方腔内EG/H2O-ZnO纳米流体自然对流特性模拟研究

摘要

纳米流体具有良好导热性能,可被用来作为传热工质,提高传热系统工作效率.本文采用格子玻尔兹曼方法对乙二醇/水基ZnO纳米流体自然对流特性进行了模拟研究,对比了不同温度分布函数对模拟结果的影响.可以看出,在高瑞利数下,采用D2G9T9模型计算方腔内流场的矢量图中出现了更为明显的漩涡.通过与实验数据对比可以看出,采用D2G9T9模型得到的结果更为精确.%Nanofluid can be used as heat transfer medium to improve the heat transfer efficiency of the system with good thermal conductivity.The article makes simulation on thenatural convection heat transfer of ethylene glycol/aqueous ZnO nanofluids by Lattice Boltzmann methodand compares the effect of different temperaturedistribution function on the simulation results.It can be seen that there is more swirls in square cavity flow field vectors,which is calculated by D2G9T9 model under the high Rayleigh number.Compared with experimental data,the simulation results of D2G9T9 model is more accurate.