高温下含湿土壤水汽潜热效应的试验研究

发布时间：2018-05-15 21:12

  本文选题：潜热效应 + 增强因子　； 参考：《防灾减灾工程学报》2017年04期

【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。
[Abstract]:At present, there is a lack of research on the latent heat effect of soil moisture at high temperature at home and abroad, which restricts the full understanding of the thermal properties of soil at high temperature. Through the thermal conductivity test of 3 different textural soils at high temperature, the variation law of the latent heat effect of soil vapor and the value of the enhancement factor of water vapor migration is discussed and analyzed. Under the action of gradient, the latent heat effect of water vapor will be produced in the soil, and the higher the temperature, the more obvious the phenomenon is. The contribution value of the latent heat effect caused by the high temperature has the obvious peak value, and the hysteresis phenomenon exists, and the water vapor migration enhancement factor is more dependent on the soil texture and saturation, but the law of its value is still not clear.

【作者单位】： 上海大学土木工程系;桂林理工大学广西建筑新能源与节能重点实验室;广西大学土木建筑工程学院;
【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
【分类号】：S152
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本文编号：1893955