Analysis of Deformation and Breakage During Bubble Collision

doi:10.19596/j.cnki.1001-246x.8363

Abstract

Abstract:

Gas-liquid two-phase flow is used to simulate double bubble collision process numerically with LES method, fluid volume method, crushing criterion and the third-generation vortex identification method. The single variable method is used to study the influence of bubble diameter ratio, relative eccentricity and relative distance between bubbles on the degree of bubble fragmentation. In the process of double bubble collision, the closer the diameter of the two bubbles is, the weaker the bubble breaking degree is. The relative eccentric distance has little effect on the bubble breaking degree. It shows that as the relative distance is less than 1, the bubble breaking degree is more obvious with the increase of the relative distance. As the relative distance is more than 1, the bubble breaking degree tends to be flat. It also shows that the third-generation vortex identification method captures the vortex position in the two-phase turbulent flow field well, and reflects sensitively the turbulent changes.

Key words: bubble, aspect ratio, reduction ratio, numerical simulation, the third-generation vortex identification

Tengfei ZHAO, Hua ZHANG. Analysis of Deformation and Breakage During Bubble Collision[J]. Chinese Journal of Computational Physics, 2022, 39(1): 41-52.

Figures/Tables 18

Fig.1 A schematic of vortex and bubble size in crushing process

Fig.2 A schematic of bubbles collision

Fig.3 Contrast of bubble shape fitting (a)experimental image; (b)fitting image

Fig.4 Contrast of single bubble ascending motion in still liquid at different moments(The upper row are images of experiment; The lower row are images of simulation.) (a) t=0.01 s; (b) t=0.1 s; (c) t=0.22 s

Table 1 Positive center collision calculation examples

算例序号	先导气泡直径/mm	尾随气泡直径/mm	直径比	相对距离ξ_z
1	2	8	0.25	0.75
2	4	8	0.5	0.75
3	6	8	0.75	0.75
4	8	8	1	0.75
5	8	6.4	1.25	0.75
6	8	5.3	1.5	0.75
7	8	4.57	1.75	0.75
8	8	4	2	0.75
9	8	3	2.67	0.75
10	8	3	2	0.25, 0.5, 0.75, 1

Fig.5 Shape evolution in rising process of positive center collision of two bubbles (a) t=0 s; (b) t=0.04 s; (c) t=0.05 s; (d) t=0.08 s; (e) t=0.09 s; (f) t=0.11 s; (g) t=0.12 s; (h) t=0.14s; (i) t=0.15 s; (j) t=0.16 s; (k) t=0.17 s; (l) t=0.19 s

Fig.6 Bubble motion in positive center collision at 0.11 second (a) gas phase and velocity vectors; (b) pressure and velocity vectors; (c) Liutex vector and velocity vectors

Fig.7 Evolution of aspect ratios before bubbles coalesce

Fig.8 Reduction ratio as a function of relative bubble distance

Fig.9 Evolution of aspect ratios as the diameter ratio is 0.25

Fig.10 Evolution of aspect ratio as the diameter ratio is 2

Fig.11 Velocity vectors and pressure cloud maps during bubble rising (a) velocity vectors at 0.09 s; (b) pressures at 0.09 s; (c) velocity vectos at 0.11 s; (d) pressures at 0.11 s

Fig.12 Crushing ratio as a function of diameter ratio

Fig.13 Shape evolution in rising process of eccentric collision of two bubbles (a) t=0 s; (b) t=0.04 s; (c) t=0.06 s; (d) t=0.09 s; (e) t=0.1 s; (f) t=0.11 s; (g) t=0.12 s; (h) t=0.13 s; (i) t=0.14 s; (g) t=0.16 s; (k) t=0.17 s; (l) t=0.19 s

Fig.14 Bubble motion in eccentric collision at 0.1 second (a) gasous phase and velocity vectors; (b) pressure and velocity vectors; (c) Liutex vectors and velocity vectors

Fig.15 Evolution of aspect ratio and major axis slope as relative eccentricity is 0.25

Fig.16 Evolution of aspect ratio and major axis slope as relative eccentricity is 0.75

Fig.17 Crushing ratio as a function of relative eccentricity

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