Magneto-thermal convection in a porous circular cavity with Cassini oval obstacles: A numerical study on heat transfer enhancement

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer Pub Date : 2025-09-30 DOI:10.1016/j.icheatmasstransfer.2025.109742

Bahram Jalili , Hassan Roshani , Payam Jalili , Dong Liu , Davood Domiri Ganji

{"title":"Magneto-thermal convection in a porous circular cavity with Cassini oval obstacles: A numerical study on heat transfer enhancement","authors":"Bahram Jalili , Hassan Roshani , Payam Jalili , Dong Liu , Davood Domiri Ganji","doi":"10.1016/j.icheatmasstransfer.2025.109742","DOIUrl":null,"url":null,"abstract":"<div><div>The stream function, temperature distribution, and natural convective heat transfer in a porous circular cavity with various obstacle geometries. The geometries considered include Horizontal Cassini Ovals (HCO), Vertical Cassini Ovals (VCO), and vertical Cassini ovals with two cylindrical obstacles. The system is subjected to a magnetic field at γ = 45°and a radiation parameter of Rd = 0.7. Water mixed with 5 % alumina nanoparticles (Al<sub>2</sub>O<sub>3</sub> <!-->) is used as the base fluid. The boundary conditions are consistent across all configurations, with the cavity surface maintained at a high temperature and the obstacles subjected to uniform heat flux (Dirichlet condition), while all surfaces adhere to a no-slip condition under a uniform magnetic field at 45 degrees. Results indicate that the circular cavity with a VCO obstacle shows the most significant reduction in stream function, decreasing by 48.9 % compared to the HCO, followed by configurations with two cylindrical barriers. The temperature increase is highest in the vertical Cassini oval geometry, rising by 498.6 % over the horizontal Cassini case. Additionally, this configuration achieves the maximum local Nusselt number in the cavity with a VCO and two cylindrical obstacles, highlighting superior heat transfer performance.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109742"},"PeriodicalIF":6.4000,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Communications in Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0735193325011686","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}

引用次数: 0

Abstract

The stream function, temperature distribution, and natural convective heat transfer in a porous circular cavity with various obstacle geometries. The geometries considered include Horizontal Cassini Ovals (HCO), Vertical Cassini Ovals (VCO), and vertical Cassini ovals with two cylindrical obstacles. The system is subjected to a magnetic field at γ = 45°and a radiation parameter of Rd = 0.7. Water mixed with 5 % alumina nanoparticles (Al₂O₃ ) is used as the base fluid. The boundary conditions are consistent across all configurations, with the cavity surface maintained at a high temperature and the obstacles subjected to uniform heat flux (Dirichlet condition), while all surfaces adhere to a no-slip condition under a uniform magnetic field at 45 degrees. Results indicate that the circular cavity with a VCO obstacle shows the most significant reduction in stream function, decreasing by 48.9 % compared to the HCO, followed by configurations with two cylindrical barriers. The temperature increase is highest in the vertical Cassini oval geometry, rising by 498.6 % over the horizontal Cassini case. Additionally, this configuration achieves the maximum local Nusselt number in the cavity with a VCO and two cylindrical obstacles, highlighting superior heat transfer performance.

查看原文本刊更多论文

具有卡西尼椭圆障碍物的多孔圆腔内磁热对流：传热增强的数值研究

具有不同障碍物几何形状的多孔圆腔内的流函数、温度分布和自然对流换热。考虑的几何形状包括水平卡西尼椭圆形（HCO），垂直卡西尼椭圆形（VCO）和垂直卡西尼椭圆形与两个圆柱形障碍物。系统受到γ = 45°的磁场作用，辐射参数Rd = 0.7。混合了5%氧化铝纳米粒子（Al2O3）的水作为基液。所有构型的边界条件都是一致的，腔体表面保持高温，障碍物处于均匀热流（Dirichlet条件），而在45度均匀磁场下，所有表面都保持无滑移状态。结果表明，有VCO障碍物的圆形腔体的流函数减小幅度最大，比有HCO障碍物的腔体减小48.9%，其次是有两个圆柱形障碍物的腔体。在垂直的卡西尼椭圆几何结构中，温度上升幅度最大，比水平的卡西尼情况上升了498.6%。此外，这种配置在腔体中实现了最大的局部努塞尔数，具有VCO和两个圆柱形障碍物，突出了优越的传热性能。

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

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.