Natural convective flow in circular and arc cavities filled with water-cu nanofluid: a comparative study

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2018-06-28 DOI:10.3329/JNAME.V15I1.33549

K. F. U. Ahmed, R. Nasrin, M. Elias

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引用次数: 8

Abstract

The fluid flow and heat transfer mechanism on steady state solutions obtained in circular and arc-square enclosures filled with water/Cu nanofluid as well as base fluid has been investigated numerically by Galerkin's weighted residual finite element procedure. The left and right boundaries of the cavities are, respectively, heated and cooled at constant temperatures, while their horizontal walls are adiabatic. Effects of buoyancy force (Rayleigh number) and viscous force (Prandtl number) with a wide range of Ra (103 - 106) and Pr (4.2 - 6.2) on heat transfer phenomenon inside cavities are observed. The fluid flow and temperature gradient are shown by streamlines and isotherms patterns. From the investigation, it is reported that the Rayleigh and Prandtl numbers are playing significant role in heat transfer rate. The variation in heat transfer is calculated in terms of average Nusselt number. Heat transfer rate is found to be higher for water/Cu nanofluid with 2% solid volume fraction than pure water. About 2.7% higher heat transfer rate is obtained for circular cavity than that of arc cavity using water/Cu nanofluid at Ra = 104 and Pr = 5.8.

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水-铜纳米流体填充的圆形和弧形腔内自然对流的比较研究

采用Galerkin加权残差有限元方法，对充水/铜纳米流体和基底流体的圆形和弧形方形外壳中稳态解的流体流动和传热机制进行了数值研究。空腔的左边界和右边界分别在恒定温度下加热和冷却，而它们的水平壁是绝热的。观察了浮力（瑞利数）和粘性力（普朗特数）在Ra（103-106）和Pr（4.2-6.2）宽范围内对空腔内传热现象的影响。流体流动和温度梯度通过流线和等温线模式显示。研究表明，瑞利数和普朗特数对传热速率起着重要作用。传热的变化是根据平均努塞尔数来计算的。固体体积分数为2%的水/Cu纳米流体的传热速率高于纯水。在Ra＝104和Pr＝5.8时，圆形腔的传热率比使用水/Cu纳米流体的弧形腔高出约2.7%。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.