Effects of various factors on rime icing Part I: Effects of temperature and wind velocity

Takeshi UCHIDA; Sho KUSUMOTO; Shimon ANDO

doi:10.5331/seppyo.53.145

霧氷生成に及ぼす各種因子の影響

第一報:温度・風速による影響

内田武, 楠本韶, 安藤司文

著者情報

ジャーナルフリー

1991 年 53 巻 2 号 p. 145-154

DOI https://doi.org/10.5331/seppyo.53.145

詳細

発行日: 1991/06/30 受付日: 1990/03/29 J-STAGE公開日: 2009/08/07 受理日: 1991/04/05 早期公開日: - 改訂日: -
訂正情報
訂正日: 2009/08/07 訂正理由: - 訂正箇所: 論文抄録訂正内容: Wrong : Rime, a kind of icing, on trees on high mountains, is widely known as a beautiful creation of nature in winter. However, because the climatic conditions necessary to produce icing are not so frequently satisfied, the incidence of such icing is limited to the western regions of Japan, like Mt. Unzen in Nagasaki prefecture, famous for rime.
The present study was conducted to make it possible to see indoor artifical icing throughout the year. In this study cooled wet air at temperatures of -5 and -10°C at a wind velocity of 5, 10 and 15 m/s was forced to flow through an acrylic resin pipe of 30 mm diameter in which a needle and a small wooden stick were mounted as bases for the icing to grow on. Mists from an ultrasonic humidifier were used to wet the cooled air. Using these facilities the relations between the test conditions and the characteristics of icing produced were investigated.
Various types of icing, hard rime, soft rime, glaze and air hoar were produced artificially by controlling the test conditions. The shapes and the growth speed of icing changed with the test conditions and some of the relations between them were clarified. The catch ratio in the present experiment was remarkably low in comparison with other researchers' data.
Right : Rime, a kind of icing, on trees on high mountains, is widely known as a beautiful creation of nature in winter. However, because the climatic conditions necessary to produce icing are not so frequently satisfied, the incidence of such icing is limited to the western regions of Japan, like Mt. Unzen in Nagasaki prefecture, famous for rime.
The present study was conducted to make it possible to see indoor artifical icing throughout the year. In this study cooled wet air at temperatures of -5 and -10°C at a wind velocity of 5, 10 and 15 m/s was forced to flow through an acrylic resin pipe of 30 mm diameter in which a needle and a small wooden stick were mounted as bases for the icing to grow on. Mists from an ultrasonic humidifier were used to wet the cooled air. Using these facilities the relations between the test conditions and the characteristics of icing produced were investigated.
Various types of icing, hard rime, soft rime, glaze and air hoar were produced artificially by controlling the test conditions. The shapes and the growth speed of icing changed with the test conditions and some of the relations between them were clarified. The catch ratio in the present experiment was remarkably low in comparison with other researchers' data.

抄録

着氷の一種である霧氷は,冬の美しい自然の造形としてよく知られている.長崎県島原半島中央に位置する雲仙の霧氷も有名ではあるが,霧氷が生成するための気象条件はなかなか満足されないため,特に西日本地域においては,霧氷が着氷する機会はかなり限られている.そこで,この研究は室内での人工的な霧氷の生成を可能にし,年間を通して霧氷の観測ができるようにすることを目的としている.本実験では,内径30mmの透明アクリルパイプを用いて,温度は-5・-10℃,風速は5・10・15m/sと変化させ,被着氷物として注射針と木の棒を使用した.また,加湿には超音波加湿器からの霧を使用した.これらの条件下で実験を行い,実験条件と着氷生成の特徴との関わりについて検討した.その結果,実験条件を様々に変化させることにより,密霧氷・粗霧氷・雨氷・樹霜などを着氷させることができた上,着氷形状や着氷速度と実験条件(温度・風速)との関係が明らかになってきた.また,本実験で得られた捕捉率は,他研究者の値よりかなり小さくなったが,この原因については今後検討を要する.

責任著者(Corresponding author)

訂正情報

J-STAGEへの登録はこちら（無料）