Numerical investigation of trihybrid nanofluid heat transfer in a cavity with a hot baffle

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-01-01 DOI:10.1016/j.csite.2024.105584

Rajab Alsayegh

{"title":"Numerical investigation of trihybrid nanofluid heat transfer in a cavity with a hot baffle","authors":"Rajab Alsayegh","doi":"10.1016/j.csite.2024.105584","DOIUrl":null,"url":null,"abstract":"<div><div>Trihybrid nanofluids, which combine the benefits of three distinct types of nanoparticles, have significant potential to enhance heat transfer in various thermal management applications. Understanding their behaviour in confined geometries with complex boundary conditions, such as a free surface and heated obstacle, is important to optimize their performance. This study investigates the heat transfer characteristics of a Cu-Al<sub>2</sub>O<sub>3</sub>-MWCNT-oil trihybrid nanofluid within a square cavity featuring a hot baffle and a free surface. Using numerical simulations and Patankar's blocked-off region method, a parametric study was conducted, varying the Rayleigh number (5000–50,000), nanoparticle volume fraction <span><math><mrow><mi>Φ</mi></mrow></math></span> (0–0.06), obstacle size and aspect ratio (h:w from 0.7 to 9), and Marangoni number (−10,000 to 10,000). The results reveal that negative Marangoni (Ma) numbers enhance convective heat transfer due to the synergistic interaction between the thermocapillary and buoyancy forces. Conversely, positive Marangoni numbers hinder heat transfer owing to competition between these forces. With increasing Rayleigh number (Ra), heat transfer enhancements of up to 45 %, 18 % with nanoparticle addition, and 22 % with varying obstacle sizes were observed. Therefore, these parameters can be varied to optimize the thermal design.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"65 ","pages":"Article 105584"},"PeriodicalIF":6.4000,"publicationDate":"2025-01-01","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/S2214157X24016150","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

Trihybrid nanofluids, which combine the benefits of three distinct types of nanoparticles, have significant potential to enhance heat transfer in various thermal management applications. Understanding their behaviour in confined geometries with complex boundary conditions, such as a free surface and heated obstacle, is important to optimize their performance. This study investigates the heat transfer characteristics of a Cu-Al₂O₃-MWCNT-oil trihybrid nanofluid within a square cavity featuring a hot baffle and a free surface. Using numerical simulations and Patankar's blocked-off region method, a parametric study was conducted, varying the Rayleigh number (5000–50,000), nanoparticle volume fraction

Φ

(0–0.06), obstacle size and aspect ratio (h:w from 0.7 to 9), and Marangoni number (−10,000 to 10,000). The results reveal that negative Marangoni (Ma) numbers enhance convective heat transfer due to the synergistic interaction between the thermocapillary and buoyancy forces. Conversely, positive Marangoni numbers hinder heat transfer owing to competition between these forces. With increasing Rayleigh number (Ra), heat transfer enhancements of up to 45 %, 18 % with nanoparticle addition, and 22 % with varying obstacle sizes were observed. Therefore, these parameters can be varied to optimize the thermal design.

查看原文本刊更多论文

带热挡板腔内纳米流体传热的数值研究

三杂交纳米流体结合了三种不同类型纳米颗粒的优点，在各种热管理应用中具有增强传热的巨大潜力。了解它们在具有复杂边界条件的受限几何中的行为，例如自由表面和加热障碍物，对于优化它们的性能非常重要。本研究研究了cu - al2o3 - mwcnt -油三杂化纳米流体在具有热挡板和自由表面的方形腔内的传热特性。利用数值模拟和Patankar的阻塞区域方法，对Rayleigh数（5000 ~ 50000）、纳米颗粒体积分数Φ（0 ~ 0.06）、障碍物尺寸和纵横比（h:w从0.7 ~ 9）以及Marangoni数（−10000 ~ 10000）进行了参数化研究。结果表明，负Marangoni （Ma）数增强了对流换热，这是由于热毛细力和浮力之间的协同作用。相反，由于这些力之间的竞争，正的马兰戈尼数阻碍了热传递。随着瑞利数（Ra）的增加，传热增强高达45%，纳米颗粒增加18%，不同障碍物尺寸增加22%。因此，可以改变这些参数来优化热设计。

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.