土壤高温储热过程中的温/湿度峰值现象  

PEAK PHENOMENON OF TEMPERATURE AND HUMIDITY DURING HIGH-TEMPERATURE HEAT STORAGE IN SOIL

作　　者：王华军[1] 齐承英[1] 杜红普[1] 黄斌[1] 

机构地区：[1]河北工业大学能源与环境工程学院,天津300401

出　　处：《太阳能学报》2011年第4期490-495,共6页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50906020);天津市应用基础及前沿技术研究计划(10JCYBJC08500)

摘　　要：建立了一维土壤高温热湿迁移实验装置，获得了温度场和湿度场的动态变化规律，提出了温度峰值比和湿度峰值比的概念。实验结果表明，土壤温度场和湿度场均呈现明显的峰值特征，尤其在热源附近处表现更为剧烈，最大温度峰值比和湿度峰值比均超过2．0。湿度峰值主要发生在初始饱和度为4％～18％的范围内，且温／湿度峰值现象的总体变化特征呈相反趋势，湿度峰值时间大于温度峰值时间。对于远离热源的地方，温／湿度峰值现象表现逐渐微弱，且出现时间相对滞后。结合光学显微分析表明，由温度梯度引起的土壤水分的蒸发．扩散．冷凝过程是温，湿度峰值现象的重要产生机制之一。A one-dimensional experimental setup for heat and moisture transfer was built, and dynamic behavior of temperature-humidity field was observed. Further, the concept of temperature peak ratio and humidity peak ratio was presented. The results showed that obvious temperature and humidity peaks appeared, especially the maximum temperature/ humidity peak ratio exceeded 2.0 near the heat source. Within the initial saturation range of 4% - 18%, the variation of temperature and humidity peaks with the initial humidity contents had a contrary tendency, and the moisture peak time was longer than the temperature peak time. For the place far from the heat source, temperature-moisture peaks tended to be weaker and a time lag. By means of optical microscopic observations, it was found that the evaporation-condense diffusion of vapor due to the thermal gradient is one of important mechanisms that leads to temperature-humidity peaks in hightemperature heat storage of soils.

关 键 词：土壤 高温储热 热湿迁移 峰值现象 

分 类 号：TK124[动力工程及工程热物理—工程热物理]