Phase-separation behavior in a binary mixture fluid layer subjected to a vertical temperature gradient

Yuichiro Seki, Takahiro Okabe, Yoshihiro Oshida, Masaki Kobayashi, Takao Tsukada, Mitsunori Hozawa, Masaki Kubo

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13 Citations (Scopus)


The phase separation behavior in a layer of an isobutyric acid (IBA)-water binary mixture was observed from the bottom and side of the layer, where the layer was subjected to a vertical temperature gradient spanning the critical temperature. As a result, the following conclusions were obtained. (1) Patterns characterized by a polygonal cell including one droplet, similar to those observed by Assenheimer et al. (Physica A 208 (1994) 373), were formed in a relatively thick liquid layer, e.g., 3 mm thick, in a limited range of the temperature gradient, although the patterns ultimately disappeared. (2) The growth and extinction rates of the phase-separated droplets increased with ΔT/d, and increased particularly rapidly at high ΔT/d. (3) The formation of the pattern of polygonal cells each with a droplet is considered to be due to thermocapillary motion along the droplet. (4) The concentration-driven buoyancy convection affects the growth rate of the phase-separated droplets. (5) The extinction rate of the phase-separated droplets at the late stage is affected by the thermocapillary motion along the droplet surface.

Original languageEnglish
Pages (from-to)2685-2693
Number of pages9
JournalChemical Engineering Science
Issue number13
Publication statusPublished - 2004 Jul


  • Drop
  • Heat transfer
  • Hydrodynamics
  • Multiphase flow
  • Phase separation
  • Temperature gradient


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