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<p>Existing research has extensively focused on the formation dynamics of single bubbles, while the formation characteristics and generation period of the second bubble following the first bubble have not yet been fully understood. This paper established a two-dimensional axisymmetric model based on OpenFOAM platform, and the Volume of Fluid (VOF) method was employed to capture the gas-liquid interface. It was conducted on the systematic numerical simulations of the first two bubbles generation in Newtonian liquids, shear-thinning liquids, and viscoelastic liquids. The morphological and size evolution of the at the pinch-off moment of the first bubble neck was analyzed, and the influence mechanism of the first bubble on the second bubble generation period is explored in depth. The present results show that liquid viscosity (or apparent viscosity) is the key factor determining the size of the second bubble, and the second bubble generation period is shorter than that of the first bubble in water and shear-thinning liquids. In viscoelastic liquids, the generation period of the second bubble is actually longer than that of the first bubble as the relaxation time increases. This finding will provide theoretical guidance for the precise control of multi-bubble sequences in non-Newtonian fluids and offer essential theoretical support and a numerical basis for optimizing gas-liquid mass transfer efficiency in related industrial processes.</p>

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Numerical investigation of liquid-phase rheological effects on the generation of the first two bubbles during gas injection from a submerged orifice

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Ziyi Yang,
  • Mingjun Pang

摘要

Existing research has extensively focused on the formation dynamics of single bubbles, while the formation characteristics and generation period of the second bubble following the first bubble have not yet been fully understood. This paper established a two-dimensional axisymmetric model based on OpenFOAM platform, and the Volume of Fluid (VOF) method was employed to capture the gas-liquid interface. It was conducted on the systematic numerical simulations of the first two bubbles generation in Newtonian liquids, shear-thinning liquids, and viscoelastic liquids. The morphological and size evolution of the at the pinch-off moment of the first bubble neck was analyzed, and the influence mechanism of the first bubble on the second bubble generation period is explored in depth. The present results show that liquid viscosity (or apparent viscosity) is the key factor determining the size of the second bubble, and the second bubble generation period is shorter than that of the first bubble in water and shear-thinning liquids. In viscoelastic liquids, the generation period of the second bubble is actually longer than that of the first bubble as the relaxation time increases. This finding will provide theoretical guidance for the precise control of multi-bubble sequences in non-Newtonian fluids and offer essential theoretical support and a numerical basis for optimizing gas-liquid mass transfer efficiency in related industrial processes.