ホモジナイザーのバルブ形状と乳化作用  [in Japanese] The Shapes of Valves and Emulsification Action in a Homogenizer  [in Japanese]

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Abstract

圧力式乳化機は,安定した乳化が得られるため幅広い分野で利用されている.しかし,圧力式乳化機では,せん断・乱流・キャビテーションが同時に引き起こされ,乳化作用に対し重要度が高いものから,せん断・乱流・キャビテーションをランク付けすることは非常に難しい.圧力式乳化機の均質バルブ内の流れについて研究されているが,おもに圧力の違いで検討されており,依然として明らかにされていない部分がある.そこで,本研究では,小型の圧力式ホモジナイザーの均質バルブ形状を変更し,形状の違いによる影響について調査した.また,バルブ隙間の流れが放射状の層流であるとした計算式からバルブ隙間を算出し,均質バルブ内の圧力・せん断応力の代表値を導いた.さらにせん断応力の代表値による計算結果と実験による乳化後の粒子径を比較し,その代表値による乳化作用の整理式を提案できた.

The homogenizer basically consists of a high-pressure plunger pump usually with triple plungers to minimize pressure fluctuations and a homogenizing valve with a narrow gap. However, the flow within the homogenizing valve is not clarified theoretically. In this paper, the influence of shape modification of the homogenizing valve was investigated in the emulsification action. The experiments using a small homogenizer are conducted. We studied the influence of the flow pattern (pressure distributions, shear stress) on the droplet size distribution obtained in the experiment, and investigated the relation between the shear flow and the emulsification action in the homogenizing valve. In this experiment, two valve types (sharp type and flat type) were applied. The pressure drop in the valve and the parallel gap part length were changed. The droplet size distribution results obtained in the emulsification tests could be analyzed based on the average value of the wall shear stress in the parallel gap part through the above experiments and calculation results.

Journal

  • Japan Journal of Food Engineering

    Japan Journal of Food Engineering 10(4), 215-222, 2009

    Japan Society for Food Engineering

Codes

  • NII Article ID (NAID)
    130005084496
  • NII NACSIS-CAT ID (NCID)
    AA12076107
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • Journal Type
    大学紀要
  • ISSN
    1345-7942
  • NDL Article ID
    10527837
  • NDL Source Classification
    ZP34(科学技術--食品工学・工業)
  • NDL Call No.
    Z74-C69
  • Data Source
    NDL  IR  J-STAGE 
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