E216 未発達領域における気液二相流のボイド率と気液界面積濃度分布に関する研究(OS9 熱・流動(計測・試験))

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In this paper, systematic distributions of void fraction and interfacial area concentration at the different axial positions along the flow direction in developing and fully developed region were measured by using double-sensor point electrode probe in upward gas-liquid two-phase flow through a vertical pipe (50mm i.d.). Besides two types of bubble generators were applied in this study: one is wall bubble-generation; the other is center bubble-generation. The distribution of interfacial area concentration was similar to those of the void fraction distribution. However, there were some differences of the peak position for the distribution between the void fraction and the interfacial area concentration. Based on both data, bubble diameters can be estimated and compared as spherical bubble. It revealed that the bubbles might be coalesced or broken up in the developing region of the flow. Such data would be useful for appropriate modeling of interfacial area transport.
一般社団法人日本機械学会の論文
2011-06-22