Fundamental study on amount of spraying water in ice shell construction-Experiment on freezing phenomenon of snow+water to ice on horizontal plane-

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  • アイスシェル施工時の散水量に関する基礎的検討―水平面上の（雪＋水）→（氷）凍結実験―
  • アイスシェル セコウジ ノ サンスイリョウ ニ カンスル キソテキ ケントウ スイヘイメン ジョウ ノ ユキ ミズ コオリ トウケツ ジッケン
  • Experiment on freezing phenomenon of snow+water to ice on horizontal plane
  • 水平面上の(雪+水)→(氷)凍結実験

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Abstract

The determination of the optimum amount of water for spraying is an important problem to be solved with regard to the rationality in ice shell construction. For this purpose, in this study, the first step is analyzing the basic subject concerning the freezing phenomenon of the conversion from a snow+water layer to an ice layer on a horizontal plane. A thermal equation is formulated on the basis of the heat losses due to convection, and the evaporation and radiation on the surface. Further, a simple freezing experiment is performed for the quantitative evaluation of this equation. The results reveal that the snow+water layer freezes faster than the water layer, and the average thermal heat transfer coefficient of the snow+water is evaluated as 8.95×10-4(cal/(cm2 sec°C)).The results of this study indicate that the present method of spraying water can be further improved, and thereby reducing the construction period.

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