Experimental investigation on droplet size in post-dryout region

IF 5.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Zihan Xia, Nikolai Rensch, Xu Cheng
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引用次数: 0

Abstract

Due to the limited availability of experimental data on droplet size in dispersed flow under post-dryout (PDO) conditions, and its critical role in accurately predicting PDO heat transfer, this study designs and conducts a visualization experiment to investigate droplet behavior in PDO regime. A square flow channel with a centrally positioned electrically heated tube is constructed, installing multiple observation windows on both side walls to provide optical access to the droplets. Experiments are conducted under heat fluxes exceeding the critical heat flux (CHF), ensuring the observation area within the PDO regime. Droplet motion in the vapor flow is recorded by the high-speed camera through transparent windows. The droplet size and their distributions are extracted and analyzed under various operating conditions. The obtained data are combined with literature datasets to evaluate existing droplet size correlations. The results show that current droplet size correlations do not accurately predict the data. Therefore, a new droplet size correlation based on the droplet Weber number is developed, demonstrating good predictive performance over a range of operating conditions.
干后区液滴粒径的实验研究
由于干燥后(PDO)条件下分散流动中液滴尺寸的实验数据有限,而液滴尺寸对于准确预测PDO传热的关键作用,本研究设计并进行了可视化实验来研究PDO状态下液滴的行为。一个方形的流道,中间有一个电加热管,在两侧的墙上安装了多个观察窗口,以提供对液滴的光学访问。实验在热通量超过临界热通量(CHF)的情况下进行,确保观测区域在PDO范围内。高速摄像机通过透明窗口记录蒸汽流中的液滴运动。在不同的操作条件下,提取并分析了液滴的大小和分布。将获得的数据与文献数据集相结合,以评估现有液滴大小的相关性。结果表明,目前的液滴大小相关性不能准确地预测数据。因此,开发了基于液滴韦伯数的新的液滴大小相关性,在一系列操作条件下显示出良好的预测性能。
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来源期刊
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
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