NAITOH Takashi

写真a

Affiliation Department etc.

Department of Physical Science and Engineering
Department of Physical Science and Engineering

Title

Associate Professor

Graduate School

  •  
    -
    1991.03

    Nagoya Institute of Technology  Graduate School, Division of Engineering  Master's Course  Completed

Degree

  • Nagoya Institute of Technology -  Master of Engineering

  • Nagoya Institute of Technology -  Doctor (Engineering)

Field of expertise (Grants-in-aid for Scientific Research classification)

  • Fluid engineering

 

Research Career

  • Study on Mass Transport using Vortex Rings

    (not selected)  

    Project Year:   - 

Papers

  • On the evolution of vortex rings with swirl

    Takashi Naitoh, Nobuyuki Okura, Toshiyuki Gotoh, Yusuke Kato

    Physics of Fluids   26 ( 6 ) 067101   2014.06  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Mass transport using the series of vortex rings with swirl

    Takashi NAITOH, Nobuyuki OKURA, Osamu SUMITOMO

    Journal of Fluid Science and Technology   9 ( 3 ) JFST0060   2014.09  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Transition patterns of negatively buoyant vortex rings

    Takashi NAITOH, Tomomi TANAKA

    Proc. of the 11th Pacific Symposium on Flow Visualization and Image Processing     2017.12  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    We experimentally observed the formation and development of the negatively buoyant vortex rings which are formed by pushing lighter fluid vertically downward. In this case, the buoyancy force and momentum flux are opposed. We targeted at the negatively buoyant vortex rings in the wide range of Reynolds number and Froude number, 3,600 ≤ ReUjmax ≤ 22,000 and 0.4 ≤ Fr ≤ 14.4, and dealt with making a map of flow development patterns of the rings by means of planer laser-induced fluorescence technique. Buoyant vortex ring development patterns are classified into five types including three types of transition patterns to be turbulent and revealed the Reynolds number range in which the negatively buoyant vortex ring becomes turbulent in relation to the Froude number.

  • Penetration by a Negatively Buoyant Vortex Ring

    Takashi NAITOH, Nobuyuki OKURA et al.

    Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015) ( Springer International Publishing )    565 - 570   2016  [Refereed]

    Research paper (international conference proceedings)   Multiple Authorship

    In order to investigate the vortex motion affected by buoyancy force, we experimentally formed a negatively buoyant vortex ring by pushing less dense fluid vertically downward out of a nozzle and measured the penetration depth of it in the wide Reynolds number range, 3,000 < Re < 30,000. We confirmed that the penetration depth of negatively buoyant vortex rings generally depends only on the Froude number and it is larger than that of the jet for the same Froude number in the range of Fr > 2. The formation conditions of buoyant vortex rings to be turbulent or laminar are also examined, since the characteristic features of buoyant turbulent vortex rings are markedly different from those of buoyant laminar rings.

  • Characteristics of Mass Transport by a Vortex Ring

      31 ( 2 ) 187 - 194   2012.04  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Quantitative Measurement of Mass Transport Using Vortex Rings

    Takashi NAITOH, Nobuyuki OKURA, Muneshige OKUDE and Yusuke UTSUMI

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B   77 ( 775 ) 557 - 567   2011.03  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Scaling and instability of a junction vortex

    J.J.Allen T.Naitoh

    Journal of Fluid Mechanics   574   1 - 23   2007.02  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Experimental study of the production of vortex ring

    J.J.Allen T.Naitoh

    Physics of Fluids(Letter)   17 ( 6 ) 061701 - 1   2005.04  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Experimental study of axial flow in a vortex ring

    T.Naitoh N.Fukuda T.Gotoh H.Yamada K.Nakajima

    Physics of Fluids   14 ( 10 ) 143 - 149   2002.04

    Research paper (scientific journal)   Single Author

  • Longitudinal vortex structure in the flow field produced by a vortex ring impinging on a flat plate

    T.Naitoh O.Banno H.Yamada

    Fluid Dynamics Research   28 ( 10 ) 61 - 74   2000.04  [Refereed]

    Research paper (scientific journal)   Single Author

display all >>

Presentations

  • Vortex rings generated from rotating cylinder

    Hiroyuki IMAMURA, Takashi NAITOH

    the 15th meetin of Japan Society of Fluid Mechanics, Chubu branch  2017.12  -  2017.12 

  • Vortex ring formed from nozzle with rifling

    Sho KONDO, Takashi NAITOH, Hajime Goshima

    the 15th meeting of Japan Society of Fluid Mechanics, Chubu branch  2017.12  -  2017.12 

  • Quantitative measurement of mass transportation using negatively buoyant vortex rings

    Akihiro KAMO, Takashi NAITOH, Seiji SATO, Tomomi TANAKA

    JSFM Annual Meeting 2016  (Nagoya Institute of Technology)  2016.09  -  2016.09  The Japan Society of Fluid Mechanics

  • Formation regimes of negatively buoyant turbulent vortex rings

    Tomomi TANAKA, Takashi NAITOH

    JSFM Annual Meeting 2015  (Tokyo Institute of Technology)  2015.09  -  2015.09  The Japan Society of Fluid Mechanics

  • Negatively Buoyant Vortex Ring

    2014.11  -  2014.11 

Academic Awards Received

  • Award for Excellent Visualized Image (Technical Section)

    1997.04