含有初始饱和度的毛细吸水过程的解析模型研究  

Analytical Model Study of Capillary Absorption Process with Initial Saturation

作　　者：瞿铭良 田帅奇 林青阳 范利武[1,2] 俞自涛[1,2] QU Ming-liang;TIAN Shuai-qi;LIN Qing-yang;FAN Li-wu;YU Zitao(Institute of Thermal Science and Power Systems,College of Energy Engineering,Zhejiang University,Hangzhou 310027,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学热工与动力系统研究所,杭州310027 [2]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《建筑节能（中英文）》2022年第9期9-12,共4页Building Energy Efficiency

基　　金：国家自然科学面上基金项目:面向建筑围护结构传湿过程的多层多孔介质界面传湿特性与界面湿阻形成的微观机理研究(52076189)。

摘　　要：建筑围护结构中的液态水传递对建筑能耗及建筑耐久性有着重要影响。准确描述液态水在毛细作用下的自发渗吸过程可以用于评估液态水对建筑体的影响。以典型天然建筑多孔材料Bentheimer砂岩为研究对象,基于理论分析,推导了含有初始饱和度的多孔材料自发渗吸过程的解析模型,并预测了初始含水饱和度为3%~15%下的毛细吸水系数和内部饱和度分布,同时,我们通过标准毛细吸水实验对模拟结果进行验证。实验结果表明,随着初始饱和度的增加,材料的毛细吸水系数从(0.339±0.03) kg/(m^(2)·s^(0.5))降低到(0.253±0.02) kg/(m^(2)·s^(0.5)),与模拟结果吻合。同时,实验测得最终含水饱和度为0.510±0.007,与模型预测结果0.515±0.023相差在1%以内,证明模型具有一定的准确性,可以为建筑热工设计提供指导。The liquid water transfer in building envelope plays an essential role in energy efficiency and durability. It is necessary to describe the spontaneous imbibition for evaluating the influence of liquid transfer in the porous media driven by capillary pressure. An analytical model is established to describe the process of spontaneous imbibition and study the capillary water absorption coefficient and saturation profile for nature building material Bentheimer sandstone with different initial saturation like 3%~15%. Then, we verified the model by standard capillary absorption test. According to the experimental result, the capillary water absorption coefficient decreases from(0.339±0.03) kg/(m^(2)·s^(0.5)) to(0.253±0.02) kg/(m^(2)·s^(0.5)) with the increase of the initial saturation, which matches the result of the model well. Meanwhile, the predicted final saturation of the model is 0.515±0.023 which has around 1% deviation compared with the result of the experiment 0.510±0.017. It means this model could be used to guide structure design.

关 键 词：自发渗吸 多孔建筑材料 多相流 毛细吸水系数 

分 类 号：TU5[建筑科学—建筑技术科学]