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Terminal Effect of Drop Coalescence on Single Drop Mass Transfer Measurements and Its
Minimization

LI Tianwen; MAO Zaisha; CHEN Jiayong; FEI Weiyang   

  1. a Institute of Chemical Metallurgy, Chinese Academy of Sciences, Beijing 100080, China
    b State Key United Laboratory of Chemical Engineering, Tsinghua University, Beijing 100084,
    China
  • Received:1900-01-01 Revised:1900-01-01 Online:2001-06-28 Published:2001-06-28

液滴凝并端效应对单液滴传质测定的影响及消除

李天文; 毛在砂; 陈家镛   

  1. a Institute of Chemical Metallurgy, Chinese Academy of Sciences, Beijing 100080, China
    b State Key United Laboratory of Chemical Engineering, Tsinghua University, Beijing 100084,
    China
  • 通讯作者: 李天文

Abstract: For the mass transfer to single drops during the stage of steady buoyancy-driven motion,
experimental measurement is complicated with the terminal effect of additional mass transfer
during drop formation and coa lescence at the drop collector. Analysis reveals that
consistent operating conditions and experimental procedure are of critical significance for
minimizing the terminal effect of drop coalescence on the accuracy of mass transfer
measurements. The novel design of a totally-closed extraction column is proposed for this
purpose, which guaran tees that the volumetric rate of drop phase injection is exactly equal
to that of withdrawal of drops. Tests in two extraction systems demonstrate that the
experimental repeatability is improved greatly and the terminal effect of mass transfer
during drop coalescence is brought well under control.

Key words: solvent extraction, mass transfer, single drop, terminal effect, drop coalescence

摘要: For the mass transfer to single drops during the stage of steady buoyancy-driven motion,
experimental measurement is complicated with the terminal effect of additional mass transfer
during drop formation and coa lescence at the drop collector. Analysis reveals that
consistent operating conditions and experimental procedure are of critical significance for
minimizing the terminal effect of drop coalescence on the accuracy of mass transfer
measurements. The novel design of a totally-closed extraction column is proposed for this
purpose, which guaran tees that the volumetric rate of drop phase injection is exactly equal
to that of withdrawal of drops. Tests in two extraction systems demonstrate that the
experimental repeatability is improved greatly and the terminal effect of mass transfer
during drop coalescence is brought well under control.

关键词: solvent extraction;mass transfer;single drop;terminal effect;drop coalescence