Carbon nanotube glycol nanofluids: Photo-thermal properties, thermal conductivities and rheological behavior  

作　　者：Zhaoguo Meng Daxiong Wu Liangang Wang Haitao Zhu Qingling Li 

机构地区：[1]College of Materials Science&Engineering,qingdao University of Science&Teehnology,Qingdao 266042,China [2]College of Electromechanical Engineering,Qingdao University of Science&Technology,Qingdao 266042,China

出　　处：《Particuology》2012年第5期614-618,共5页颗粒学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51172117 and 51176080);the Shandong Natural Science Foundation(ZR2010EM035);the Qingdao Science and Technology Project(10-3-4-4-12-jch)

摘　　要：The efficiency and effectiveness of solar energy capture and storage are to a large extent functions of the heat transfer and storage capacity of the medium used. This paper investigates the potential of using carbon nanotube （CNT）-glycol nanosuspension as such a medium, prepared by freeze dryingultrasonic dispersing after oxidation treatment with HNO3. The influences of the mass fraction of CNTs glycol nanofluids and temperatures on photo-thermal properties, thermal conductivities and rheological behavior were investigated. The results show that CNTs with oxidation treatment exhibited good dispersing performance. Strong optical absorption of the CNTs glycol nanofluids was detected in the range of 200-2500 nm. At room temperature, 18% enhancement was found in the photo-thermal conversion efficiency of the 0.5% mass fraction CNTs glycol nanofluids in comparison to the basic fluids, without significant increase in viscosity. At 55 ℃, CNTs glycol nanofluids with 4.0% mass fraction exhibited much lower viscosity and 25.4% higher thermal conductivity in comparison to that of pure glycol at room temperature.The efficiency and effectiveness of solar energy capture and storage are to a large extent functions of the heat transfer and storage capacity of the medium used. This paper investigates the potential of using carbon nanotube （CNT）-glycol nanosuspension as such a medium, prepared by freeze dryingultrasonic dispersing after oxidation treatment with HNO3. The influences of the mass fraction of CNTs glycol nanofluids and temperatures on photo-thermal properties, thermal conductivities and rheological behavior were investigated. The results show that CNTs with oxidation treatment exhibited good dispersing performance. Strong optical absorption of the CNTs glycol nanofluids was detected in the range of 200-2500 nm. At room temperature, 18% enhancement was found in the photo-thermal conversion efficiency of the 0.5% mass fraction CNTs glycol nanofluids in comparison to the basic fluids, without significant increase in viscosity. At 55 ℃, CNTs glycol nanofluids with 4.0% mass fraction exhibited much lower viscosity and 25.4% higher thermal conductivity in comparison to that of pure glycol at room temperature.

关 键 词：NanofluidsCNTsPhoto-thermal conversionRheological behaviorThermal conductivity 

分 类 号：TQ223.162[化学工程—有机化工] TK124[动力工程及工程热物理—工程热物理]