【摘要】 在逾渗理论的基础上,对霜层的导热系数进行分析。现有研究表明由于冰晶体的不断生长,会形成不同的集团,当在霜层中形成大的连通集团的时候,霜层导热系数的上升速度会突然加快。在此基础上提出了基于逾渗理论的导热模型,并采用数值模拟的方法验证了上述过程。以临界点为分界线,分别导出了霜层生长过程中,不同孔隙率下的导热系数的通用数学表达式。与其他导热模型的结果比较表明,本模型更加符合实际,并且有较大的使用范围。更多还原

【Abstract】 Based on the percolation theory, the thermal conductivity was discussed. The present experiment indicates that all kinds of aggregations will be formed with the ice crystal’s continuous growth. When a big connected aggregation was formed,the thermal conductivity of frost will increase abruptly.The thermal conductivity model is presented on the percolation theory and verified by the numeric simulation method.The expression of thermal conductivity in frost layer with different porosity was obtained.更多还原