• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/sadh/046/0002

    • Keywords

       

      Cryogenic chilldown; CHF; Helical coil; Helix angle; Liquid nitrogen; Straight tube

    • Abstract

       

      Chilldown of transfer lines is an important phenomenon associated with cryogenic liquid transfer from the storage facility to the location of its intended application. Analysis of heat transfer characteristics during cryogenic chilldown of a helical coil is the focus of this study. In view of the ease in availability and handling compared to other cryogens, Liquid nitrogen is adopted. The cryogen was transmitted through copper helical test sections with 7.94 mm outer diameter, 0.81 mm wall thickness and having helix angles 4°, 6°, 8°, 10°, 12° and 16° with horizontal axes, at three different mass fluxes, that is, 66 kg/m2s, 86 kg/m2s and 102 kg/ m2s under terrestrial gravity conditions. Temperature-time relationships were obtained and the results were compared with that of straight channels. The results of the experiment indicated that the chilldown time for coils of different helix angles were different at a given mass flux. Also, for a given helix angle, chilldown time varied inversely with mass flux. Results suggested the prospect of an optimum helix angle that can serve in minimizing the chilldown time, thereby reducing cryogenic liquid consumption. Finding correlations connecting heat transfer parameters in helical coils would enhance the scope of this study.

    • Graphical Abstract

       

    • Author Affiliations

       

      JESNA MOHAMMED1 S S BINDU2 ABDUL MOHIZIN3 K E REBY ROY1

      1. Department of Mechanical Engineering, TKM College of Engineering, Kollam 691005, India
      2. Department of Mechanical Engineering, R I E T, Trivandrum, India
      3. Department of Mechanical Engineering, Graduate School, Kookmin University, Seoul 02707, Republic of Korea
    • Dates

       
  • Sadhana | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.