Thermal Conductivity Measurements of Granular and Powdered Silica Aerogel Super Insulation Materials at Different Temperature and Pressures with THS Method
This paper dedicates to the experimental determination of thermal conductivity of powdered and granular silica aerogels with the transient hot-strip (THS) method.A vacuum furnace is designed for the THS method in order to measure the thermal conductivity at different temperature and pressures.The specific surface area and average mesopore diameter of two samples were also measured by cryogenic nitrogen adsorption method.The results show that the thermal conductivity of the two samples demonstrates similar patterns with variation of pressure,which are generally in agreement with the granular data in literature There exists a turning point at about 1000Pa for thermal conductivity with variation of pressure The thermal conductivity drops slowly when p > 1000 Pa,but drops quickly when air pressure is lower than 1000 Pa.The thermal conductivity of measured samples increases distinctly with elevation of temperature.In addition,the thermal conductivity rises with increase of average pore size at a certain temperature range.
thermophysical properties thermal conductivity transient hot-strip method aerogel Nanoporous insulation materials
Wang Lixin Wei Gaosheng Du Xiaoze Yang Yongping
School of Energy, power and Mechanical Engineering, Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing, 102206, China
国际会议
The 12th International Vacuum Insulation Symposium (IVIS 2015)(第十二届国际真空绝热材料会议)
南京
英文
284-291
2015-09-01（万方平台首次上网日期，不代表论文的发表时间）