝。破碎和聚并主要影响小液滴数量的变化。由于气芯内部的分选和筛选机制，大液滴在其外围以较低的速度移动，而小液滴在其中心附近以较快的速度移动。液滴在轴向和横向上的波动速度服从高斯分布，平均值为零，轴向波动速度的方差明显大于横向波动速度的方差。

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

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.