EFFECTS OF ROTATION ON UNSTEADY FLUID FLOW AND FORCED CONVECTION IN THE ROTATING CURVED SQUARE DUCT WITH A SMALL CURVATURE

IF 10.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL Facta Universitatis-Series Mechanical Engineering Pub Date : 2022-07-28 DOI:10.22190/fume210129041a
M. Hasan, R. K. Chanda, R. Mondal, G. Lorenzini
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引用次数: 5

Abstract

In recent years, the analysis of flow disposition in a curved duct (CD) has greatly attracted researchers because it is broadly used in engineering devices. In the present paper, unsteady flow characteristics of energy transfer (HT) in a rotating curved square duct (CSD) have been presented with the aid of spectral method. The key purpose of this study is to explore rotational effects and heat transfer (HT) of the duct. For this purpose, time-evolution calculation is performed over the Taylor number (-1500 ≤ Tr ≤ 1500) and other parameters are fixed; e.g., Dean number (Dn = 1000), Curvature (δ = 0.015) and Prandtl number (Pr = 7.0, for water). Firstly, time-dependent behavior is accomplished for both clockwise and anticlockwise rotations. It is found that the flow instabilities are certainly governed by the change of Tr that has been justified by sketching phase spaces (PS). To observe the flow features, velocities including axial flow (AF), secondary flow (SF) and temperature profiles are disclosed for both rotations; and it is elucidated that 2- to 6-vortex solutions are generated for physically realizable solutions. Axial flow (AF) shows that two maximum-velocity regimes are produced which induces secondary flow (SF), and, consequently, a strong bonding between the AF and SF has been built up. It is observed that as the rotation is increased, the fluid is mixed considerably which boosts HT in the fluid. Finally, an assessment between the numerical and experimental data has been given, and a good agreement is observed.
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旋转对旋转小曲率弯曲方管内非定常流体流动和强制对流的影响
近年来,由于弯曲管道在工程装置中的广泛应用,其流动配置分析备受关注。本文利用谱法研究了旋转弯曲方管内能量传递的非定常流动特性。本研究的主要目的是探讨管道的旋转效应和传热(HT)。为此,对泰勒数(-1500≤Tr≤1500)进行时间演化计算,其他参数固定;例如,Dean数(Dn = 1000),曲率(δ = 0.015)和Prandtl数(Pr = 7.0,对于水)。首先,实现了顺时针和逆时针旋转的时间依赖行为。通过对相空间(PS)的描述,证实了流动不稳定性是由Tr的变化决定的。为了观察流动特征,揭示了两种旋转下的轴向流(AF)、二次流(SF)和温度分布;并阐明了物理可实现的解可生成2 ~ 6涡解。轴向流(AF)表明,产生了两个最大速度区,从而引起二次流(SF),因此,在轴向流和二次流之间建立了牢固的结合。观察到,随着旋转的增加,流体的混合程度大大提高,从而提高了流体中的高温。最后,对数值与实验数据进行了比较,两者吻合较好。
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来源期刊
CiteScore
14.40
自引率
2.50%
发文量
12
审稿时长
6 weeks
期刊介绍: Facta Universitatis, Series: Mechanical Engineering (FU Mech Eng) is an open-access, peer-reviewed international journal published by the University of Niš in the Republic of Serbia. It publishes high-quality, refereed papers three times a year, encompassing original theoretical and/or practice-oriented research as well as extended versions of previously published conference papers. The journal's scope covers the entire spectrum of Mechanical Engineering. Papers undergo rigorous peer review to ensure originality, relevance, and readability, maintaining high publication standards while offering a timely, comprehensive, and balanced review process.
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