中南大学学报（自然科学版）2012，Vol.43Issue(8)：3000-3006,7.
微通道内纳米流体换热与压降特性
Heat transfer and pressure drop of Al2O3 nanofluids in microchannels
摘要
Abstract
The single-phase and two-phase flow and heat transfer characteristics were experimentally investigated through the aluminum-based rectangular microchannels with different hydraulic diameter of 0.923 1, 1.333 3 and 2.000 0 mm, using A12O3-H2O nanofluids with particle of 0, 0.1% and 0.5% (volume fraction) as the working fluids. The effect of the Reynolds number, the heat flux density, the size of the channel and the nanoparticle concentration on the pressure drop and convective heat transfer were investigated. The results show that the Nusselt number increases considerably as the nanoparticle volume fraction increases slightly but causes little extra pressure drop. The heat transfer coefficient of nanofluid rises by 18% than that of deionized water in 2.0 mm width channel. The heat transfer coefficient in 0.6 mm width channel is double higher than that in 2.0 mm width channel. With the decrease of the channel width, the pressure drop rises rapidly. The pressure drops of fluids in 0.6 and 1.0 mm width channels are 23.3 and 4.4 times of that in 2.0 mm width channel, respectively (Re=800). The pressure drop and flow friction of the nanofluids are also influenced by the heat flux density and mass velocity.关键词
微通道/纳米流体/阻力特性/换热系数/热流密度Key words
micro-channel/nanofluid/resistance characteristic/heat transfer coefficient/heat flux density分类
能源科技引用本文复制引用
宁常军,罗小平..微通道内纳米流体换热与压降特性[J].中南大学学报（自然科学版）,2012,43(8):3000-3006,7.基金项目
国家自然科学基金资助项目(20676039) （20676039）
