Institute of Slush Hydrogen.

 Institute of Slush Hydrogen (ISH) focuses on the research of thermo-fluid phenomena of cryogenic multi-phase flow such as slush flow, boiling flow, and cavitation flow, and on their applications to advanced cryogenic equipment.
 Slush hydrogen (temperature of 14 K) contains solid hydrogen particles with the particle size of about 1 mm in liquid hydrogen. It provides an attractive means for energy transportation and storage as functional thermal fluid with superior characteristics due to the high density and latent heat of fusion of the solid particles. In the case of a mass solid fraction of 50 wt.%, slush hydrogen features a 15% greater density, and a 18% increase in refrigerant heat capacity.
 ISH has originally proposed

a high-efficiency hydrogen energy system using slush hydrogen

taking advantage of the synergetic effect of simultaneous transportation and storage of hydrogen fuel and electrical power, and been engaged in research and development work to put it to practical use.

What's New.

  • May 2016
    Institute of Slush Hydrogen (ISH) was established.
  • 31 May 2016
    Cryogenics and Superconductivity Society of Japan (CSSJ) awarded the certificate of Fellow to Dr. Ohira.
  • 1 Jun. 2016
    Dr. Ohira gave a presentation on “Pressure drop of vapor-liquid two-phase nitrogen flow in an unheated horizontal circular pipe” at CSSJ Conference.
  • 31 Oct. and 1 Dec. 2016
    Dr. Ohira attended as an expert of liquid hydrogen technology "Meeting on safety standards for high-pressure hydrogen gas pressurized by a liquid hydroge pump" and "Working group for leakage experiments and numerical simulations of high-pressure liquid hydrogen" (contracted-out from NEDO to JIMGA).
  • Jan. 2017
    Original research paper on "Pressure-drop reduction and heat-transfer deterioration of slush nitrogen in triangular and circular pipe flows" was published in Cryogenics Vol. 81 (2017), No. 1, 60-75.
  • 1 Apr. 2017
    Article on "Development of a high-efficiency hydrogen storage system using liquid and slush hydrogen" was published in Chemical Engineering Vol. 62 (2017), No, 4, 19-26. (in Japanese)
  • 21 Apr. 2017
    Dr. Ohira gave an invited lecture on "Flow and heat transfer study of cryogenic multiphase flow in the development of cryogenic equipment" at Tohoku and Hokkaido Branch Conference of CSSJ.
  • 22 May 2017
    Dr. Ohira gave a presentation on “Pressure drop and heat transfer characteristics of boiling nitrogen in horizontal inverted triangular pipe flow” at CSSJ Conference.
  • 29 May 2017
    Dr. Ohira attended as an expert of liquid hydrogen technology "Meeting on safety standards for high-pressure hydrogen gas pressurized by a liquid hydroge pump" and "Working group for leakage experiments and numerical simulations of high-pressure liquid hydrogen".
  • 19 Jun. 2017
    Dr. Ohira attended “JAXA-Tokyo Univ. collaborative research meeting on rocket propellant and reactive thermal flow”.
  • 14 Aug. 2017
    Home page "Institute of Slush Hydrogen" was open in Japanese. URL; http://slush-ish.com/
  • 25 Sep. 2017
    Home page "Institute of Slush Hydrogen" was open in English. URL; http://slush-ish-english.com/
  • 5 Jan. 2018
    Web site "Hydrogen Liquefaction by Magnetic Refrigeration" was open in Japanese and English.
    URL; http://slush-ish-mag.com/ , http://slush-ish-mag-english.com/
  • 28 Feb. 2018
    Web site "Pressure Drop Reduction and Heat Transfer Deterioration of Slush Nitrogen" was open in Japanese and English.
    URL; http://slush-ish-nitro.com/ , http://slush-ish-nitro-english.com/
  • 15 Nov. 2018
    Dr. Ohira gave a lecture on “The forefront research of flow and heat transfer characteristics of cryogenic multiphase flow, and the trend of hydrogen energy utilization” at Nikko seminar 2018 "Optimization technology of cryogenic fluid instrumentation and control" promoted by Japan Industrial Publishing Co., LTD.