化工进展2016，Vol.35Issue(12)：3763-3770,8.DOI:10.16085/j.issn.1000-6613.2016.12.005
微细通道纳米制冷剂流动沸腾阻力特性
A study on flow boiling resistance of nanorefrigerant in rectangular microchannels
摘要
Abstract
The flow boiling characteristics were experimentally investigated through the aluminum-based rectangular microchannels with a hydraulic diameter of 1333m,using Al2O3-R141b nanorefrigerants with a different partical of 0.2%,0.5% and 0.8%(mass fraction) and pure refrigerant as the working fluids. The effect of concentration on the two-phase frictional pressure drop were investigated by comparing the surface energy of heat transfer surface before and after experiment. Results showed that when nanorefrigerants with a different particles of 0.2%,0.5% and 0.8% were working fluids,the two-phase frictional pressure drop was lower than pure refrigerant under the same experimental conditions,and the biggist drop were 11.6%,14.8% and 19.2%. Nanoparticles adhered to the surface after experiment and increased the surface energy of heat transfer surface by 1.26 times, 1.44 times and 1.91 times,respectively. It reduced the roughness and improved the surface wettability of heat transfer surface,made two-phase frictional pressure drop decrease. Based on the comparison of experimental data with predicted value of models,modified Qu-Mudawar,the new correlation had a better predict ability. The mean absolute error decreased to 9.78%.关键词
微细通道/纳米制冷剂/两相摩擦压降/表面能Key words
microchannels/nanorefrigerant/two-phase frictional pressure drop/surface energy分类
能源科技引用本文复制引用
罗小平,张霖,刘波..微细通道纳米制冷剂流动沸腾阻力特性[J].化工进展,2016,35(12):3763-3770,8.基金项目
国家自然科学基金项目（21276090）。 （）
