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

IF 1.2 Q3 ENGINEERING, MARINE

Journal of Naval Architecture and Marine Engineering 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%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Naval Architecture and Marine Engineering ENGINEERING, MARINE-

CiteScore

2.50

自引率

5.60%

发文量

审稿时长

20 weeks

期刊介绍： TJPRC: Journal of Naval Architecture and Marine Engineering (JNAME) is a peer reviewed journal and it provides a forum for engineers and scientists from a wide range of disciplines to present and discuss various phenomena in the utilization and preservation of ocean environment. Without being limited by the traditional categorization, it is encouraged to present advanced technology development and scientific research, as long as they are aimed for more and better human engagement with ocean environment. Topics include, but not limited to: marine hydrodynamics; structural mechanics; marine propulsion system; design methodology & practice; production technology; system dynamics & control; marine equipment technology; materials science; under-water acoustics; satellite observations; and information technology related to ship and marine systems; ocean energy systems; marine environmental engineering; maritime safety engineering; polar & arctic engineering; coastal & port engineering; aqua-cultural engineering; sub-sea engineering; and specialized water-craft engineering. International Journal of Naval Architecture and Ocean Engineering is published quarterly by the Society of Naval Architects of Korea. In addition to original, full-length, refereed papers, review articles by leading authorities and articulated technical discussions of highly technical interest are also published.