内置扭带管Cu-水纳米流体的流动和传热特性

发布时间：2018-01-09 20:30

本文关键词：内置扭带管Cu-水纳米流体的流动和传热特性　出处：《东北电力大学学报》2016年01期 　论文类型：期刊论文

【摘要】：为了研究纳米流体在内置扭带管表面传热特性及流动特性,设计并建立一套纳米流体表面传热实验系统,Reynolds数(Re)在2 000-7 000的范围内,分别对质量分数为0.1%,0.3%和0.5%的Cu-水纳米流体在不同扭转比的内置扭带管中的传热特性进行实验研究。结果表明:随着Re增加,Cu-水纳米流体和去离子水的沿程阻力系数均减少;水的沿程阻力系数小于Cu-水纳米流体,内置扭带管的沿程阻力大于光管,且随着扭转比的增大而减少;Nusselt数(Nu)随Re和纳米颗粒质量分数的增大而增大;Cu-水纳米流体的Nu比水高,质量分数为0.5%的Cu-水纳米流体在Y=3.5与Y=5.5的内置扭带管的增强幅度分别为2.29与2.14;内置扭带管的Nu比光管大,且随扭转比增大而减少。
[Abstract]:In order to study the heat transfer characteristics and flow characteristics of nano-fluid on the surface of a twisted tube, a set of experimental system of surface heat transfer of nano-fluid was designed and established. The Reynolds number is in the range of 2 000 to 7 000, respectively, and the relative mass fraction is 0.1%. The heat transfer characteristics of Cu-water nanofluids with different torsion ratios were investigated by experiments in 0.3% and 0.5% Cu-water nanofluids with different torsion ratios. The results show that the heat transfer characteristics of Cu-water nanofluids increase with the increase of re. The resistance coefficient of Cu-water nano-fluid and deionized water is decreased. The resistance coefficient of water is smaller than that of Cu-water nanofluid, and the resistance of inner torsion tube is larger than that of light tube, and decreases with the increase of torsion ratio. The Nusselt number increases with the increase of re and nano-particle mass fraction. The Nu of Cu-water nano-fluid is higher than that of water, and the enhancement amplitude of Cu-water nano-fluid with mass fraction of 0.5% is 2.29 and 2.14 in the inner torsion tube of Yi-3.5 and Yi-5.5, respectively. The Nu of the inner torsion tube is larger than that of the light tube and decreases with the increase of the torsion ratio.
【作者单位】：东北电力大学能源与动力工程学院;
【分类号】：TK124;TB383.1
【正文快照】： 20世纪90年代以来,研究人员开始探索将纳米材料技术应用于强化传热领域,研究新一代高效传热冷却技术。1995年,美国Argonne国家实验室的Choi[1]等人首次提出了一个崭新的概念——“纳米流体”。近些年来,国内外学者对纳米流体技术进行了大量的研究,主要集中在以下几个方面[2-5]

【相似文献】