摘要
考虑温度对土壤湿分迁移的影响,建立描述存在干饱和层时的土壤热湿传递的数学模型,并就自然环境和恒定太阳辐照下两种情况进行数值模拟,获得不同环境条件下土壤中温度和湿分分布以及水分蒸发的动态特性,分析干饱和土壤层对土壤热湿迁移与水分蒸发以及温度对土壤湿分传输的影响。
A general mathematical model for investigating simultaneous heat and moisture transfer and water evaporation in porous soil with unsaturated and dry regions was proposed by considering the temperature effect on soil moisture migration, based on the volume-averaging method and a set of governing equations were developed. By the use of numerical method, the transient distributions of temperature and moisture inner soil were obtained under two different conditions, the natural condition and the steady solar radiation. Both the influence of dry soil region on heat and moisture transfer in soil and water evaporation and the influence of temperature on moisture transport were analyzed.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2004年第6期850-854,共5页
Acta Energiae Solaris Sinica
基金
国家重点基础研究发展规划(G2000026303)国家自然科学基金项目(50376015)
关键词
土壤
干饱和层
非饱和层
土壤温度
水分蒸发
Computer simulation
Drying
Dynamics
Evaporation
Heat transfer
Mass transfer
Mathematical models
Moisture
Solar radiation
Water
