化工进展2017，Vol.36Issue(11)：3947-3954,8.DOI:10.16085/j.issn.1000-6613.2017-0523
粗糙度对微细通道纳米流体临界热流密度(CHF)和不稳定性的影响
Effect of surface roughness on nanofluid critical heat fluxes (CHF) in rectangular microchannels and instability
摘要
Abstract
Saturated flow boiling heat transfer in rectangular microchannels with a hydraulic diameter of 1.24mm was experimentally investigated. Deionized water and 0.3％ Al2O3-H2O nanofluid were selected respectively as the working fluids. Rectangular microchannels' surface roughness was disposed firstly by acidic polishing process,further sonic frequency system(SFS)method was adopted to obtain the microscopic images of surface roughness,and then these images were gray-scale processing by means of MATLAB. Accordingly,three experimental rectangular microchannels whose surface roughness was 25.3、38.7 and 51.2 respectively were acquired. Contrastive study on the effect of different surface roughness on nanofluid critical heat fluxes(CHF)and instability in the process of saturated flow boiling heat transfer of deionized water and 0.3％Al2O3-H2O nanofluid was carried out. Results indicated that under the same experimental conditions,the CHF of 0.3％ Al2O3-H2O nanofluid can be increased by 18.37％—226.28％ than deionized water. With the increase of surface roughness,the CHF of both of them increases slightly,but the rising tendency of 0.3％Al2O3-H2O nanofluid shows more obvious.Through the comprehensive evaluation and analysis of massive experimental data,it was found that the increase of microchannels' surface roughness can make the instability of fluid in the microchannels increase.关键词
微细通道/纳米流体/表面粗糙度/临界热流密度/不稳定性Key words
microchannel/nanofluid/surface roughness/critical heat fluxes(CHF)/instability分类
能源科技引用本文复制引用
罗小平,李海燕..粗糙度对微细通道纳米流体临界热流密度(CHF)和不稳定性的影响[J].化工进展,2017,36(11):3947-3954,8.基金项目
国家自然科学基金项目（21776096) （）
