高温下含湿土壤水汽潜热效应的试验研究  

Experimental Study on Latent Heat Effect of Moist Soil at High Temperature

作　　者：徐云山 曾召田[2,3] 孙德安[1,2] 吕海波[2,3] 

机构地区：[1]上海大学土木工程系,上海200072 [2]桂林理工大学广西建筑新能源与节能重点实验室,广西桂林541004 [3]广西大学土木建筑工程学院,广西南宁530004

出　　处：《防灾减灾工程学报》2017年第4期593-597,共5页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(41502284;51568014);桂林理工大学博士科研启动基金项目(2016254)资助

摘　　要：目前国内外关于高温下土壤水汽潜热效应的研究极其缺乏,制约了对高温下土壤热特性的充分认识。通过高温下3种不同质地土壤的热导率试验,探讨并分析了土壤水汽潜热效应及水蒸汽运移增强因子η取值的变化规律。结果表明,温度梯度作用下,土壤内部会产生水汽潜热效应,且温度越高,现象越明显;高温引起的潜热效应贡献值有明显的峰值,并存在滞后现象;水蒸汽运移增强因子η较依赖于土壤质地和饱和度,但其取值规律仍然不明确。Currently, there is an extreme lack of experimental study on the latent heat effect of soil water vapor at high temperature around world, which restricts the full acknowledging of soil thermal characteristics at high temperature. Through the thermal conductivity test of three dif- ferent soils at high temperature, the change of soil water vapor latent heat effect and water vapor transport enhancement factor 71 was discussed and analyzed. The results of test indicates that the latent heat effect of water vapor is generated inside the soil under the effect of temperature gradi- ent, and the higher the temperature, the more obvious the phenomenon. The latent heat effect contribution caused by high temperature has obvious peak value and there is lag phenomenon. The water vaporization enhancement factor 7] is more dependent on soil texture and saturation, but the law of value is still unclear.

关 键 词：潜热效应 增强因子 温度效应 土壤质地 

分 类 号：TK529[动力工程及工程热物理—热能工程]