Analysis of Natural Convective Flow of Casson Fluid around an Inclined Rectangular Cylinder

IF 1.4 4区 工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY Scientia Iranica Pub Date : 2023-08-30 DOI:10.24200/sci.2023.60747.6968
Olalekan Adebayo Olayemi, Tomisin Favour Ajide, Adebowale Martins Obalalu, Muneer A. Ismael
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Abstract

This paper presents the natural convection around a tilted hot cylinder immersed in Casson fluid and enclosed by a square container. The parameters of Casson fluid are set to be (0.1≤η ≤ 1.0), aspect ratio (0.1≤AR ≤ 0.7), tilt angle (0^°≤γ ≤ 90^° ) and Rayleigh number (10^3≤Ra ≤ 10^6) are inspected to reveal their influences on Casson fluid flow and heat transfer. The governing equations were solved with COMSOL Multiphysics 5.6 software. The walls of the enclosure and the cylinder are fixed as T_c and T_h. Findings are delineated as stream functions, isothermal contours, and average Nusselt numbers. The study reveals that for the range of η, AR and Ra investigated, the rate of heat transfer of the enclosure wall increases with increasing η, AR and Ra; while for the heated rectangular obstacle, the rate of heat transfer decreases with AR growth but improves with increasing η and Ra. At Ra=106, γ increment results in heat transfer enhancement for the enclosure and cylinder walls. For Ra in the interval of 10^3≤Ra ≤ 10^5, the response of the thermal profiles of both the rectangular cylinder and enclosure walls to cylinder orientation depends on the value of Ra and γ considered.
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卡森流体绕斜矩形圆柱自然对流流动分析
本文研究了浸没在卡森流体中并被方形容器包围的倾斜热圆柱体周围的自然对流。设置卡森流体的参数为(0.1≤η≤1.0)、长径比(0.1≤AR≤0.7)、倾角(0^°≤γ≤90°)和瑞利数(10^3≤Ra≤10^6),考察了这些参数对卡森流体流动和传热的影响。利用COMSOL Multiphysics 5.6软件求解控制方程。箱体壁和气缸壁分别固定为T_c和T_h。结果被描述为流函数、等温等高线和平均努塞尔数。研究表明:在η、AR和Ra范围内,壁面换热速率随η、AR和Ra的增大而增大;而对于加热后的矩形障碍物,传热速率随AR的增大而减小,随η和Ra的增大而增大。在Ra=106时,γ的增加导致壳体和柱壁的传热增强。当Ra在10^3≤Ra≤10^5区间内时,圆柱体和管壁的热廓线对圆柱体方向的响应取决于所考虑的Ra和γ的值。
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来源期刊
Scientia Iranica
Scientia Iranica 工程技术-工程:综合
CiteScore
2.90
自引率
7.10%
发文量
59
审稿时长
2 months
期刊介绍: The objectives of Scientia Iranica are two-fold. The first is to provide a forum for the presentation of original works by scientists and engineers from around the world. The second is to open an effective channel to enhance the level of communication between scientists and engineers and the exchange of state-of-the-art research and ideas. The scope of the journal is broad and multidisciplinary in technical sciences and engineering. It encompasses theoretical and experimental research. Specific areas include but not limited to chemistry, chemical engineering, civil engineering, control and computer engineering, electrical engineering, material, manufacturing and industrial management, mathematics, mechanical engineering, nuclear engineering, petroleum engineering, physics, nanotechnology.
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