田波,余霞光,王丽伟,王如竹

• 1:上海交通大学制冷与低温工程研究所

摘要(Abstract)：

对膨胀石墨在不同膨胀温度及不同膨胀时间下进行了膨胀工艺与导热系数测试的研究。研究中,分别用平面热源法和称重法测出不同膨胀条件下石墨的导热系数和密度。然后根据导热系数最优化的原则,结合未膨胀晶体的观测状态以及密度的变化,找出膨胀石墨的最佳膨胀工艺。结果发现膨胀石墨在各个膨胀温度下都存在着自己的最佳膨胀工艺。经过不同膨胀温度条件下同等密度样品的对比发现,膨胀温度在600℃时膨胀10 min导热系数达到了最大值,其值为0.09498 W·(m·K)-1。这个值相对于500℃、700℃以及800℃的最优导热系数值,分别提高了5.5%、16.4%和27.9%。

关键词(KeyWords)： 膨胀石墨;平面热源法;膨胀;导热系数

Abstract:

Keywords:

基金项目(Foundation): 优博专项资金资助;; 国家自然科学基金重点项目(50736004)

作者(Author): 田波,余霞光,王丽伟,王如竹

参考文献(References)：

• [1]SU Tong-fu(苏同福).Expanded Graphite literature on the subject profile(膨胀石墨专题文献概况)[J].Anyang Teachers College(安阳师专学报),1999(4):119-121.
• [2]WANG Ru-zhu(王如竹),WANG li-wei(王丽伟),WU Jing-yi(吴静怡).Theory and Application of Adsorption Refrigeration(吸附式制冷理论与应用)[M].Beijing(北京):Science Press(科学出版社),2007.
• [3]FANG Li-guo(方立国),WANG Li-jun(汪立军),ZHU Dong-sheng(朱冬生),et al.Mass and heat transfer enhancement of adsorbent in adsorption refrigeration(吸附式制冷中吸附剂传热传质的强化)[J].J Chem Eng of Chinese Univ(高校化学工程学报),1998,12(1),17-22.
• [4]Klein H P,Groll M.Heat transfer characteristics of expanded graphite matrices in metal hydride beds[J].International Journal of Hydrogen Energy,2004,29(14):1503-1511.
• [5]Mauran S,Lahmidi H,Goetz V.Solar heating and cooling by a thermochemical process.First experiments of a prototype storing 60 kW?h by a solid/gas reaction[J].Solar Energy,2008,82(7):623-636.
• [6]Wang K,Wu J Y,Wang R Z,et al.Composite adsorbent of CaCl2 and expanded graphite for adsorption ice maker on fishing boats[J].International Journal of Refrigeration,2006,29(2):199-210.
• [7]Eun T H,Song H K,Han J H,et al.Enhancement of heat and mass transfer in silica-expanded graphite composite blocks for adsorption heat pumps:Part I.Characterization of the composite blocks[J].International Journal of Refrigeration,2000,23(1):64-73.
• [8]Ahmet S,Ali K.Thermal conductivity and latent heat thermal energy storage characteristics of paraffin/expanded graphite composite as phase change material[J].Applied Thermal Engineering,2007,27(8-9):1271-1277.
• [9]HUANG Du-zi(黄犊子),FAN Quan-shi(樊栓狮).Experimental study of thermal conductivity measurement with HOT DISK(采用HOT DISK测量材料导热系数的实验研究)[J].J Chem Ind and Eng(China)(化工学报),2003,54(1):67-70.