An Experimental Study of Gas Holdup in Two-Phase Bubble Columns with Foaming Liquids

L. Z. Pino, M. M. Yépez, A. E. Sáez, G. De Drago

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Gas-liquid upward flow experiments have been performed in • two bubble columns of different diameters (0.10 and 0.29 m,) using air as gas phase and several liquids: water, aqueous solutions of ethanol and glycerine, kerosene, and a solution of a surfactant in kerosene. The main goal of the study is the analysis of foaming systems, including the comparison of their behavior with respect to non-foaming systems. The gas holdup was determined experimentally as a function of the gas and liquid superficial velocities in bubbling, churn-turbulent and foaming regimes. It was found that, for foaming systems, semi-batch operation enhances foam formation, yielding higher holdups than those obtained in continuous operation at very low liquid velocities. Opposite to what is observed in non-foaming systems, the liquid superficial velocity affects the gas holdup appreciably in foaming systems. An increase in column diameter results in a decrease in gas holdup for all the systems studied. In aqueous foaming systems, this trend is more drastic since foam is inhibited as the column diameter increases.

Original languageEnglish (US)
Pages (from-to)155-175
Number of pages21
JournalChemical Engineering Communications
Issue number1
StatePublished - Mar 1990


  • Bubble column
  • Foaming
  • Gas holdup

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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