Abstract:

At present，in the study of the frost conductivity，the structure of frost is considered as symmetrical.In fact，the conductivity of frost not only depends on its density，but is also affected by its structure.In this paper，the structure of frost crystal was analyzed，and a model of frost growth was presented.This process was simulated by computer.Based on this structure，the equation of energy balance was given for every node，and the conductivity of frost was obtained.The result indicated that this method more truly reflected the process of crystal growth，and the conductivity also agreed with the characteristics of frost at different stages.

Key words:

霜生长模型, 热导率, 结霜, 冰晶体, 计算机模拟

摘要：

目前对霜层热导率的研究中，大多把霜层看作均匀的结构，而实际上霜层的热导率不仅取决于密度，同时也受霜层结构的影响。本文分析了实验观察到的霜晶体结构，提出了不同阶段的霜层生长模型，并采用计算机方法模拟这个过程。以模拟所得的霜晶体结构为基础，对每个节点列出了能量平衡方程，进而求得了霜层的热导率。结果表明，这种模拟方法较准确地反映了霜层中晶体的生长过程，计算所得的热导率也反映出霜层不同生长阶段的特点。

关键词:

霜生长模型, 热导率, 结霜, 冰晶体, 计算机模拟