Heat transfer and entropy investigation of non-Newtonian nanofluid mixed convection in a cubic cavity with a wavy bottom wall under the influence of a magnetic field

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-04-29 DOI:10.1016/j.csite.2025.106222

Obai Younis , Aissa Abderrahmane , Ali B.M. Ali , Ahmed Rashad , Sameh E. Ahmed , Abed Mourad , Soheil Salahshour , Maboud Hekmatifar , Kamel Guedri

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Abstract

1)Background

This article reports 3D simulations of nanofluid motion within a three-dimensional cubic cavity occupied with a permeable medium. It was supposed that the motion region holds a hot spinning cylinder and has a wavy bottom plane with various undulation values. Also, the domain was separated into two levels., namely, the permeable layer and the power-law nanofluid layer.

2)Methods

The worked mixture is a non-Newtonian liquid, and the magnetic impacts are analyzed. The (FEM) with a triangle-shaped part form was used to resolve the governing formulas. The results were demonstrated for a variety of motion factors, including the cylinder's angular velocity (

Ω

= 0 to 2000), Hartmann number (Ha= 0-10), power-law index (n= 0.8, 1 and 1.4), and undulation numbers (N= 1 to 4). The effects of the different factors on motion, heat transmission, and entropy formation are illustrated in stream function, isotherms, and isentropic contours. Increased amounts of

Ω

, Da, N, φ, besides decreased values of Ha, enhance the heat transmission.

3)Significant Findings

The majority of entropy production is caused by heat transmission.; though liquid resistance and magneto impact also influence it.

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非牛顿纳米流体混合对流在磁场影响下的传热和熵研究

本文报道了纳米流体在具有渗透性介质的三维立方腔内运动的三维模拟。假设运动区域为热纺丝筒，具有具有不同波动值的波状底平面。此外，域被划分为两个层次。2)方法将加工后的混合物为非牛顿液体，对其进行磁冲击分析。采用三角形零件形式的有限元法求解控制公式。结果证明了各种运动因素，包括圆柱的角速度（Ω = 0至2000），哈特曼数（Ha= 0-10），幂律指数（n= 0.8, 1和1.4）和波动数（n= 1至4）。流函数、等温线和等熵等高线说明了不同因素对运动、传热和熵形成的影响。Ω、Da、N、φ的增加，以及Ha的减小，都增加了传热。3)显著性发现：大部分熵产是由传热引起的。尽管液体阻力和磁冲击也会影响它。

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

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.