Numerical study using a double grid to model the effect of the grooves of a vertical wall in a heated cavity on the natural convection of a nanofluid

IF 1.1 4区工程技术 Q4 THERMODYNAMICS Thermal Science Pub Date : 2023-01-01 DOI:10.2298/tsci211101037l

Zakaria Lafdaili, H. Mounir, Soufiane Nouari, Sakina El-Hamdani, L. Belarche

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Abstract

In this work we study numerically the natural convection of a carbon-based nanofluid (water + C60) in a differentially heated square cavity. One of the vertical walls of the cavity is grooved and maintained at a high temperature. The purpose of this work is to compare the effect of the macrostructural aspect of the grooves and the effect of the addition of fullerene nanoparticles (C60) to pure water on the heat exchange by natural convection in this type of geometry. To better quantify the convective heat exchange numerically near the grooves we used a refined grid with two non-conforming blocks at the hot wall level. The governing equations were discretized by the finite volume method using a power law scheme which offers a good stability characteristic in this type of flow. A numerical code was designed and produced in this context to use numerical simulation as an investigative tool. The results are represented in the form of streamlines and isothermal fields. The variation in the mean Nusselt number of the cold wall to the right of the cavity is calculated as a function of the volume fractions of the nanoparticles (0???0.06) for different numbers and sizes of the grooves and for different Rayleigh numbers (103 ? Ra ? 106).

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采用双网格模拟加热腔内垂直壁面沟槽对纳米流体自然对流的影响

在这项工作中，我们数值研究了碳基纳米流体(水+ C60)在差热方形腔中的自然对流。空腔的一个垂直壁开槽并保持在高温下。这项工作的目的是比较沟槽的宏观结构方面的影响和在纯水中添加富勒烯纳米粒子(C60)对这种几何形状的自然对流热交换的影响。为了更好地在数值上量化槽附近的对流换热，我们在热壁水平上使用了一个带有两个不一致块的精细网格。控制方程采用幂律格式用有限体积法离散，在这种流动中具有良好的稳定性。在这种情况下，设计并产生了一个数字代码，以使用数值模拟作为一种调查工具。结果以流线和等温场的形式表示。计算了不同凹槽数量和尺寸以及不同瑞利数(103 ?)时纳米颗粒体积分数(0?类风湿性关节炎?106)。

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来源期刊

Thermal Science 工程技术-热力学

CiteScore

2.70

自引率

29.40%

发文量

399

审稿时长

5 months

期刊介绍： The main aims of Thermal Science to publish papers giving results of the fundamental and applied research in different, but closely connected fields: fluid mechanics (mainly turbulent flows), heat transfer, mass transfer, combustion and chemical processes in single, and specifically in multi-phase and multi-component flows in high-temperature chemically reacting flows processes present in thermal engineering, energy generating or consuming equipment, process and chemical engineering equipment and devices, ecological engineering, The important characteristic of the journal is the orientation to the fundamental results of the investigations of different physical and chemical processes, always jointly present in real conditions, and their mutual influence. To publish papers written by experts from different fields: mechanical engineering, chemical engineering, fluid dynamics, thermodynamics and related fields. To inform international scientific community about the recent, and most prominent fundamental results achieved in the South-East European region, and particularly in Serbia, and - vice versa - to inform the scientific community from South-East European Region about recent fundamental and applied scientific achievements in developed countries, serving as a basis for technology development. To achieve international standards of the published papers, by the engagement of experts from different countries in the International Advisory board.