Volume and rate measurement of slowly generated gas bubbles

被引:5
作者
Abid, Hassan Ali [1 ]
Ong, Jian Wern [1 ]
Lin, Eric Shen [1 ]
Liew, Oi Wah [2 ]
Ng, Tuck Wah [1 ]
机构
[1] Monash Univ Clayton, Dept Mech & Aerosp Engn, Lab Opt & Appl Mech, Clayton, Vic 3800, Australia
[2] Natl Univ Singapore, Natl Univ Hlth Syst, Ctr Translat Med, Cardiovasc Res Inst,Yong Loo Lin Sch Med, 14 Med Dr, Singapore 117599, Singapore
关键词
Gas; Bubble; Inverted burette; Ray tracing; Binarization; CAPTIVE BUBBLES; AIR BUBBLES;
D O I
10.1016/j.flowmeasinst.2020.101694
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The use of an inverted burette arrangement that allowed volume and time-course tracking of bubble movement via camera imaging is shown here to improve on the classical inverted jar (or beaker) method for measuring gases generated in small volumes and at slow rates (below 1 mL/s). In tests involving discrete gas volume measurements delivered at 0.57 mL/s, comparison with pre-set air volume delivered by a syringe pump showed high correspondence, linearity, and repeatability. Tests with continuous gas flows at 0.2, 0.32 and 0.57 mL/s revealed average bubble count versus volume trends that displayed high linearity to indicate that the bubble volumes (at any flowrate) were constant. The average bubble count versus time also showed linear trends and repeatability indicating that the time intervals between the appearance of any two bubbles (at a particular flowrate) were uniform. The analytical and simulated results helped to explain why bubble size determination by high speed camera recording for measuring gas volume and flowrate is fraught with inherent problems. An analysis using light ray tracing showed that flowrate determination using such an approach would necessitate complicated image correction when two cameras are used for simultaneous recording due to distortion effects resulting from refraction. A virtual gate approach involving the binarization of images recorded with a standard camera is shown to be more feasible in establishing the flowrate using bubble counting or finding the time interval between bubbles.
引用
收藏
页数:8
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