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2004 Fiscal Year Final Research Report Summary

Development of Rapid Cooling Method Using Wetting Improvement by Plasma Irradiation

Research Project

Project/Area Number 14350109
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

TAKATA Yasuyuki  Kyushu University, Faculty of Engineering, Professor, 大学院・工学研究院, 教授 (70171444)

Co-Investigator(Kenkyū-buntansha) KUBOTA Hiromi  Kyushu University, Faculty of Engineering, Research Associate, 大学院・工学研究院, 助手 (10117103)
NAKATA Naoki  JFE Steel Corp., Steel Research Laboratory, Senior Researcher Staff manager, スチール研究所, 主任研究員
Project Period (FY) 2002 – 2004
KeywordsPlasma irradiation / Superhydrophilicity / Phase change / Boiling / Evaporation / Contact angle
Research Abstract

The purpose of this research project is to develop an enhanced cooling method making use of plasma irradiation which enhances surface wattability of various solid surfaces.
Three metals, aluminum, copper and stainless steel were selected as the test materials. First, the following were investigated experimentally to understand the fundamental characteristics and relationship between plasma irradiation and surface wettablity ;
(1)change in contact angle with irradiation time of plasma.
(2)Recovery process of surfaces from hydrophilic state to hydrophobic state, namely, relationship between contact angle and elapsed time after termination of irradiation.
As a result, it was turned out that aluminum was the best among three metals. The contact angle of aluminum decreased to nearly zero, while the terminal contact angles of copper and stainless steel during irradiation were nearly 10 degree. In case of aluminum, special treatment has also been done on its surface to have a fractal surface structure. This surface initially had a superhydrophilic nature, but it gradually changed and finally became super-water-repellent.
In order to know the cooling ability, experiments of water drop evaporation using above surfaces have conducted and the following results were obtained ;
(1)When the surface temperature was 50 degree C, evaporation time of water drop depended on contact angle. By the decrease in contact angle, evaporation time was drastically decreased and the evaporation was enhanced by the improvement of surface wettablity.
(2)The wetting limit temperature increased with the decrease in contact angle. In case of aluminum and copper, the wetting limit temperature increased by 45K by the plasma irradiation.
It was found that the wetting improvement by plasma irradiation was one of the promising methods of rapid cooling technique.

  • Research Products

    (10 results)

All 2005 2004 2003 2002

All Journal Article (10 results)

  • [Journal Article] Effect of surface wettability on boiling and evaporation2005

    • Author(s)
      Y.Takata, S.Hidaka, J.M.Cao, T.Nakamura, H.Yamamoto, M.Masuda, T.Ito
    • Journal Title

      Energy, The International Journal 30-2

      Pages: 209-220

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effect of surface wettability on boiling and evaporation2005

    • Author(s)
      Y.Takata, S.Hidaka, J.M.Cao, T.Nakamura, H.Yamamoto, M.Masuda, T.Ito
    • Journal Title

      Energy, The International Journal Vol.30, Issue 2

      Pages: 209-220

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Evaporation of Water Drop on a Plasma-irradiated Hydrophilic Surface2004

    • Author(s)
      Y.Takata, S.Hidaka, A.Yamashita, H.Yamamoto
    • Journal Title

      International Journal of Heat and Fluid Flow 25-2

      Pages: 320-328

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Evaporation of Water Drop on a Plasma-irradiated Hydrophilic Surface2004

    • Author(s)
      Y.Takata, S.Hidaka, A.Yamashita, H.Yamamoto
    • Journal Title

      International Journal of Heat and Fluid Flow Vol.25, No.2

      Pages: 320-328

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Photo-induced Hydrophilicity and Its Applications to Phase Change Phenomena2003

    • Author(s)
      Y.Takata
    • Journal Title

      Thermal Science & Engineering Vol.10, No.2

      Pages: 31-38

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Pool Boiling on a Superhydrophilic Surface2003

    • Author(s)
      Y.Takata, S.Hidaka, M.Masuda, T.Ito
    • Journal Title

      International Journal of Energy Research 6Vol.27,Issue

      Pages: 111-119

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Pool Boiling on a Superhydrophilic Surface2003

    • Author(s)
      Y.Takata, S.Hidaka, M.Masuda, T.Ito
    • Journal Title

      International Journal of Energy Research Vol.27, Issue 2

      Pages: 111-119

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Control of Surface Wettability by Plasma Irradiation2002

    • Author(s)
      Y.Takata
    • Journal Title

      Proceedings of the Fourth Pacific Rim Thermal Science and Energy Engineering Workshop (PaRTSEE-4)

      Pages: 113-116

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Evaporation of Water Drop on Photo-Induced Hydrophilic Surface2002

    • Author(s)
      Y.Takata, S.Hidaka, H.Yamamoto, M.Masuda, T.Ito
    • Journal Title

      Proceedings of the 12th International Heat Transfer Conference Vol.3

      Pages: 413-418

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Photo-induced Hydrophilicity and Its Applications to Phase Change Phenomena2002

    • Author(s)
      Y.Takata
    • Journal Title

      Thermal Science & Engineering Vol.10, No.6

      Pages: 31-38

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2006-07-11  

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