加热条件下含湿多孔介质中液体分布及机理  

Liquid Distribution and the Mechanism in Heated Wet Porous Medium

作　　者：胡爱娟[1,2] 路春美[1] 王迎亚[2,3] 于明志[2,3] 

机构地区：[1]山东大学能源与动力工程学院,济南250061 [2]山东建筑大学热能工程学院,济南250101 [3]可再生能源建筑利用技术教育部重点实验室,济南250101

出　　处：《工程热物理学报》2016年第7期1544-1548,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51176104)

摘　　要：建立了考虑临界含湿率的非饱和含湿多孔介质加热条件下的热质传输模型。含湿率低于临界值时,由于不同孔隙内水分互不接触,无法在高低含湿率区域间产生由于毛细作用而引起的液体流动,因而忽略介质中液相毛细流动;当含湿率高于临界值时,则考虑液相毛细流动。利用建立的模型,对加热条件下低于和高于临界含湿率情况下的堆积颗粒多孔介质中水分迁移情况进行了分析。模拟分析及实验研究表明应根据含湿率与临界含湿率关系确定是否考虑由毛细力引起的流动。A model is proposed to describe the coupled heat and moisture transfer by taking into account the critical moisture content in heated unsaturated wet porous media.For liquid maintains isolated in different pores when the liquid content is below the critical value,there is no flow caused by the capillary action between different regions in a porous medium,thus the model ignores the liquid flow driven by capillary force.However,the capillary driven flow is included in the model when liquid content is higher than the critical value.By this model,moisture migration in unsaturated particle stacked porous media has been probed into.Simulation and experiments show that whether or not to consider the capillary driven liquid flow is do according to the relationship between the moisture content and the critical value.

关 键 词：多孔介质 毛细力 液体分布 

分 类 号：TK124[动力工程及工程热物理—工程热物理]