Estimation of Frost Formation by using Neutron Radiography

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  • MATSUMOTO Ryosuke
    Department of Mechanical Engineering, Faculty of System Engineering, Kansai University
  • YOSHIMURA Tomoya
    Department of Mechanical Engineering, Faculty of System Engineering, Kansai University
  • UMEKAWA Hisashi
    Department of Mechanical Engineering, Faculty of System Engineering, Kansai University
  • AMI Takeyuki
    Department of Mechanical Engineering, Faculty of System Engineering, Kansai University
  • ITO Daisuke
    Kyoto University Research Reactor Institute
  • SAITO Yasushi
    Kyoto University Research Reactor Institute

Bibliographic Information

Other Title
  • 中性子ラジオグラフィを用いた着霜の評価
  • 中性子ラジオグラフィを用いた着霜の評価 : 冷却平板での着霜量と物質伝達率の評価
  • チュウセイシ ラジオグラフィ オ モチイタ チャクソウ ノ ヒョウカ : レイキャク ヘイバン デ ノ チャクソウリョウ ト ブッシツ デンタツリツ ノ ヒョウカ
  • －冷却平板での着霜量と物質伝達率の評価－
  • －Estimation of Frost Deposition and Mass Transfer Coefficient on Cold Flat Plate－

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Abstract

Frost formation on heat exchangers can have a serious impact on their heat transfer performance due to the thermal resistance and pressure drop by the frost layer. Many studies had been carried out to investigate frosting on a flat plate, cylindrical surface and heat exchangers. In conventional methods of measuring the frost formation, the frost is scraped from the surface, making the temporal and spatial distributions of its frost deposition difficult to determine. In the present study, the frost formation on a cold flat plate is investigated by using neutron radiography. Neutrons are strongly attenuated by the water molecules in the frost layer, but not by the aluminum cold flat plate. The frost formation can be quantitatively estimated based on neutron beam attenuation. The mass attenuation coefficient of water to the neutron beam is estimated by the calibration test using the phantom piece. Frost formation and growth on the cold flat plate could be clearly measured by neutron radiography. The frost deposition was measured every 10 min, so that the local frost accumulation rate could be estimated from differential images. The spatial and temporal distributions of the local mass transfer coefficient could be successfully measured using neutron radiography.

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