THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Yutang Zhao

,

Xiaohui Zhang

,

Xinting Tong

,

Xiaolv Yu

,

Jing Luo

,

Yanxiong Fu

,

Hua Wang

online first only

The motion and wake characteristics of bottom blowing coaxial double bubbles

ABSTRACT
In the process of bottom blowing bath smelting, continuous bubbles are formed and rise in the melt after the bottom blowing gas is ejected. In order to reveal the motion behavior and wake characteristics of continuous bubbles formed during the injection process, the rising process of coaxial double bubbles is studied through numerical simulation, the velocity and deformation characteristics of coaxial double bubbles in the rising process are obtained. Based on the vortex identification reconstruction of the flow field, the characteristics of formation, evolution, and configuration of bubble wake are obtained. The results show that in terms of motion characteristics, the aspect ratio of the upper bubble is always less than 1, and lower bubble has a large span of change: The minimum is 0.85 and the maximum is 1.2. As the two bubbles approach, the aspect ratio of the upper bubble is always less than 1, while the maximum aspect ratio of the lower bubble can reach 1.2. In terms of wake characteristics, the vorticity on the upper bubble surface is larger. When the wake rotation centers of the upper and lower bubbles merge with each other, the instantaneous acceleration of the lower bubble reaches the maximum.
KEYWORDS
Bath smelting, Bubble motion behavior, Wake, numerical simulation, Vortex identification
PAPER SUBMITTED: 2023-12-08
PAPER REVISED: 2024-01-08
PAPER ACCEPTED: 2024-01-11
PUBLISHED ONLINE: 2024-04-14
DOI REFERENCE: https://doi.org/10.2298/TSCI231208092Z
REFERENCES
  1. Yang, K., et al., Identifying flow patterns in a narrow channel via feature extraction of conductivity measurements with a support vector machine, Int. J., Sensors., 23 (2023), pp.1907
  2. Wang, S., et al., Bubble dynamics and its applications, Int. J., Journal of Hydrodynamics, 30(2018), pp:975-991
  3. Miksis, M, J., et al., Rising bubbles, Int. J., Journal of Fluid Mechanics., 123(1982), 31 41
  4. Amirnia, S., et al., Continuous rise velocity of air bubbles in non Newtonian biopolymer solutions, Int. J., Chemical Engineering Science., 94(2013), pp.60 68
  5. Zhang, L., et al., Chaotic characterization of macromixing effect in a gas liquid stirring system using modified 0 1 test, Int. J., Can J Chem Eng., 100(2022), pp.261 275
  6. Raymond, F., et al., A numerical and experimental study of the terminal velocity and shape of bubbles in viscous liquids, Int. J., Chemical Engineering Science., 55(2000), pp.943 955
  7. Hu, B., et al., Numerical study on the influence of liquid viscosity ratio on the hydrodynamics of a single bubble in shear thinning liquid, Int. J., Applied Mathematical Modelling., 103(2022), pp. 122 140
  8. Gao, D., et al., Study of bubble behavior in high viscosity liquid in a pseudo 2D column using high speed imaging, Int. J., Chemical Engineering Science., 252 (2022), pp. 117532
  9. Mirsandi, H., et al., Numerical study on the interaction of two bubbles rising side by side in viscous liquids, Int. J., Chemical Engineering Journal., 410 (2020), pp.128257
  10. Dekée, D., et al., Bubble velocity and coalescence in viscoelastic liquids, Int. J., Chemical Engineering Science., 41(1986), pp.2273 2283
  11. Liu, J., et al., Numerical simulation of the interactions between three equal interval parallel bubbles rising in non Newtonian fluids, Int. J., Chemical Engineering Science., 93 (2013), pp. 55 66
  12. Kong, G., et al., Hydrodynamic interaction of bubbles rising side by side in viscous liquids, Int. J., Experiments in Fluids., 60 (2019), pp. 155
  13. Ramírez Muñoz, J., et al., Drag force on interacting spherical bubbles rising in line at large Reynolds number, Int. J., International Journal of Multiphase Flow., 37 (2011), pp.983 986
  14. Feng, J., et al., Behaviour and dynamics of two bubbles in conjunct condition in high viscosity liquids, Int. J., Canadian Journal of Chemical Engineering., 94 (2016), pp. 1583 1591
  15. Tian, Z., et al., Interaction of two in line bubbles of equal size rising in viscous liquid, Int. J., Chinese Journal of Chemical Engineering., 28 (2020), pp.54 62
  16. Vahabi, M., et al., Interaction of a pair of in line bubbles ascending in an Oldroyd B liquid: A numerical study, Int. J., European Journal of Mechanics B/Fluids., 85 (2021), pp. 413 429
  17. Narayanan, S., et al., Coalescence of two bubbles rising in line at low reynolds numbers, Int. J., Chemical Engineering Science., 29 (1974), pp. 2071 2082
  18. Li, M., et al., Experimental investigation of the behaviors of highly deformed bubbles produced by coaxial coalescence, Int. J., Experimental Thermal and Fluid Science, 117 (2020), pp. 110114
  19. Komasawa, I., et al., Wake behavior and its effect on interaction between spherical-cap bubbles, Int. J., Journal of Chemical Engineering of Japan., 13(1980), pp.103-109
  20. Cano-Lozano, J., et al., Wake instability of a fixed axisymmetric bubble of realistic shape, Int. J., International Journal of Multiphase Flow, 51 (2013), pp. 11-21
  21. Cano-Lozano, J., et al., Paths and wakes of deformable nearly spheroidal rising bubbles close to the transition to path instability Int. J., Physical Review Fluids., 1(2016), pp. 053604
  22. Zhang, J., et al., What happens to the vortex structures when the rising bubble transits from zigzag to spiral, Int. J., Journal of Fluid Mechanics., 828(2017), pp.353-373
  23. Sanada, T., et al., Motion and coalescence of a pair of bubbles rising side by side, Int. J., Chemical Engineering Science., 64(2009), pp. 2659-2671
  24. Chai, X., et al., Wake acceleration effect on spherical bubbles aligned in-line, Int. J., Progress in Nuclear Energy., 80(2015), pp.74-79
  25. Yan, H., et al., A single bubble rising in the vicinity of a vertical wall: A numerical study based on volume of fluid method, Int. J., Ocean Engineering., 263(2022), pp.112379
  26. Amirnia, S., et al., Continuous rise velocity of air bubbles in non-Newtonian biopolymer solutions, Int. J., Chemical Engineering Science., 94(2013), pp.60-68
  27. Liu, Z., et al., Study of bubble induced flow structure using PIV, Int. J., Chemical Engineering Science., 60(2005), pp.3537-3552
  28. Hunt, J., et al., Eddies, streams, and convergence zones in turbulent flows, Int. J., Studying Turbulence Using Numerical Simulation Databases-I1., 1988, pp.193
  29. Kong, G., et al. Oscillation dynamics of a bubble rising in viscous liquid, Int. J., Experiments in Fluids., 60(2019), pp.130
  30. Liu, C., et al. New omega vortex identification method, Int. J., Science China (Physics,Mechanics & Astronomy)., 59(2016), pp.62-70
PDF VERSION [DOWNLOAD]
The motion and wake characteristics of bottom blowing coaxial double bubbles