A POROUS MEDIA APPROACH FOR NUMERICAL OPTIMISATION OF THERMAL WHEEL

Ahmed Alhusseny, Nabeel Al-Zurfi, Qahtan Al-Aabidy, Adel Nasser, Hayder Al-Sarraf
{"title":"A POROUS MEDIA APPROACH FOR NUMERICAL OPTIMISATION OF THERMAL WHEEL","authors":"Ahmed Alhusseny, Nabeel Al-Zurfi, Qahtan Al-Aabidy, Adel Nasser, Hayder Al-Sarraf","doi":"10.30572/2018/kje/140405","DOIUrl":null,"url":null,"abstract":"The experimental investigations of rotating heat exchangers are usually too costly and provide limited understanding for the phenomena of heat and fluid flow within them; hence, a less expensive and more comprehensive method is required to investigate what can affect their overall performance. In the current study, a porous media concept is presented as an alternative way to numerically analyse the fluid flow and heat transport through a rotary thermal regenerator. An aluminum core formed of multi-packed square passages is simulated as a porous medium of an orthotropic porosity in order to allow the counter-flowing streams to flow in a way similar to that inside the regenerator core. The geometric properties of the core were transformed into the conventional porous media parameters such as the permeability and inertial coefficient based on empirical equations; so, the core has been dealt with as a porous medium of known features. Fluid and solid phases are assumed to be in a local thermal non-equilibrium state with each other. A commercial CFD code \"STAR CCM+\" was used to solve the current problem numerically, where heat is allowed to be exchanged between the two phases and tracked by creating a heat exchanger interface in the core region. The results are presented by means of overall thermal effectiveness, pressure drop, and coefficient of performance COP. Using porous media approach has been found to be sufficient to simulate the current problem, where the currently computed data were found to deviate by up to 2.7% only from the corresponding analytical and experimental data. The data obtained reveal an obvious impact of the core geometrical parameters on both the heat restored and pressure loss; and hence, the overall efficiency of the regenerator system.","PeriodicalId":32466,"journal":{"name":"Magallat Alkufat Alhandasiyyat","volume":"37 S2","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Magallat Alkufat Alhandasiyyat","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.30572/2018/kje/140405","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

The experimental investigations of rotating heat exchangers are usually too costly and provide limited understanding for the phenomena of heat and fluid flow within them; hence, a less expensive and more comprehensive method is required to investigate what can affect their overall performance. In the current study, a porous media concept is presented as an alternative way to numerically analyse the fluid flow and heat transport through a rotary thermal regenerator. An aluminum core formed of multi-packed square passages is simulated as a porous medium of an orthotropic porosity in order to allow the counter-flowing streams to flow in a way similar to that inside the regenerator core. The geometric properties of the core were transformed into the conventional porous media parameters such as the permeability and inertial coefficient based on empirical equations; so, the core has been dealt with as a porous medium of known features. Fluid and solid phases are assumed to be in a local thermal non-equilibrium state with each other. A commercial CFD code "STAR CCM+" was used to solve the current problem numerically, where heat is allowed to be exchanged between the two phases and tracked by creating a heat exchanger interface in the core region. The results are presented by means of overall thermal effectiveness, pressure drop, and coefficient of performance COP. Using porous media approach has been found to be sufficient to simulate the current problem, where the currently computed data were found to deviate by up to 2.7% only from the corresponding analytical and experimental data. The data obtained reveal an obvious impact of the core geometrical parameters on both the heat restored and pressure loss; and hence, the overall efficiency of the regenerator system.
热轮数值优化的多孔介质方法
旋转换热器的实验研究通常过于昂贵,对换热器内的热和流体流动现象的理解有限;因此,需要一种更便宜、更全面的方法来研究影响它们整体性能的因素。在目前的研究中,多孔介质概念被提出作为一种替代方法来数值分析流体流动和热传递通过旋转蓄热器。由多填料方形通道组成的铝芯被模拟为具有正交各向异性孔隙度的多孔介质,以允许逆流流以类似于再生器芯内部的方式流动。根据经验方程将岩心的几何性质转化为渗透率、惯性系数等常规多孔介质参数;因此,岩心被视为具有已知特征的多孔介质。假定流体和固相彼此处于局部热非平衡状态。商业CFD代码“STAR CCM+”用于数值解决当前的问题,其中允许热量在两相之间交换,并通过在核心区域创建热交换器界面来跟踪。通过综合热效率、压降和性能COP系数给出了计算结果。使用多孔介质方法已被发现足以模拟当前的问题,其中目前计算的数据与相应的分析和实验数据相差高达2.7%。结果表明,堆芯几何参数对热恢复和压力损失有明显的影响;因此,蓄热系统的整体效率。
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
CiteScore
0.10
自引率
0.00%
发文量
19
审稿时长
12 weeks
×
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