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Numerical Simulation of Multiple-Effect Diffusion Still with a Heated Upstream Surface and an Insulated Downstream Surface

DOI
  • NOSOKO Takehiro
    Mechanical Eng. Program, Faculty of Eng., University of the Ryukyus
  • KURUMADA Masaya
    Mechanical Eng. Program, Faculty of Eng., University of the Ryukyus
  • GIMA Satoru
    Mechanical Eng. Program, Faculty of Eng., University of the Ryukyus
  • MINAKUCHI Hisashi
    Mechanical Eng. Program, Faculty of Eng., University of the Ryukyus

Bibliographic Information

Other Title
  • 非加熱蒸留部を有する拡散式多重効用蒸留器の数値解析
  • ヒカネツ ジョウリュウブ オ ユウスル カクサンシキ タジュウ コウヨウ ジョウリュウキ ノ スウチ カイセキ

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Abstract

A multiple-effect diffusion still whose upstream surface was heated at 100 ℃ and downstream surface was insulated, was proposed to improve performance, and a steady-state two-dimensional analytical model was constructed for the still. The numerical analyses showed that solution and concentrate flowing down each effect increase in temperature and store heat in the heated region, and then decrease in temperature and release heat, causing additional distillation in the insulated region. The proposed 10-effect still increases the heat ratio(HR)of total evaporation to the supply for the still by 24 %, and the total evaporation rate per the length of the heated region by 50 %. However, the total evaporation rate per total length of the heated and insulated regions is decreased by 25 %. With an increase in the concentration ratio of the influent to effluent from 2 to 4, or in temperature of the influent from 30 ℃ to 60 ℃, the proposed still improves HR greatly.

Journal

Details

  • CRID
    1390282752326815488
  • NII Article ID
    130007708891
  • NII Book ID
    AN0018645X
  • DOI
    10.11457/swsj.72.2_109
  • ISSN
    21859213
    03694550
  • NDL BIB ID
    028968957
  • Text Lang
    ja
  • Data Source
    • JaLC
    • NDL
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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