霧氷の生成機構について

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The pile of small ice particles is produced when the cold air containing plenty of small supercooled water droplets collide to an object and the droplets change into ice. Such a phenomenon or its product is called "icing" and the rime, a kind of icing, covering the mountain is widely known as a beautiful creation of nature in the winter. However the chances the icing occures are limitted in Sauthern district in Japan like Nagasaki even in Mt. Unzen famous for the rime because the condition of the climate to produce the icing is not so frequently satisfied. The present study was conducted to make it possible to see indoor artificial icing throughout the year. In this study cooled wet air of the temperature -5 to -10℃ was forced to flow through an acrylic resin pipe of 30mm diameter and 1750mm length in which a needle and a small branch were mounted as the base the icing grows. Mists from the atomizer was used to wet the cooled air. Using these facilities the relations between the test conditions and the characteristics of icing produced were investigated. The results are as follows; (1) Various types of icing, hard rime, soft rime, glaze and air hoar were produced artificially by controlling the test conditions. (2) The shapes and the grow speed of icing changed with the test conditions and some of the relations between them were clarified. (3) The catch ratio in the present experiment was remarkably small in comparison with another researcher's data. The reason is not clear, however it would have been from the difference of the content of water droplets in the air.
長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文

著者

内田武
北九州工業高等専門学校

霧氷の生成機構について

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