| 陈磊,王树刚,张腾飞,房天宇.剧烈变温环境下保温材料除湿过程数值模拟[J].,2017,57(4):345-351 |
| 剧烈变温环境下保温材料除湿过程数值模拟 |
| Numerical simulation on dehydration process in thermal insulation material subject to severe temperature change environment |
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| DOI：10.7511/dllgxb201704003 |
| 中文关键词: 保温材料 Darcy渗流 水分积聚 除湿率 |
| 英文关键词: thermal insulation materials Darcy seepage moisture accumulation dehydration rate |
| 基金项目:“九七三”国家重点基础研究发展计划资助项目(2012CB720105). |
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| 中文摘要: |
| 基于Darcy渗流扩展模型，并结合体积平均假设构建能量及质量守恒方程，模拟剧烈变温环境下保温材料的除湿过程．分别采用相对湿度20%(24 ℃)及干空气两种送风方式对该种保温材料的对流除湿过程进行数值模拟，进而讨论不同时刻温度、水蒸气浓度、液态水及冰的变化规律．研究表明，Darcy渗流扩展模型可以较好地反映出多孔保温材料在表面气流冲刷条件下其内部水蒸气的非线性流动特性，同时两种送风方式均可有效降低多孔保温材料因剧烈温变而引起的水分积聚，其相应的除湿率可分别达到70%和90%． |
| 英文摘要: |
| Based on the extended Darcy seepage model, the energy and mass conservation equations are coupled together by volume average hypothesis to simulate the dehydration process in thermal insulation material subject to severe temperature change environment. The mathematical model is developed to simulate the process of convection dehydration by air of 20% relative humidity (at 24 ℃) and dry air respectively. The changing regularities of the temperature, water vapor concentration, liquid water and ice at different time are analyzed. The research results show that the extended Darcy seepage model can reflect the nonlinear flow characteristics of water vapor during air flows over the porous thermal insulation materials. Two kinds of ventilation modes can effectively reduce moisture accumulation in the porous thermal insulation materials subject to severe temperature change environment, and the dehydration rate can reach 70% and 90% respectively. |
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