The Melting Layer: A Laboratory Investigation of Ice Particle Melt and Evaporation near 0°C
The Melting Layer: A Laboratory Investigation of Ice Particle Melt and Evaporation near 0°C
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融化层：0°C 附近冰粒融化和蒸发的实验室研究
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Hallett
中科院分区：
文献类型：
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作者：
R. G. Oraltay;J. Hallett
摘要 在实验室中，在受控的温度、相对湿度和空气流速下模拟雪晶个体和聚集体的融化、冻结和蒸发。选定习性的晶体在垂直细丝上生长，随后在逆流中熔化或蒸发，将速度调整为适当的下落速度以再现熔化层的条件。模拟非平衡条件，用于在高达 +5°C 的温度下被较小液滴包围的较大融化冰粒，或在低至 -5°C 的温度下被冷冻冰粒包围的冰晶生长。明确的多面晶体（无论是单独的还是组合的）的初始熔化表现为厚度 >10 μm 的水层。对于较大（>100μm）的晶体，水被毛细管力隔离，作为被无水冰区域分开的单个液滴，通常沿着蒸发树突的针、柱或臂具有准周期位置。水滴也位于骨料的交叉点...
Abstract Melting, freezing, and evaporation of individual and aggregates of snow crystals are simulated in the laboratory under controlled temperature, relative humidity, and air velocity. Crystals of selected habit are grown on a vertical filament and subsequently melted or evaporated in reverse flow, with the velocity adjusted for appropriate fall speed to reproduce conditions of the melting layer. Nonequilibrium conditions are simulated for larger melting ice particles surrounded by smaller drops at a temperature up to +5°C or growth of an ice crystal surrounded by freezing ice particles down to −5°C. Initial melting of well-defined faceted crystals, as individuals or in combination, occurs as a water layer >10 μm thick. For larger (>100 μm) crystals the water becomes sequestered by capillary forces as individual drops separated by water-free ice regions, often having quasiperiodic locations along needles, columns, or arms from evaporating dendrites. Drops are also located at intersections of aggregate...