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<p>To explore the potential performance of Venturi in the field of bubble generation, the effect of gas injection location on the bubble generation performance was investigated. This study aims to utilise the liquid kinetic energy to minimise the bubble size. Compared to the gas injection before converging region, the gas injection at the throat exhibits smaller bubble size with the gas-to-liquid ratio (GLR) ranging from 0.01 to 0.08. The bubble size with the gas injection at the throat at GLR of 0.01 is about 0.05 ~ 0.6mm. An improved Venturi bubble generator with gas injection in the divergent region has a smaller bubble size when the GLR exceeds 4.3. The bubble size with the gas injection in the divergent region at GLR of 24 is about 3.7 mm while the bubble size with the gas injection at the throat exhibits 8&#xa0;mm. For small GLR, gas injection location was recommended at the throat to improve bubble generation frequency. For large GLR, gas injection location was recommended in the divergent region to achieve less bubble coalescence. This study provides the valuable insights for advancing bubble generation technologies and the design guidelines for Venturi bubble generators.</p>

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Effect of gas injection location on bubble size from Venturi bubble generators

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Siyi Li,
  • Xiang Liu,
  • Jiajun Yang,
  • Jinghao Bi,
  • Xiao Xu,
  • Qiang Yang

摘要

To explore the potential performance of Venturi in the field of bubble generation, the effect of gas injection location on the bubble generation performance was investigated. This study aims to utilise the liquid kinetic energy to minimise the bubble size. Compared to the gas injection before converging region, the gas injection at the throat exhibits smaller bubble size with the gas-to-liquid ratio (GLR) ranging from 0.01 to 0.08. The bubble size with the gas injection at the throat at GLR of 0.01 is about 0.05 ~ 0.6mm. An improved Venturi bubble generator with gas injection in the divergent region has a smaller bubble size when the GLR exceeds 4.3. The bubble size with the gas injection in the divergent region at GLR of 24 is about 3.7 mm while the bubble size with the gas injection at the throat exhibits 8 mm. For small GLR, gas injection location was recommended at the throat to improve bubble generation frequency. For large GLR, gas injection location was recommended in the divergent region to achieve less bubble coalescence. This study provides the valuable insights for advancing bubble generation technologies and the design guidelines for Venturi bubble generators.