摘要
对梯形封闭腔内Al2O3-EG纳米流体自然对流传热进行了数值模拟,讨论了封闭腔尺寸比、瑞利数、纳米颗粒体积分数以及布朗运动对自然对流流动与传热特性的影响。数值模拟结果表明在考虑布朗运动时,腔体尺寸比与瑞利数对流动传热均有很大影响,且尺寸比为0.5时,对流换热平均Nusselt数达到最大值。随着纳米颗粒体积分数的增加,纳米流体换热效果逐渐增强;但当忽略布朗运动时,添加纳米颗粒削弱了换热效果。
A numerical study was conducted to investigate the natural convection and heat transfer of trapezoidal filled with A12O3 - EG nanofluid. The effects of the following factors such as aspect ratio of enclosure, Rayleigh number, sol-id volume fraction and Brownian motion were discussed. The results showed that when Brownian motion was considered in the analysis, both aspect ratio and Rayleigh number had significant effects on characteristics of heat transfer perform ance and the heat transfer rate reached its maximum value when the aspect ratio was 0.5. The effect of heat transfer was strengthened with increasing volume fraction. But this was in contradiction to the results of the analysis in which Brownian motion was neglected.
出处
《能源工程》
2014年第1期1-6,共6页
Energy Engineering
基金
国家自然科学基金青年项目(51106144)
