太阳辐照下湿份分层土壤中热湿传输的数值模拟  

DYNAMIC SIMULATION OF HEAT AND MASS TRANSPORTATION IN SOIL WITH WET AND DRY REGIONS UNDER SOLAR RADIATION

作　　者：刘炳成[1] 刘伟[1] 王崇琦[1] 

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《太阳能学报》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)

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.

关 键 词：土壤 干饱和层 非饱和层 土壤温度 水分蒸发 

分 类 号：TK124[动力工程及工程热物理—工程热物理]