A new correlation and the review of two-phase flow pressure change across sudden expansion in small channels
A new correlation and the review of two-phase flow pressure change across sudden expansion in small channels
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DOI：
10.1016/j.ijheatmasstransfer.2010.05.057
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发表时间：
2010-09
影响因子：
5.2
通讯作者：
Chi-Chuan Wang;Chih-Yung Tseng;I. Chen
中科院分区：
文献类型：
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作者：
Chi-Chuan Wang;Chih-Yung Tseng;I. Chen
在这项研究中，作者首先提出了一个简短的概述单相流突然膨胀，其次是一个全面的回顾了两相流突然膨胀的相关文献，并检查现有的关联式的适用性。此外，从五个出版物中收集了282个数据。结果发现，没有一个现有的相关性可以准确地预测整个数据库。大多数的相关性高度预测的数据与一个小的测试部分，其中具有一个邦德数小于0.1，其中表面张力的影响占主导地位。此外，对于非常大的测试部分，一些相关性显著低于预测数据。在所研究的模型/相关性中，均质模型的预测能力较差，但它在工程方面是方便的。在此基础上，考虑Bond数、Weber数、Froude数、液体雷诺数、气体质量和面积比等因素对均相模型的影响，提出了一种改进的均相模型，该模型对所有数据的预测能力较现有的关联式有了很大的提高，平均偏差为23%，标准偏差为29%，适用于更宽的操作参数范围。
In this study, the authors first present a short overview on the single-phase flow across sudden expansion, followed by a thorough review of the relevant literature for two-phase flow across sudden expansion, and examination of the applicability of the existing correlations. Also, 282 data available from five publications are collected. It is found that none of the existing correlations can accurately predict the entire database. Most of the correlations highly over predict the data with a mini test section which has a Bond number being less than 0.1 in which the effect of surface tension dominates. Also, some of the correlations significantly under predict the data for very large test sections. Among the models/correlations being examined, the homogeneous model shows a poor predictive ability than the others, but it is handy for the engineering aspect. Hence by taking account the influences of Bond number, Weber number, Froude number, liquid Reynolds number, gas quality and area ratio into the original homogeneous model, a modified homogeneous model is proposed that considerably improves the predictive ability over existing correlations with a mean deviation of 23% and a standard deviation of 29% to all the data with wider ranges of operating parameters for application.