Enhancement of natural convection heat transfer in concentric annular space using inclined elliptical cylinder

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
H. Laidoudi
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引用次数: 17

Abstract

The governing equations of continuity, momentum and energy are numerically solved to study the laminar natural convection heat transfer of Newtonian fluid confined within two concentric cylinders. The inner cylinder is elliptical cross-section with different aspect ratio E = 0.1 to 0.5 and it is considered to be hot, whereas the outer cylinder is circular and it is supposed to be cold.    The annular spacing between the cylinders is defined based on radii ratio (RR = 2.5). Also, the inner cylinder is inclined with an inclination angle (θ = 0 to 90). The main purpose of this study is to determine the effects of inclination angle (θ = 0° to 90°), aspect ratio of inner cylinder (E = 0.1 to 0.5), Prandtl number (Pr = 0.71 and 7.01) and Rayleigh number (Ra = 103 to 105) on fluid flow and heat transfer rate. The flow patterns and temperature distributions are potted in terms of streamlines and isotherms respectively. The obtained results showed that increase in inclination angle enhances the heat transfer rate of inner cylinder for all values of aspect ratio. Also, for the inclination angle          (θ = 90°), the decrease in aspect ratio (E) improves the heat transfer rate of inner cylinder.
利用倾斜椭圆柱增强同心环形空间的自然对流换热
数值求解了连续性、动量和能量的控制方程,研究了牛顿流体在两个同心圆柱体内的层流自然对流换热。内圆柱体是椭圆形横截面,具有不同的纵横比E=0.1至0.5,并且被认为是热的,而外圆柱体是圆形的,并且被假设是冷的。圆柱体之间的环形间距是根据半径比(RR=2.5)确定的。此外,内圆柱体以倾角(θ=0至90)倾斜。本研究的主要目的是确定倾角(θ=0°至90°)、内筒纵横比(E=0.1至0.5)、普朗特数(Pr=0.71和7.01)和瑞利数(Ra=103至105)对流体流动和传热率的影响。流型和温度分布分别用流线和等温线表示。结果表明,在所有长宽比值下,倾角的增加都能提高内筒的传热率。此外,对于倾角(θ=90°),纵横比(E)的降低提高了内筒的传热率。
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
Accounts of Chemical Research
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.
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