Meltwater Behavior During the Defrosting Process By Using X-ray Radiography

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  • MATSUMOTO Ryosuke
    Department of Mechanical Engineering, Kansai University
  • SHIOKAWA Takahiro
    Graduate School of Science and Engineering, Kansai University
  • NISHIURA Yuto
    Graduate School of Science and Engineering, Kansai University
  • ODA Yutaka
    Department of Mechanical Engineering, Kansai University
  • ITO Daisuke
    Institute for Integrated Radiation and Nuclear Science, Kyoto University
  • SAITO Yasushi
    Institute for Integrated Radiation and Nuclear Science, Kyoto University

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Other Title
  • Ｘ線ラジオグラフィを用いた除霜時の融解水挙動の評価
  • Xセン ラジオグラフィ オ モチイタ ジョソウジ ノ ユウカイスイ キョドウ ノ ヒョウカ

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Abstract

<p> The defrosting process is important to keep the heat transfer performance of the heat exchanger for the frosting condition. The frost layer is a porous structure of ice crystals and air pores. Thus, the meltwater penetrates into the remaining frost layer by the capillary effect during the defrosting process. In this study, the meltwater penetration behavior on the single vertical aluminum-plate was measured by using X-ray radiography. The water deposition distribution on the aluminum plate was estimated quantitatively by the X-ray beam attenuation in every 10 seconds. The meltwater behavior was estimated by comparing the frost deposition distribution before melting. Frost layer melting was started from the leading edge of the aluminum plate by increasing the temperature to 0 C. deg., then, the meltwater penetrated into the remaining frost layer along the aluminum plate in the vertical direction. The meltwater penetration behavior can be observed by the X-ray radiography.</p>

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