SiC-水纳米流体在微小通道中的流动和换热特性  

Flow and Heat Transfer Characteristics of Water-based Si C Nanofluids Inside Minichannel

作　　者：赵耀华[1] 张艳妮[1] 刁彦华[1] 张冀[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《北京工业大学学报》2015年第7期1085-1092,共8页Journal of Beijing University of Technology

基　　金：北京市自然科学基金重点项目资助(Z1004020201201)

摘　　要：为了解决传统换热工质导热系数和传热性能不高的问题,以Si C-水纳米流体为工质,研究了不同体积分数（0.001%、0.005%、0.01%、0.1%、1%）的Si C-水纳米流体在多孔微通道平行流扁管中的单相流动和换热特性.该扁管矩形通道的水力直径为2.08 mm,实验Re大约为150~5 200.研究结果表明：随着体积分数的增加,纳米流体的Nu呈现先增长后下降的趋势;体积分数为0.01%的Si C-水纳米流体在Re≈5 200时,Nu增长最大,增长率达到80.8%;纳米流体起到强化换热效果的同时,伴随着阻力增加.In order to solve the problem of lower thermal conductivity and heat transfer performance, the single-phase flow and heat transfer characteristics of nanofluids with different volume fraction （ ranging from 0. 001% to 0. 1%） inside the multiport mini-channel flat tube （ MMFT） was investigated. Water-based SiC nanofluids was used as the working fluid. The hydraulic diameter of the flat tube’ s rectangular channel was 2. 08 mm and the Reynolds number varied from 150 to 5 200 approximately. The experimental results indicate that the Nusselt number increases at the beginning and drops later with the increase of volume concentration. When the Reynolds number reaches to 5 200, the largest growth rate of Nusselt number runs up to 80. 8% at a volume fraction of 0. 01% compared with the results of base fluid. Results also show that there are smaller increase in resistance , along with the enhancement of heat transfer effect.

关 键 词：纳米流体 微小通道 体积分数 强化换热 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]