物理学报Issue(2)：1-9,9.DOI:10.7498/aps.64.024703
方腔内Cu/Al2O3水混合纳米流体自然对流的格子Boltzmann模拟∗
Numerical simulation of natural convection of square enclosure filled with Cu/Al2O3-water mixed nanofluid based on lattice Boltzmann metho d
摘要
Abstract
As an effective heat transfer medium, Nanofluid is used widely in heat transfer field. However, due to the contra-diction between the heat conductivity coefficient of nanofluid and the cost of nanoparticles, a new mixed nanofluid is developed. In order to investigate the natural convection heat transfer characteristics and the interaction mechanism between nanoparticles, the lattice Boltzmann equations of nanofluid flow and temperature fields are deduced by multi-scale technique based on considering the interaction forces between nanoparticles, and the lattice Boltzmann model of Cu/Al2O3-water mixed nanofluid is established by coupling the evolution equations of flow with temperature fields. Nanoparticles distribution in enclosure and interaction forces between nanoparticles are investigated, it is found that Brownian motion force is far bigger than any other forces, and the effects of temperature difference driving force and Brownian motion force on nanoparticles distribution are biggest. In addition, the effects of nanoparticles fractions and Rayleigh number on natural convection are investigated, and the natural convection heat transfer characteristics of mixed nanofluid (Cu/Al2O3-water) are compared with those of single metal nanoparticle nanofluid (Al2O3-water). It is found that the mixed nanofluid has a higher heat transfer characteristic than other common nanofluid.关键词
混合纳米流体/颗粒间相互作用力/格子Boltzmann模型/自然对流Key words
mixed nanofluid/interaction forces between nanoparticles/lattice Boltzmann model/natural convection引用本文复制引用
齐聪,何光艳,李意民,何玉荣..方腔内Cu/Al2O3水混合纳米流体自然对流的格子Boltzmann模拟∗[J].物理学报,2015,(2):1-9,9.基金项目
中央高校基本科研业务费专项资金(批准号:2014QNA23)资助的课题.@@@@* Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No.2014QNA23) （批准号:2014QNA23）
