{"title":"水基纳米流体的混合对流及部分多孔环形空间中的熔融传热","authors":"","doi":"10.1016/j.tsep.2024.102881","DOIUrl":null,"url":null,"abstract":"<div><p>In this article, we aim to study the effects of applied heat flux, magnetoconvection and nanoparticle concentration on the magnetite-water (<span><math><mrow><msub><mrow><mi>Fe</mi></mrow><mrow><mn>3</mn></mrow></msub><msub><mrow><mi>O</mi></mrow><mrow><mn>4</mn></mrow></msub><mo>−</mo><msub><mrow><mi>H</mi></mrow><mrow><mn>2</mn></mrow></msub><mi>O</mi></mrow></math></span>) ferrofluid flow and melting heat transfer through a partially-porous annulus. This annular region is bounded by a heated inner cylinder and melting outer cylindrical ice wall. The flow is influenced by an alternating magnetic field generated by a current carrying wire within the inner cylinder, and the Brinkman–Forchheimer model is used to describe the ferrofluid flow through the porous region. Using the finite element method (FEM) on the coupled non-linear system of governing equations, we generate graphical results via MATLAB. The numerical algorithm developed for solving this problem is validated against published work in the literature with a maximum relative error of 5%. Results show that reductions in magnetoconvection, initial thickness of ice, nanoparticle volume fraction, or an increase in heat generated by inner cylinder increases the rate of melting of ice, with computed percentage increases of 12.7%, 72.1%, 4.7%, and 22.1% respectively. The axial velocity of the ferrofluid is decreased with an increase in magnetoconvection or increased rate of melting; however, this increases the amplitude of the radial velocity component. The cooling performance of the ferrofluid increases with increased magnetoconvection (5.2%), nanoparticle volume fraction (5.9%), and initial thickness of ice (52.1%). Based on these results the ferrofluid is more efficient at cooling the heated cylindrical wall than melting the ice.</p></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":null,"pages":null},"PeriodicalIF":5.1000,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Mixed convective flow of water-based nanofluid and melting heat transfer in a partially porous annulus\",\"authors\":\"\",\"doi\":\"10.1016/j.tsep.2024.102881\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this article, we aim to study the effects of applied heat flux, magnetoconvection and nanoparticle concentration on the magnetite-water (<span><math><mrow><msub><mrow><mi>Fe</mi></mrow><mrow><mn>3</mn></mrow></msub><msub><mrow><mi>O</mi></mrow><mrow><mn>4</mn></mrow></msub><mo>−</mo><msub><mrow><mi>H</mi></mrow><mrow><mn>2</mn></mrow></msub><mi>O</mi></mrow></math></span>) ferrofluid flow and melting heat transfer through a partially-porous annulus. This annular region is bounded by a heated inner cylinder and melting outer cylindrical ice wall. The flow is influenced by an alternating magnetic field generated by a current carrying wire within the inner cylinder, and the Brinkman–Forchheimer model is used to describe the ferrofluid flow through the porous region. Using the finite element method (FEM) on the coupled non-linear system of governing equations, we generate graphical results via MATLAB. The numerical algorithm developed for solving this problem is validated against published work in the literature with a maximum relative error of 5%. Results show that reductions in magnetoconvection, initial thickness of ice, nanoparticle volume fraction, or an increase in heat generated by inner cylinder increases the rate of melting of ice, with computed percentage increases of 12.7%, 72.1%, 4.7%, and 22.1% respectively. The axial velocity of the ferrofluid is decreased with an increase in magnetoconvection or increased rate of melting; however, this increases the amplitude of the radial velocity component. The cooling performance of the ferrofluid increases with increased magnetoconvection (5.2%), nanoparticle volume fraction (5.9%), and initial thickness of ice (52.1%). Based on these results the ferrofluid is more efficient at cooling the heated cylindrical wall than melting the ice.</p></div>\",\"PeriodicalId\":23062,\"journal\":{\"name\":\"Thermal Science and Engineering Progress\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.1000,\"publicationDate\":\"2024-09-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Thermal Science and Engineering Progress\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2451904924004992\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thermal Science and Engineering Progress","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2451904924004992","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
Mixed convective flow of water-based nanofluid and melting heat transfer in a partially porous annulus
In this article, we aim to study the effects of applied heat flux, magnetoconvection and nanoparticle concentration on the magnetite-water () ferrofluid flow and melting heat transfer through a partially-porous annulus. This annular region is bounded by a heated inner cylinder and melting outer cylindrical ice wall. The flow is influenced by an alternating magnetic field generated by a current carrying wire within the inner cylinder, and the Brinkman–Forchheimer model is used to describe the ferrofluid flow through the porous region. Using the finite element method (FEM) on the coupled non-linear system of governing equations, we generate graphical results via MATLAB. The numerical algorithm developed for solving this problem is validated against published work in the literature with a maximum relative error of 5%. Results show that reductions in magnetoconvection, initial thickness of ice, nanoparticle volume fraction, or an increase in heat generated by inner cylinder increases the rate of melting of ice, with computed percentage increases of 12.7%, 72.1%, 4.7%, and 22.1% respectively. The axial velocity of the ferrofluid is decreased with an increase in magnetoconvection or increased rate of melting; however, this increases the amplitude of the radial velocity component. The cooling performance of the ferrofluid increases with increased magnetoconvection (5.2%), nanoparticle volume fraction (5.9%), and initial thickness of ice (52.1%). Based on these results the ferrofluid is more efficient at cooling the heated cylindrical wall than melting the ice.
期刊介绍:
Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.