摘要
将Cu-水纳米流体作为冷流体,应用到板式换热器系统中,利用大型通用CFD软件对不同浓度Cu-水纳米流体板式换热系统进行三维数值模拟,得到传热工质的温度场、换热系数及流场的空间分布,分析了Cu-水纳米流体在板式换热器中流动与传热特性,并将模拟结果与实验结果进行了对比。结果表明:以Cu-水纳米流体为冷流体的板式换热器的换热效果明显优于以纯水为冷流体时的换热效果;在提高纳米流体流速、增大纳米流体浓度的同时,应充分考虑其粘度增加导致的压降增大对换热器性能的影响。
As a cold fluid,the Cu-water nano-fluid was applied in a plate type heat exchanger system and a large-scale universal CFD( computational fluid dynamics) software was used to perform a three dimensional numerical simulation of a Cu-water nano-fluid plate type heat exchange system at various concentrations and obtain the distribution in a space of the temperature field,heat exchange coefficient and flow field of the working medium for heat transfer. On this basis,the flow and heat transfer characteristics of the Cu-water nano-fluid inside a plate type heat exchanger were analyzed and the simulation results were compared with the test ones. It has been found that the heat exchange effectiveness of the plate type heat exchanger with Cu-water nano-fluid serving as the cold fluid is obviously superior to that with pure water serving as the cold fluid,however,at the same time of increasing the flow speed and concentration of the nano-fluid,full attention should be paid to the influence of the increase of the pressure drop arisen from an increase of the viscosity on the performance of the heat exchanger.
出处
《热能动力工程》
CAS
CSCD
北大核心
2015年第5期666-671,816-817,共6页
Journal of Engineering for Thermal Energy and Power
基金
教育部新世纪优秀人才支持计划项目(NCET-2012-0727)
关键词
纳米流体
传热
流动
板式换热器
nano-fluid,numerical simulation,heat transfer,flow
