金属泡沫的数学随机生成和混合太阳能集热器传热的 3D 数值模拟

IF 2.5 4区 工程技术 Q2 ENGINEERING, MECHANICAL Journal of Porous Media Pub Date : 2024-06-01 DOI:10.1615/jpormedia.2024052398
syrine khadhrawi, haikel ben hamed, fakhreddine segni oueslati
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引用次数: 0

摘要

该研究的主要目的是对混合太阳能集热器的传热进行数值探索,该集热器是一个部分填充了随机生成的金属泡沫(MF)的笛卡尔通道。为了生成金属泡沫,使用了随机高斯相关技术。这种技术可以对密度、渗透性和孔隙率进行空间控制,其数值也可以从理论上获得。为了求解流体动力学和热传递方程,采用了有限体积多网格方案。由于孔隙体积在很大程度上大于多孔介质中的 VER,因此能量方程采用双温模型,动量方程采用透明流体情况下的动量方程。讨论了不同相关参数下的速度场和温度场,并给出了努赛特数、孔隙率、理查森数和雷诺数之间的数学相关性。研究发现,超过两个区块后,添加 MF 就没有用了,因为我们可以达到更高的温度均匀性和良好的传热效率。研究还发现,与平均特性模型相比,双温模型非常逼真,而且由于可以对同一 MF 模型进行数值和实验研究,因此具有广阔的前景:该模型是随机生成的,可在三维空间打印。
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MATHEMATICAL RANDOM GENERATION OF METAL FOAM AND NUMERICAL 3D SIMULATIONS OF HEAT TRANSFER IN A HYBRID SOLAR COLLECTOR
The primary motive of the study is to explore numerically the heat transfer a hybrid solar collector, which is a partially filled Cartesian channel with random generated Metal Foam (MF). The channel is subjected to solar irradiation, and through it the air flows.To generate the MF, random Gaussian correlations are used. This technique allows spatial control of density, permeability, and porosity, whose values are also theoretically accessible. To solve the equations of fluid dynamics and heat transfer, a finite volume multigrid scheme is used. Energy equation is framed on the two temperatures model, and momentum equation is that of the clear fluid case, since the pore’s volumes are largely greater than the VER in the porous media. Thevelocity as well as temperature fields are discussed for different pertinent parameters, and mathematic correlations are given between the Nusselt, the porosity, the Richardson and the Reynolds numbers. It is found that beyond two blocks, it is useless to add MF because we reach higher homogeneity in temperature and good efficiency in heat transfer. It is also found that the two temperatures model is very realisticthan models with averaged properties, and gives wide range of perspectivesthanks to the possibility of carrying out numerical and experimental investigations onthe same MF model: randomly generated and printable in 3D
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来源期刊
Journal of Porous Media
Journal of Porous Media 工程技术-工程:机械
CiteScore
3.50
自引率
8.70%
发文量
89
审稿时长
12.5 months
期刊介绍: The Journal of Porous Media publishes original full-length research articles (and technical notes) in a wide variety of areas related to porous media studies, such as mathematical modeling, numerical and experimental techniques, industrial and environmental heat and mass transfer, conduction, convection, radiation, particle transport and capillary effects, reactive flows, deformable porous media, biomedical applications, and mechanics of the porous substrate. Emphasis will be given to manuscripts that present novel findings pertinent to these areas. The journal will also consider publication of state-of-the-art reviews. Manuscripts applying known methods to previously solved problems or providing results in the absence of scientific motivation or application will not be accepted. Submitted articles should contribute to the understanding of specific scientific problems or to solution techniques that are useful in applications. Papers that link theory with computational practice to provide insight into the processes are welcome.
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