Experimental study on air-water countercurrent flow limitation in a vertical tube based on measurement of film thickness behavior

Jie Wan; Wan Sun; Jian Deng; Liang-ming Pan; Shu-hua Ding

doi:https://doi.org/10.1016/j.net.2020.12.019

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자료유형: 학술저널

저자정보: Jie Wan (Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Cho) Wan Sun (Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Cho) Jian Deng (Science and Technology on Reactor System Design Technology Laboratory, NPIC, Chengdu, 610041, PR Ch) Liang-ming Pan (Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Cho) Shu-hua Ding (Science and Technology on Reactor System Design Technology Laboratory, NPIC)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제53권 제6호

발행연도: 2021.6

수록면: 1,821 - 1,833 (13page)

DOI: https://doi.org/10.1016/j.net.2020.12.019

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The gas-liquid counter-current flow limitation (CCFL) is closely related to efficient and safety operation ofmany equipment in industrial cycle. Air-water countercurrent flow experiments were performed in atube with diameter of 25 mm to understand the triggering mechanism of CCFL. A parallel electrode probewas utilized to measure film thickness whereby the time domain and frequency domain characteristicsof liquid film was obtained. The amplitude of the interface wave is small at low liquid flow rate while itbecomes large at high liquid flow rate after being disturbed by the airflow. The spectral characteristiccurve shows a peak-shaped distribution. The crest exists between 0 and 10 Hz and the amplitude decreaseswith the frequency increase. The analysis of visual observation and characteristic of film thicknessindicate that two flooding mechanisms were identified at low and high liquid flow rate, respectively. At low liquid flow rate, the interfacial waves upward propagation is responsible for the formation of CCFLonset. While flooding at high liquid flow rate takes place as a direct consequence of the liquid bridging intube due to the turbulent flow pattern. Moreover, it is believed that there is a transition region betweenthe low and high liquid flow rate.

#Flooding #Interface wave #Film thickness #Experimental results

참고문헌 (24)

참고문헌 신청

O. L. Pushkina / 1969 / Breakdown of liquid film motion in vertical tubes / Heat Tran. Sov. Res 1:56~64

E.A. Dukler / 1977 / Two Phase Interactions in Counter-current Flow: Studies of the Flooding Mechanism

K. S. Chung / 1980 / Looding in two-phase counter-current flows-II : experimental investigation / Physico Chemical Hydrodynamics 1:209~220

D. M. Maron / 1981 / New concepts on the mechanisms of flooding and flow reversal phenomena / Lett. Heat Mass Tran 8(6):453~463

D. M. Maron / 1984 / Flooding and upward film flow in vertical tubesdII. Speculations on film flow mechanisms / Int. J. Multiphas. Flow 10(5):599~621

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이 논문의 저자 정보

Jie Wan

소속기관 Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Cho