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首页> 外文期刊>Quantum Beam Science >X-ray Imaging-Based Void Fraction Measurement in Saturated Flow Boiling Experiments with Seawater Coolant
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X-ray Imaging-Based Void Fraction Measurement in Saturated Flow Boiling Experiments with Seawater Coolant

机译：基于X射线成像的基于饱和流沸腾实验的空隙分数测量与海水冷却剂

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摘要

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.
机译：最近的研究表明，水中溶解盐的存在可以表现出特殊的流沸腾和两相流动制度。两相流和对流流沸腾通常在空隙级分测量的帮助下表征。为了定量改善我们对海水冷却剂的两相流和沸腾现象的理解，需要空隙率数据，这是不可从光学成像获得的。本文使用X射线射线照相术语呈现了自来水和海水饱和流沸腾的实验空隙分数测量。具有40keV的最大能级的X射线用于成像加热试验部分的出口区域。在较低的热量通量水平下，与自来水相比，海水中的两相流动是起泡和均匀的，导致级别更高。随着热通量的增加，流动状态类似于块状流动，空隙率测量与自来水接近相似度。使用测量的空隙派的预测压降显示了与测试部分的测量的总压降良好的一致性，证明了测量过程的有效性。

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