JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Online ISSN : 1881-1299
Print ISSN : 0021-9592
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55 巻, 11 号
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Editorial Note
Transport Phenomena and Fluid Engineering
  • Numerical Simulation Study of the Effect of Liquid Depth on the Stability of Thermal Marangoni Convection in a Shallow Cavity
    Neranjan Nayanajith Weerakoon Rathnayake, Radeesha Laknath Agampodi Me ...
    原稿種別: Research Paper
    2022 年 55 巻 11 号 p. 337-343
    発行日: 2022/11/20
    公開日: 2022/11/20
    DOIhttps://doi.org/10.1252/jcej.22we047
    ジャーナル 認証あり
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    The effect of liquid depth on thermal Marangoni convection stability in a shallow cavity was investigated via three-dimensional (3D) numerical simulations. The liquid film in the cavity is silicone oil with a Prandtl number of 6.7. The cavity is subjected to perpendicular temperature gradients. The simulation results show that, for thinner films, a primary instability appears when the flow transits from a steady state to a 3D oscillatory pattern. In thicker films, a secondary instability appears when the flow changes from oscillatory to chaotic. The critical thermal Marangoni numbers (at which transitions occur) of thin films are higher than those of thicker films. The simulation results imply that the uniform steady flow behavior in thinner films can be utilized to a benefit in coating and thin film applications, while the chaotic flow behavior predicted in thicker films can be utilized to obtain better mixing in applications such as lubrication and mixing.

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Separation Engineerin
  • Partition of Amino Acids in Aqueous Two-Phase Systems Comprising Hydrophilic Organic Solvents and Salts
    Michiaki Matsumoto, Takehiro Sato, Asuka Wada, Yoshiro Tahara
    原稿種別: Short Communication
    2022 年 55 巻 11 号 p. 344-348
    発行日: 2022/11/20
    公開日: 2022/11/20
    DOIhttps://doi.org/10.1252/jcej.22we048
    ジャーナル 認証あり
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    An aqueous two-phase system (ATPS) comprising a hydrophilic organic solvent and inorganic salt is advantageous because of its high polarity, low viscosity, and low cost. In this work, nine amino acids were partitioned in an ATPS that comprised hydrophilic organic solvents (2-methyl-2-propanol, tetrahydrofuran, and 2-propanol) and salts (Na2SO4, K2HPO4, and (NH4)2SO4). Amino acids were successfully extracted using different combinations of solvents and salts. The distribution ratio of amino acids in the ATPS containing ammonium sulfate increased with an increase in their hydrophobicity, except for that of alanine. The specific extraction of alanine was observed because of its salting-out effect in ammonium sulfate solution. The sulfate salts of amino acids exhibited higher extractability than amphoteric amino acids.

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