利用非均匀磁场增强二维微通道突然压缩前的热传递

IF 1.5 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Hamid-Reza Bahrami, Mahziyar Ghaedi
{"title":"利用非均匀磁场增强二维微通道突然压缩前的热传递","authors":"Hamid-Reza Bahrami, Mahziyar Ghaedi","doi":"10.1615/jenhheattransf.2023050891","DOIUrl":null,"url":null,"abstract":"With the integration of electronic devices advancing, effectively dissipating heat generated has become a challenging task. One promising solution is utilizing heat convection as a powerful tool. However, a notable issue arises when encountering an obstacle, such as a resistor requiring cooling. In these cases, the flow slows down, weakening heat transfer. In order to model this obstacle, it can be perceived as a sudden compression. The critical area of interest lies where the horizontal wall approaches the vertical side of the obstacle. This study examines the use of non-uniform magnetic fields to explore various arrangements aimed at enhancing thermal energy transfer in this critical region. These arrangements include placing a single dipole beneath either the lower or upper walls and utilizing two or three single dipoles simultaneously beneath the heated wall. The ferrofluid used in this study is EMG-308. The findings of this study demonstrate that heat transfer improves when single or multiple dipoles are positioned downstream of the step wall on the heated wall. For instance, by having three dipoles of equal strength in that area, the minimum Nusselt number is enhanced by 300%, resulting in a Nusselt number before the step that surpasses the Nusselt number immediately after the step.","PeriodicalId":50208,"journal":{"name":"Journal of Enhanced Heat Transfer","volume":null,"pages":null},"PeriodicalIF":1.5000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Using a non-uniform magnetic field to enhance heat transfer before a sudden compression in a 2D milli-channel\",\"authors\":\"Hamid-Reza Bahrami, Mahziyar Ghaedi\",\"doi\":\"10.1615/jenhheattransf.2023050891\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"With the integration of electronic devices advancing, effectively dissipating heat generated has become a challenging task. One promising solution is utilizing heat convection as a powerful tool. However, a notable issue arises when encountering an obstacle, such as a resistor requiring cooling. In these cases, the flow slows down, weakening heat transfer. In order to model this obstacle, it can be perceived as a sudden compression. The critical area of interest lies where the horizontal wall approaches the vertical side of the obstacle. This study examines the use of non-uniform magnetic fields to explore various arrangements aimed at enhancing thermal energy transfer in this critical region. These arrangements include placing a single dipole beneath either the lower or upper walls and utilizing two or three single dipoles simultaneously beneath the heated wall. The ferrofluid used in this study is EMG-308. The findings of this study demonstrate that heat transfer improves when single or multiple dipoles are positioned downstream of the step wall on the heated wall. For instance, by having three dipoles of equal strength in that area, the minimum Nusselt number is enhanced by 300%, resulting in a Nusselt number before the step that surpasses the Nusselt number immediately after the step.\",\"PeriodicalId\":50208,\"journal\":{\"name\":\"Journal of Enhanced Heat Transfer\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.5000,\"publicationDate\":\"2023-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Enhanced Heat Transfer\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1615/jenhheattransf.2023050891\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Enhanced Heat Transfer","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1615/jenhheattransf.2023050891","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0

摘要

随着电子设备集成度的不断提高,有效散热已成为一项具有挑战性的任务。一个很有前景的解决方案是利用热对流这一有力工具。然而,当遇到需要冷却的电阻器等障碍物时,就会出现一个明显的问题。在这种情况下,流动速度会减慢,从而削弱热传递。为了模拟这种障碍,可以将其视为突然压缩。关键的关注点在于水平壁接近障碍物垂直面的地方。本研究利用非均匀磁场来探索各种排列方式,以增强这一临界区域的热能传递。这些安排包括在下壁或上壁下方放置单个偶极子,以及在加热壁下方同时使用两个或三个单个偶极子。本研究使用的铁流体是 EMG-308。研究结果表明,在加热壁的阶梯壁下游设置单个或多个偶极子时,传热效果会得到改善。例如,通过在该区域设置三个强度相同的偶极子,最小努塞尔特数提高了 300%,从而使阶梯前的努塞尔特数超过了阶梯后的努塞尔特数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Using a non-uniform magnetic field to enhance heat transfer before a sudden compression in a 2D milli-channel
With the integration of electronic devices advancing, effectively dissipating heat generated has become a challenging task. One promising solution is utilizing heat convection as a powerful tool. However, a notable issue arises when encountering an obstacle, such as a resistor requiring cooling. In these cases, the flow slows down, weakening heat transfer. In order to model this obstacle, it can be perceived as a sudden compression. The critical area of interest lies where the horizontal wall approaches the vertical side of the obstacle. This study examines the use of non-uniform magnetic fields to explore various arrangements aimed at enhancing thermal energy transfer in this critical region. These arrangements include placing a single dipole beneath either the lower or upper walls and utilizing two or three single dipoles simultaneously beneath the heated wall. The ferrofluid used in this study is EMG-308. The findings of this study demonstrate that heat transfer improves when single or multiple dipoles are positioned downstream of the step wall on the heated wall. For instance, by having three dipoles of equal strength in that area, the minimum Nusselt number is enhanced by 300%, resulting in a Nusselt number before the step that surpasses the Nusselt number immediately after the step.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Journal of Enhanced Heat Transfer
Journal of Enhanced Heat Transfer 工程技术-工程:机械
CiteScore
3.60
自引率
8.70%
发文量
51
审稿时长
12 months
期刊介绍: The Journal of Enhanced Heat Transfer will consider a wide range of scholarly papers related to the subject of "enhanced heat and mass transfer" in natural and forced convection of liquids and gases, boiling, condensation, radiative heat transfer. Areas of interest include: ■Specially configured surface geometries, electric or magnetic fields, and fluid additives - all aimed at enhancing heat transfer rates. Papers may include theoretical modeling, experimental techniques, experimental data, and/or application of enhanced heat transfer technology. ■The general topic of "high performance" heat transfer concepts or systems is also encouraged.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信