Longxiang Zhu , Li Liu , Luteng Zhang , Qiang Lian , Simiao Tang , Zaiyong Ma , Wan Sun , Liangming Pan
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引用次数: 0
Abstract
Understanding the bubble motion characteristics in the two-phase flow is crucial for mass, momentum, and heat transfer processes between gas and liquid phases in various engineering systems. Despite decades of studying the phenomenon of bubbles rising in quiescent water, there is no unified conclusion regarding the three-dimensional motion characteristics of bubbles larger than 3 mm, where bubbles exhibit zigzag or spiral trajectories with shape oscillations. Meanwhile, the zigzag and spiral motions are sustained by the induced additional lift caused by the wake vortices acting on the bubbles, however, the evolution of forces acting on the bubbles during the stable rising phase has not been further studied by considering the combined effects of forces. This paper presents experimental research on the three-dimensional motion characteristics of bubbles during the stable rising phase. The results show that the bubbles transition from ellipsoidal shape to irregular shapes as the diameter increases, and the trajectory of the bubbles changes from regular spiral motion to random motion coupled with straight lines, zigzags, and spiral. The motion of bubbles during the stable rising phase is influenced by the combined effects of buoyancy, drag, and induced lift by the wake vortex. Additionally, the aspect ratio and terminal velocity of the bubbles were investigated using empirical relationships and dimensionless numbers, Eotvos, Weber, and Tadaki number. It was found that using the Tadaki number to predict the aspect ratio yielded the most accurate results, with the experimental values well predicted by an empirical correlation.
期刊介绍：
Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field.
Please note the following:
1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy.
2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc.
3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.
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