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Visualization experimental research on the movement characteristics of bubbles escaping from twin-orifice wall HUANG Ying1, GAO Puzhen2, WANG Chaoqun1, and WANG Zhongyi1
1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory， Harbin Engineering University， Harbin， Heilongjiang, 150001，China (huangxiaopang@hrbeu.edu.cn)
2. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory， Harbin Engineering University， Harbin， Heilongjiang, 150001，China (gaopuzhen@sina.com)
Abstract:Themovement characteristics of bubbles escaping from twin-orifices wall were studied through visualization experiment. The rising trajectories, detachment size and velocity of two columns of bubbles were analyzed under the conditions of different orifice sizes and orificespacing. Besides, they were compared with single - orifice bubbles generation and movement characteristics, and the law of influence of the orifice sizes and orificespacing was obtained. According to the experimental results, when twocolumnsof bubbles rose side by side, they oscillatedhorizontally, showing a cycle process of getting close to each other -- getting away from each other -- and then getting close to each other.And the smaller the orifice spacing was, the larger amplitude the horizontal oscillation accompaniedby the rising of the bubbles was.Under the same orifice size and gas flow rate, the smaller the orificespacing was,the smaller bubble size at detachment, the lower the final stable velocity of the bubble. By contrast, under the same orifice spacing and gas flow rate, the larger the orifice size was, the larger bubble size at detachment was, the greater difference between the detachment size and single-orifice condition, and the higher final stable velocity of the bubble.
Keyword:bubble; two phase flow; visualization experiment; trajectory |
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