Study on droplet entrainment of high-viscosity falling liquid film

Jun Inumaru, Maromu Ohtaka, Hiroaki Watanabe

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1 Citation (Scopus)


An experimental study of counter-current annular two-phase flow of high-viscosity liquid and air in a large diameter pipe was carried out to investigate the inception criterion for entrainment of molten slag droplet in an entrained flow coal gasifier. Liquid film thickness was measured using a high-speed camera for 4 types of liquid with various viscosities and surface tensions. It was clearly shown that the measured average wave amplitude had a good correlation with the gas Reynolds number, and that the predicted critical gas velocity for droplet inception using new formula of wave amplitude had a good agreement with the experimental results under the condition of very low fluid Reynolds number (Ref≦10). The critical Weber number W ec = 1.73 was obtained as inception criterion of droplet entrainment.

Original languageEnglish
Pages (from-to)2279-2286
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number11
Publication statusPublished - Nov 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering


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