The Influence of Impurities in a Water Solution with Drag Reducing Surfactants on the Flow Drag-Reduction and a Recovering Method of Its Decreased Drag Reduction Effect.

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  • NAKATA Toru
    Oppama Research Laboratories, Toho Chemical Industry Co. , Ltd.
  • SATO Kenji
    Oppama Research Laboratories, Toho Chemical Industry Co. , Ltd.
  • INABA Hideo
    Department of Mechanical Engineering, Okayama University
  • HORIBE Akihiko
    Department of Mechanical Engineering, Okayama University
  • HARUKI Naoto
    Department of Mechanical Engineering, Okayama University

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  • 界面活性剤による管内流動抵抗低減効果に及ぼす水中成分の影響および効果減少回復法
  • カイメン カッセイザイ ニ ヨル カン ナイ リュウドウ テイコウ テイゲン コウカ ニ オヨボス スイチュウ セイブン ノ エイキョウ オヨビ コウカ ゲンショウ カイフクホウ

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The drag reduction of a water flow with new drag reducing surfactants (amine oxide type nonionic surfactants, mixtures of amine oxide type nonionic surfactants and betaine type amphoteric surfactants) which were selected as environmentally acceptable drag reducing additives was investigated experimentally. <br> Addition of amine oxide type nonionic surfactants to hot or cold water can reduce flow drag in a turbulent pipe flow. The present research investigated how various ionic components dissolved in water affected this drag reducing effect. <br> It was found that ionic impurities contained in the water affected the pipe flow drag reducing effect by amine oxide type nonionic surfactants. Moreover, it was clarified that the decrease in the pipe flow drag reducing effect was recovered by adding a mixture of amine oxide type nonionic surfactants and betaine type amphoteric surfactant to the water with ionic impurities.

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