非牛顿流体在带凹槽的外圆柱体和内圆柱体间隙中的自然对流

IF 1.7 4区工程技术 Q3 THERMODYNAMICS

Heat Transfer Research Pub Date : 2023-12-01 DOI:10.1615/heattransres.2023050322

Oussama Benhizia, Mohamed Bouzit

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引用次数: 0

摘要

本文报告了对两个同心圆柱体之间稀释流体层流自由对流的数值研究。模拟是针对二维稳态进行的，为此使用了 ANSYS CFX 16.2。支配问题的参数取为 1≤n≤1.6、10≤Pr≤103、103≤Ra≤105，内圆柱体上添加了不同数量的凹槽（4、8、12、16）。我们详细解释了先例系数对流线、等温线、速度和无量纲温度的影响。雷利数增强了对流，在其他参数设置不变的情况下，对流的对流通过增加努塞尔特数来实现；此外，这里的重要现象（凹槽的影响）将在讨论部分占很大比重。当凹槽达到一定数量且 n 较高时，流体会变得僵硬，热量传递模式将纯粹依靠传导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

NATURAL CONVECTION OF NON NEWTONIAN DILATANT FLUID IN THE GAP BETWEEN AN OUTER CYLINDER AND INNER CYLINDER WITH GROOVES

This paper reports a numerical study of the laminar free convection of dilatant fluid between two concentric cylinders. The simulations have been performed for the two dimensional steady state and the ANSYS CFX 16.2 was used for that objective. The governing problem parameters are taken as 1≤n≤1.6, 10≤Pr≤103, 103≤Ra≤105 and different number of grooves added to the inner cylinder (4, 8, 12, 16). We give detailed explanations on the effects of the precedent coefficients on the streamlines, isotherms, velocity and dimensionless temperature. The Rayleigh number strengthens the convective flow which refers by increasing in the Nusselt number at the same set of the other parameters; Also, the important phenomenon here (effects of the grooves) will have a large part from the discussion section. When the grooves accomplished a given number and n is high, the fluid is stiff and the heat transfer mode is purely by conduction.

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来源期刊

Heat Transfer Research 工程技术-热力学

CiteScore

3.10

自引率

23.50%

发文量

102

审稿时长

13.2 months

期刊介绍： Heat Transfer Research (ISSN1064-2285) presents archived theoretical, applied, and experimental papers selected globally. Selected papers from technical conference proceedings and academic laboratory reports are also published. Papers are selected and reviewed by a group of expert associate editors, guided by a distinguished advisory board, and represent the best of current work in the field. Heat Transfer Research is published under an exclusive license to Begell House, Inc., in full compliance with the International Copyright Convention. Subjects covered in Heat Transfer Research encompass the entire field of heat transfer and relevant areas of fluid dynamics, including conduction, convection and radiation, phase change phenomena including boiling and solidification, heat exchanger design and testing, heat transfer in nuclear reactors, mass transfer, geothermal heat recovery, multi-scale heat transfer, heat and mass transfer in alternative energy systems, and thermophysical properties of materials.