A non-intrusive probe for bubble profile and velocity measurement in horizontal slug flows

被引:28
作者
dos Reis, E [1 ]
Goldstein, L [1 ]
机构
[1] Univ Estadual Campinas, DETF, FEM, Sch Mech Engn, BR-13083970 Campinas, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
slug flow; capacitance probe; film profile; bubble velocity;
D O I
10.1016/j.flowmeasinst.2005.03.003
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A new technique was developed for measuring the profile and mean velocity of elongated bubbles in horizontal air-water slug flows. It is based on the capacitance between two thin electrodes mounted on the external surface of a dielectric pipe, and has advantages in relation to the traditional parallel wire technique, since it is not intrusive, the presence of impurities in the liquid phase has no influence on the probe response, and it is applicable to very low electrical conductivity liquids, such as oils and deionized water. Tests were performed in an experimental facility with a 5 m long, 34 mm internal diameter Plexiglas pipeline. The elongated bubble mean velocity was determined by using a cross correlation technique applied to the signals coming from two identical capacitance probes, mounted 50 mm distant from each other. The results were compared with an empirical correlation from the literature. Discordance was observed only for flows near the flow pattern transition regions in the flow pattern map. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:229 / 239
页数:11
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