Effect of wall wettability condition on drift-flux parameters in lead?bismuth two-phase flow in circular and annular bubble columns
Effect of wall wettability condition on drift-flux parameters in lead?bismuth two-phase flow in circular and annular bubble columns
复制标题
圆形和环形气泡塔内铅铋两相流壁润湿性条件对漂移通量参数的影响
DOI：
10.1080/00223131.2017.1394230
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发表时间：
2017
影响因子：
1.2
通讯作者：
Saito Yasushi
中科院分区：
文献类型：
--
作者：
Ariyoshi Gen;Inatomi Ryota;Ito Daisuke;Saito Yasushi
通过改变容器壁面润湿性，对铅铋两相在圆柱形容器和环形空间内的流动进行了实验研究。本研究中使用的试验段为圆柱形不锈钢容器，带/不带内套管以改变水力直径。体积平均空隙率通过改变测试部分的表面润湿性来测量，该润湿性通过使用助焊剂来增强。测量的空隙率进行了比较，现有的两相流的相关性和一维理论模拟假设一维漂移通量模型。从实验结果来看，无论表面润湿性如何，铅铋两相流的分布参数都比普通两相流的分布参数大得多。在本工作中，进行了一维分析的圆柱形容器再现的分布参数。从模拟结果来看，圆柱形容器的预测值与实验结果吻合较好。然而，在环空，环空的分布参数被低估，目前的模型。结果表明，在环空情况下，由于润湿性差，在内表面附近可能形成较陡的空隙率分布。
Lead–bismuth two-phase flow in a cylindrical vessel and annulus was experimentally investigated by varying the surface wettability of the vessel wall. The test section used in this study was a cylindrical stainless vessel with/without inner sleeve to change the hydraulic diameter. Volume-averaged void fraction was measured by varying the surface wettability of the test section, which was enhanced by using a soldering flux. Measured void fraction was compared with existing two-phase flow correlations and with one-dimensional theoretical simulations assuming one-dimensional drift-flux model. From experimental results, measured distribution parameters of the lead–bismuth two-phase flow are much larger than that of ordinary two-phase flow regardless of the surface wettability. In the present work, the one-dimensional analysis was carried out for the cylindrical vessel to reproduce the distribution parameter. From the simulation results, predicted value for the cylindrical vessel showed good agreement with experimental results. However, in annulus, the distribution parameters in annulus were underestimated by the present model. It was suggested that, in case of annulus, steeper void fraction profile might be formed near the inner surface for poor wettability condition.