Ahmed M. Hassan , Mohammed Azeez Alomari , Abdellatif M. Sadeq , Faris Alqurashi , Mujtaba A. Flayyih
{"title":"π形腔内nepcm -水混合物双扩散混合对流及熵产分析","authors":"Ahmed M. Hassan , Mohammed Azeez Alomari , Abdellatif M. Sadeq , Faris Alqurashi , Mujtaba A. Flayyih","doi":"10.1016/j.icheatmasstransfer.2025.109395","DOIUrl":null,"url":null,"abstract":"<div><div>Thermal systems utilizing nano-encapsulated phase change materials (NEPCMs) in complex geometries offer promising solutions for efficient energy storage and management under electromagnetic control. This study aims to investigate double-diffusive mixed convection and entropy generation in a π-shaped cavity with wavy lid containing NEPCM-water mixture subjected to a transverse magnetic field. The mathematical model employs the Boussinesq approximation for density variations while disregarding viscous dissipation and chemical interactions. Governing equations are solved using finite element analysis with Galerkin's method across wide parametric ranges of Reynolds (25–100), Richardson (0.1–10), Lewis (1–5), Stefan (0.1–0.9) numbers, fusion temperature (0.1–0.9), NEPCM concentration (0.01–0.04), and Hartmann number (0–80). Results demonstrate that Reynolds and Richardson numbers significantly enhance heat and mass transfer (up to 204 % increase in Nusselt number), while magnetic fields substantially suppress convective transport (60.5 % reduction in Nusselt number). NEPCM concentration improves thermal performance by 39.3 % with minimal effect on mass transfer. Entropy generation analysis reveals that thermal irreversibilities dominate, with both magnetic field strength and NEPCM concentration reducing system irreversibilities. These findings provide critical insights for optimizing thermal energy storage systems with electromagnetic regulation in applications ranging from solar collectors to electronic cooling solutions.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109395"},"PeriodicalIF":6.4000,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Double diffusive mixed convection and entropy generation analysis of NEPCM-water mixture in a π-shaped cavity\",\"authors\":\"Ahmed M. Hassan , Mohammed Azeez Alomari , Abdellatif M. Sadeq , Faris Alqurashi , Mujtaba A. Flayyih\",\"doi\":\"10.1016/j.icheatmasstransfer.2025.109395\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Thermal systems utilizing nano-encapsulated phase change materials (NEPCMs) in complex geometries offer promising solutions for efficient energy storage and management under electromagnetic control. This study aims to investigate double-diffusive mixed convection and entropy generation in a π-shaped cavity with wavy lid containing NEPCM-water mixture subjected to a transverse magnetic field. The mathematical model employs the Boussinesq approximation for density variations while disregarding viscous dissipation and chemical interactions. Governing equations are solved using finite element analysis with Galerkin's method across wide parametric ranges of Reynolds (25–100), Richardson (0.1–10), Lewis (1–5), Stefan (0.1–0.9) numbers, fusion temperature (0.1–0.9), NEPCM concentration (0.01–0.04), and Hartmann number (0–80). Results demonstrate that Reynolds and Richardson numbers significantly enhance heat and mass transfer (up to 204 % increase in Nusselt number), while magnetic fields substantially suppress convective transport (60.5 % reduction in Nusselt number). NEPCM concentration improves thermal performance by 39.3 % with minimal effect on mass transfer. Entropy generation analysis reveals that thermal irreversibilities dominate, with both magnetic field strength and NEPCM concentration reducing system irreversibilities. These findings provide critical insights for optimizing thermal energy storage systems with electromagnetic regulation in applications ranging from solar collectors to electronic cooling solutions.</div></div>\",\"PeriodicalId\":332,\"journal\":{\"name\":\"International Communications in Heat and Mass Transfer\",\"volume\":\"167 \",\"pages\":\"Article 109395\"},\"PeriodicalIF\":6.4000,\"publicationDate\":\"2025-07-22\",\"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/S0735193325008218\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MECHANICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Communications in Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0735193325008218","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}
Double diffusive mixed convection and entropy generation analysis of NEPCM-water mixture in a π-shaped cavity
Thermal systems utilizing nano-encapsulated phase change materials (NEPCMs) in complex geometries offer promising solutions for efficient energy storage and management under electromagnetic control. This study aims to investigate double-diffusive mixed convection and entropy generation in a π-shaped cavity with wavy lid containing NEPCM-water mixture subjected to a transverse magnetic field. The mathematical model employs the Boussinesq approximation for density variations while disregarding viscous dissipation and chemical interactions. Governing equations are solved using finite element analysis with Galerkin's method across wide parametric ranges of Reynolds (25–100), Richardson (0.1–10), Lewis (1–5), Stefan (0.1–0.9) numbers, fusion temperature (0.1–0.9), NEPCM concentration (0.01–0.04), and Hartmann number (0–80). Results demonstrate that Reynolds and Richardson numbers significantly enhance heat and mass transfer (up to 204 % increase in Nusselt number), while magnetic fields substantially suppress convective transport (60.5 % reduction in Nusselt number). NEPCM concentration improves thermal performance by 39.3 % with minimal effect on mass transfer. Entropy generation analysis reveals that thermal irreversibilities dominate, with both magnetic field strength and NEPCM concentration reducing system irreversibilities. These findings provide critical insights for optimizing thermal energy storage systems with electromagnetic regulation in applications ranging from solar collectors to electronic cooling solutions.
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.