Role of Brownian motion in the enhanced thermal conductivity of nanofluids

2020-02-09 12:05:38

conductivity thermal solid suspensions dependent

责任者: Jang, S.P.;Choi, S.U.S. 单位: Energy Technol. Div., Argonne Nat. Lab., IL, USA 来源出处: Applied Physics Letters(Appl. Phys. Lett. (USA)),2004/05/24,84(21):4316-18 摘要: We have found that the Brownian motion of nanoparticles at the molecular and nanoscale level is a key mechanism governing the thermal behavior of nanoparticle-fluid suspensions (nanofluids). We have devised a theoretical model that accounts for the fundamental role of dynamic nanoparticles in nanofluids. The model not only captures the concentration and temperature-dependent conductivity, but also predicts strongly size-dependent conductivity. Furthermore, we have discovered a fundamental difference between solid/solid composites and solid/liquid suspensions in size-dependent conductivity. This understanding could lead to design of nanoengineered next-generation coolants with industrial and biomedical applications in high-heat-flux cooling 关键词: alumina;Brownian motion;composite materials;copper compounds;nanoparticles;particle size;suspensions;thermal conductivity;Brownian motion;enhanced thermal conductivity;nanofluids;dynamic nanoparticles;thermal properties;nanoparticle-fluid suspensions;temperature dependent conductivity;size dependent conductivity;solid/solid composites;solid/liquid suspensions;nanoengineered coolants;biomedical applications;industrial application;heat flux cooling;Al2O3;CuO