Hydro-thermal analysis of magnetize nanofluid inside pyramid shape enclosure under the effect of non-uniform heating

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-04-12 DOI:10.1016/j.csite.2025.106105

Muhammad Aqib Aslam , Lele Yang , Xiaodong Chen , Hasan Shahzad , Ke Zhang

{"title":"Hydro-thermal analysis of magnetize nanofluid inside pyramid shape enclosure under the effect of non-uniform heating","authors":"Muhammad Aqib Aslam , Lele Yang , Xiaodong Chen , Hasan Shahzad , Ke Zhang","doi":"10.1016/j.csite.2025.106105","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigates the heat transfer enhancement in a non-uniform magnetize nanofluid flow inside a pyramid shape cavity with hot circular obstacle. Non-uniform heating is applied at the bottom wall, and scaling is used to convert the governing equations into dimensionless form. The Computational Fluid Dynamics (CFD) approach is employed to solve the equations. Numerical results are presented through streamlines and isotherms. The Nusselt number (Nu) and entropy generation are calculated to assess heat transfer. Results show a 4.75 % decrease in heat transfer rate as the nanoparticle volume fraction (φ) varies from 0 to 0.04, and a further 6.31 % reduction as the Hartmann number (Ha) increases from 0 to 20. The Nusselt number for non-uniform heating amplitude <math><mrow><mi>I</mi></mrow></math> (from 0.5 to 0.9) displays a significant increase of up to 39 % as Hartmann number increases from 0 to 20, while showing an overall decrease of approximately 41 % across frequency (<math><mrow><mi>f</mi></mrow></math> = 0, 1 and 3) as the <math><mrow><mi>H</mi><mi>a</mi></mrow></math> increases from 0 to 100. Entropy generation decreases significantly, by approximately 67 % for <math><mrow><mi>φ</mi></mrow></math> (0–0.02), 59 % for <math><mrow><mi>I</mi></mrow></math> (0.05–1) and 57 % for <math><mrow><mi>f</mi></mrow></math> (0–3), as <math><mrow><mi>H</mi><mi>a</mi></mrow></math> increases from (0–100). Kinetic energy decreases for increasing frequency <math><mrow><mo>(</mo><mi>f</mi><mo>)</mo></mrow></math>, Rayleigh number <math><mrow><mo>(</mo><mrow><mi>R</mi><mi>a</mi></mrow><mo>)</mo></mrow></math>, and inclination angle <math><mrow><mo>(</mo><mi>γ</mi><mo>)</mo></mrow></math>.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"70 ","pages":"Article 106105"},"PeriodicalIF":6.4000,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Case Studies in Thermal Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214157X2500365X","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"THERMODYNAMICS","Score":null,"Total":0}

引用次数: 0

Abstract

This study investigates the heat transfer enhancement in a non-uniform magnetize nanofluid flow inside a pyramid shape cavity with hot circular obstacle. Non-uniform heating is applied at the bottom wall, and scaling is used to convert the governing equations into dimensionless form. The Computational Fluid Dynamics (CFD) approach is employed to solve the equations. Numerical results are presented through streamlines and isotherms. The Nusselt number (Nu) and entropy generation are calculated to assess heat transfer. Results show a 4.75 % decrease in heat transfer rate as the nanoparticle volume fraction (φ) varies from 0 to 0.04, and a further 6.31 % reduction as the Hartmann number (Ha) increases from 0 to 20. The Nusselt number for non-uniform heating amplitude

I

(from 0.5 to 0.9) displays a significant increase of up to 39 % as Hartmann number increases from 0 to 20, while showing an overall decrease of approximately 41 % across frequency (

f

= 0, 1 and 3) as the

H a

increases from 0 to 100. Entropy generation decreases significantly, by approximately 67 % for

φ

(0–0.02), 59 % for

I

(0.05–1) and 57 % for

f

(0–3), as

H a

increases from (0–100). Kinetic energy decreases for increasing frequency

(f)

, Rayleigh number

(R a)

, and inclination angle

(γ)

查看原文本刊更多论文

非均匀加热作用下锥体内磁化纳米流体的水热分析

本文研究了非均匀磁化纳米流体在具有热圆障碍物的锥形腔内流动时的传热增强。在底壁处施加非均匀加热，并采用标度法将控制方程转化为无因次形式。采用计算流体力学（CFD）方法求解。数值结果通过流线和等温线给出。计算努塞尔数（Nu）和熵产来评估传热。结果表明：当纳米颗粒体积分数（φ）在0 ~ 0.04范围内变化时，传热率降低4.75%；当哈特曼数（Ha）在0 ~ 20范围内增加时，传热率降低6.31%；当哈特曼数从0增加到20时，非均匀加热振幅I（从0.5到0.9）的努塞尔数显著增加了39%，而当Ha从0增加到100时，整个频率（f = 0,1和3）的努塞尔数总体下降了约41%。当Ha从（0-100）增加时，熵生成显著减少，φ(0-0.02)约为67%，I（0.05-1）约为59%，f（0-3）约为57%。动能随频率(f)、瑞利数（Ra）和倾角（γ）的增加而减小。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.