海水冷却剂饱和流沸腾实验中基于x射线成像的空隙率测量

IF 1.3 Q3 INSTRUMENTS & INSTRUMENTATION
S. Eckels, Zayed Ahmed, M. Ross, D. Franken, S. Eckels, H. Bindra
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引用次数: 0

摘要

最近的研究表明,水中溶解盐的存在会表现出独特的流动沸腾和两相流动状态。两相流和对流沸腾通常借助于空隙率测量来表征。为了定量地提高我们对海水冷却剂两相流和沸腾现象的理解,需要光学成像无法获得的空隙率数据。在本文中,我们提出了用X射线照相法测量自来水和海水饱和流沸腾的实验空隙率。最大能级为40keV的X射线用于对加热的测试部分的出口区域进行成像。在较低的热通量水平下,海水中的两相流是泡沫状的,本质上是均匀的,与自来水相比,产生了更高的空隙率。随着热通量的增加,流态类似于段塞流,空隙率测量接近于自来水。使用测量的空隙率预测的压降与整个测试段的测量总压降显示出良好的一致性,证明了测量过程的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
X-ray Imaging-Based Void Fraction Measurement in Saturated Flow Boiling Experiments with Seawater Coolant
Recent studies have shown that the presence of dissolved salts in water can exhibit peculiar flow boiling and two-phase flow regimes. Two-phase flow and convective flow boiling are typically characterized with the help of void fraction measurements. To quantitatively improve our understanding of two-phase flow and boiling phenomenon with seawater coolant, void fraction data are needed, which can not be obtained from optical imaging. In this paper, we present experimental void fraction measurements of saturated flow boiling of tap water and seawater using X-ray radiography. X-rays with a maximum energy level of 40 KeV were used for imaging the exit region of the heated test section. At lower heat flux levels, the two phase flow in seawater was bubbly and homogeneous in nature, resulting in higher void fractions as compared to tap water. With an increase in heat flux, the flow regime was similar to slug flow, and void fraction measurements approached similarity with tap water. The predicted pressure drop using the measured void faction shows good agreement with the measured total pressure drop across the test section, demonstrating the validity of the measurement process.
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来源期刊
CiteScore
2.80
自引率
28.60%
发文量
27
审稿时长
11 weeks
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