English

应用科学学报 ›› 2005, Vol. 23 ›› Issue (1): 94-98.

• 论文 • 上一篇    下一篇

被干燥多孔物料中孔隙大小及分布的探讨

葛仕福, 施明恒   

  1. 东南大学动力系, 江苏南京 210096
  • 收稿日期:2003-09-14 修回日期:2004-03-03 出版日期:2005-01-31 发布日期:2005-01-31
  • 作者简介:葛仕福(1962-),男,江苏盐城人,副教授,E-mail:gsf@mail.edu.cn;施明恒(1939-),男,江苏常熟人,教授,博导.
  • 基金资助:
    国家重点基础研究发展规划项目(G200026303)

A Study on the Void Distribution of Porous Materials Being Dried

GE Shi-fu, SHI Ming-heng   

  1. Department of Power Engineering, Southeast University, Nanjing 210096, China
  • Received:2003-09-14 Revised:2004-03-03 Online:2005-01-31 Published:2005-01-31

PDF

76

被引次数

14

摘要： 从多孔物料的微观结构出发,利用平衡湿含量的实验数据,对三十多种多孔建筑物料的孔隙分布规律进行了分析,结果表明其分布服从对数正态分布.得出了降速干燥阶段多孔物料孔隙中水液面蒸气相对分压与湿含量的关系式,计算值与实验值具有较好的一致性,均方根误差为3.01%.还分析了降速干燥阶段多孔物料中孔隙分布参数、温度、湿含量对其中水液面蒸气相对分压的影响.

关键词: 多孔建筑物料, 孔隙分布, 降速干燥, 孔隙液面蒸气分压

Abstract: Basing on the analysis of micro-structure and the experimental data of equilibrium moisture content of the porous construction materials, this paper studies the relationship between the equilibrium moisture content and the void distribution of porous materials.The results show that the void distribution obeys log arithmic normal function.According to this, the relation between the vapor pressure P(r)/PH and the moisture content of the porous materials in the falling rate drying period is obtained.The calculation result approximately agrees with the experimental data with only 3.01% root mean square error.In addition, the effects of the void distribution parameters μ, σ, the temperature and the moisture content on the vapor pressure P(r)/PH of the porous materials in the falling rate drying period are analyzed.The results can be used to study the heat and mass transfer of porous materials during the falling rate drying period.

Key words: falling rate drying, porous construction materials, void distribution, the vapor pressure inside the void

中图分类号: