颗粒与热扩散联合作用下柱状冰晶生长的测量
Measurements of Cylindrical Ice Crystal Growth Limited by Combined Particle and Heat Diffusion
摘要:
我们目前的测量长柱状冰晶的生长从水蒸气在很宽的温度范围内,在空气中的过饱和水平。从薄的c轴冰针晶体开始,我们观察了它们随后在蒸汽扩散室中的生长行为,在受控条件下提取针的初始径向生长速度。将六角针状晶体近似为无限长的圆柱体,我们创建了一个分析生长模型,该模型包括水分子通过周围空气的颗粒扩散以及固化产生的热量扩散的影响。只有最小的调整模型参数,我们得到了很好的协议与我们的实验数据。据我们所知,这是第一次在水蒸气的冰生长中测量到粒子和热扩散的综合效应。该分析进一步提供了一种精确的方法,用于校准实验生长室中的水蒸气过饱和水平。
英文摘要:
We present measurements of the growth of long columnar ice crystals from water vapor over a broad range of temperatures and supersaturation levels in air. Starting with thin, c-axis ice needle crystals, we observed their subsequent growth behavior in a vapor diffusion chamber, extracting the initial radial growth velocities of the needles under controlled conditions. Approximating the hexagonal needle crystals as infinitely long cylinders, we created an analytical growth model that includes effects from particle diffusion of water molecules through the surrounding air along with the diffusion of heat generated by solidification. With only minimal adjustment of model parameters, we obtained excellent agreement with our experimental data. To our knowledge, this is the first time that the combined effects from particle and heat diffusion have been measured in ice growth from water vapor. This analysis further provides an accurate method for calibration of the water-vapor supersaturation levels in experimental growth chambers.
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