Change of size distribution of snowflakes caused by melting-disintegration process

融化-崩解过程引起的雪花尺寸分布的变化

• 批准号: 04640413
• 负责人: FUJIYOSHI Yasushi
• 金额: $ 1.34万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04640413/
• 关键词: snowflake; melting; rain drop; size distribution; みぞれ

The author measured size distributions of water droplets which were made by melting snowflakes in kerosene. The number of water droplets increases almost linearly with increasing the mass of snowflakes. As the number of water droplets incteases largely with increase in the mass of snowflakes, average size of water droplets decreases with increasing the mass of snowflakes. The stanbard deviation of the size distribution of water droplets decreases with increasing the mass of snowflakes, and the heavy snowflakes tend to make relatively small water droplets.The snowflakes which disintegrated into large number of water droplets have large characteristic factors, that is, diameter, mass, cross sectional area and the degree of ruggedness. However, the snowflakes with large characteristic factors written above did not necessarily disintegrate into large number of water droplets. The correlations between the degree of raggedness and cross sectional area, and moment and mass were poor. These results indicate that the moment and the degree of raggedness do not depend on the mass and size of snowflakes. The moment and the reggedness of snowflakes closely relate to coalescence process of ice crystals in the air. Therefore, ice crystals randomly coalesce and the way of coalescence does not depend on the mass and size of snowflakes.

作者测量了用煤油熔化雪花后水滴的大小分布。水滴的数量几乎随雪花质量的增加而线性增加。水滴的数量随着雪花质量的增加而大幅度增加，水滴的平均大小随着雪花质量的增加而减小。水滴大小分布的标准差随着雪花质量的增加而减小，重雪花往往形成相对较小的水滴。崩解成大量水滴的雪花具有较大的特征因素，即直径、质量、横截面积和坚固程度。然而，上述特征因子较大的雪花并不一定会分解成大量的水滴。破碎度与横截面积、弯矩与质量的相关性较差。这些结果表明，碎裂的瞬间和程度并不取决于雪花的质量和大小。雪花的瞬间和形状与空气中冰晶的聚结过程密切相关。因此，冰晶是随机合并的，合并的方式与雪花的质量和大小无关。

项目成果

村本健一郎: "融解雪片の画像処理解析" 雪氷北信越. 11号. 51 (1993)

Kenichiro Muramoto：“融化的雪花的图像处理分析”《雪与冰北信越》第 11. 51 期（1993 年）。