Thermal Diffusion in Jammed Aluminum Nanopowders
Nanoparticles show a variety of size-dependent properties due to the dramatic changes in the ratio of surface area to volume.The characteristics of nanoparticles different from the bulk material make the properties of the powders composed of these nanoparticles attract more attention.The heat transfer in the powder composed of nanoparticles is experimentally investigated in this paper.The powder is wrapped up in the slender tube made of insulating material.One end of the slender tube filled with powder is maintairied at low temperature and the other end is kept at room temperature.The temperature histories at two different locations in the slender tube are recorded using thermalcouples.The results show that the heat transfer depends on the bed porosity and the thermal conductivities of the solid and the gas.The pressure on the Al powders enhances the rate of heat transport due to the decrease of the bed porosity and a small fraction of gas.
Jammed powder Thermal diffusion Nanoparticle
C.Y.Ho C.Ma F.M.Sui
Department of Mechanical Engineering, Hwa Hsia Institute of Technology, Taipei 235, Taiwan
国际会议
台湾
英文
1809-1812
2011-12-11（万方平台首次上网日期，不代表论文的发表时间）