吸潮多孔材料单侧受热下湿分输运过程数值模拟  

Numerical Simulation of Moisture Transfer in Wet Porous Material During One-sided Heating

作　　者：孙金昊 姜培学[1] 李季 胥蕊娜[1] SUN Jin-Hao;JIANG Pei-Xue;LI Ji;XU Rui-Na(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Beijing Mechanical and Electrical Engineer Designing Department,Beijing 100854,China)

机构地区：[1]热科学与动力工程教育部重点实验室,清华大学能源与动力工程系,北京100084 [2]北京机电工程总体设计部,北京100854

出　　处：《工程热物理学报》2021年第6期1569-1574,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金优秀青年基金项目(No.51722602);国家自然科学基金创新研究群体项目(No.51621062)。

摘　　要：多孔材料常用于飞行器舱室表面结构,而其暴露在空气中时容易吸附湿分。对低含湿材料舱室,在外侧受热情况下,材料内部湿分会发生相变形成蒸汽向舱室内腔输运,从而影响舱室内部电子仪器的正常工作。本文通过开展基于多相混合物模型的数值模拟研究,研究了单侧受热情况下吸潮多孔材料内部的湿分输运过程,揭示了低含湿多孔材料内部的湿分输运机理及影响因素,并预测内侧非受热表面的进水量。计算结果表明,材料孔隙率及孔隙尺寸对进水量影响较小,而渗透率影响显著。较低的渗透率使得向非受热表面输运并冷凝的蒸汽量增加,最终致使进入舱内的蒸汽量增加。本文讨论了多孔材料特性对单侧受热过程湿分输运的影响机理,为减小吸潮影响的材料改进方向提供了依据。Porous materials are widely applied in the surface structure of aircraft chambers.Moisture are adsorbed on the porous material when it is exposed to air.The moisture in wet material will evaporate during heating,and the vapor may be transferred to the inner side of the material under low initial water content,which may lead to potential danger for devices inside the chamber.In this paper,a numerical simulation is developed for the moisture transfer in one-sided heated porous media with low initial moisture content,the moisture transfer process and its influence factors analyzed.The permeability has significant negative effect on the vapor mass transferred in the unheated surface,while porosity and pore size only have slight influence.The simulation results show that vapor tends to transferring to the inner cooler side and condensate under low permeability,which will attribute to the increasing vapor mass transferred inside the chamber.The effect of porous material properties on moisture transfer during one-sided heating is discussed in this paper,which contributes to the direction of material improvement for reducing the influence of moisture.

关 键 词：吸潮多孔材料 湿分输运 多相混合 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]