Application of Porous Media Methods for Engineered Materials最新文献

Transient Temperature Computation of Spheres in Packings With Multi-Neighbors 多邻域填料中球的瞬态温度计算

Application of Porous Media Methods for Engineered Materials Pub Date : 1999-11-14 DOI: 10.1115/imece1999-0799

W. Siu, S. H. Lee

{"title":"Transient Temperature Computation of Spheres in Packings With Multi-Neighbors","authors":"W. Siu, S. H. Lee","doi":"10.1115/imece1999-0799","DOIUrl":"https://doi.org/10.1115/imece1999-0799","url":null,"abstract":"\u0000 Packed sphere systems commonly involve heat transfer processes, such as catalytic beds and insulations. Most of the time, these types of systems were considered as porous media. In fact, porous medium approach has been successfully used for application involving considerable amount of spheres with corresponding resolution and, typically in geothermal system study. In recently years, researchers have started to investigate the problem in a finer length scale formulation because of the relevant application requirement, such as powder sintering processes. Using thermal constriction resistance for solving transient temperature of individual sphere in a packing was one of the attempt to achieve the finer resolution of temperature. It has been found that a special formulation is required in order to take care the finite heat diffusion mechanism between spheres. However, available correlations and governing equations from literature were only applicable for spheres with two neighbors. It is obviously not sufficient for solving temperatures of spheres within realistic packing. Furthermore, the interaction of the finite diffusion amoung spheres should be more complicated in three dimensional packing situation. Therefore, this work focuses on the enhancement of the approach of using constriction resistance for realistic packing of spheres. The formulation of the governing equation with the consideration of multi-neighbor arrangement was performed. A finite difference code was developed and using for solving the governing equation. It has been verified to be applicable to multi-neighbor situation few regular packing situations. Computation of sphere temperatures of a packing involving a thousand of spheres was also performed for illustrating the application.","PeriodicalId":378994,"journal":{"name":"Application of Porous Media Methods for Engineered Materials","volume":"265 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122141501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solar Radiation Thruster Performance Analysis With Energy Storage in Porous Material 多孔材料储能的太阳辐射推力器性能分析

Application of Porous Media Methods for Engineered Materials Pub Date : 1999-11-14 DOI: 10.1115/imece1999-0798

Y. Chen, Jiwen Liu, H. Wei

引用次数: 0

An Analytical-Experimental Study for the Determination of the Effective Thermal Conductivity of High Porosity Fibrous Foams 高孔隙率纤维泡沫有效导热系数测定的分析-实验研究

Application of Porous Media Methods for Engineered Materials Pub Date : 1999-11-14 DOI: 10.1115/imece1999-0795

A. Bhattacharya, V. Calmidi, R. Mahajan

{"title":"An Analytical-Experimental Study for the Determination of the Effective Thermal Conductivity of High Porosity Fibrous Foams","authors":"A. Bhattacharya, V. Calmidi, R. Mahajan","doi":"10.1115/imece1999-0795","DOIUrl":"https://doi.org/10.1115/imece1999-0795","url":null,"abstract":"\u0000 In this paper, we present a comprehensive analysis for estimating the effective thermal conductivity of high porosity fibrous foams. Commercially available fibrous foams form a complex array of interconnected fibers with an irregular lump of metal at the intersection of two fibers. In our theoretical analysis, we represent this structure by a model consisting of two-dimensional hexagonal arrays where the fibers form the sides of the hexagons. The lump is taken into account by considering a square, hexagonal or circular blob of metal at the intersection. The analysis shows that the effective thermal conductivity of the foam depends strongly on the porosity and the ratio of the cross-sections of the fiber and the intersection. It has no systematic dependence on pore density. Further, the choice of the geometric configuration of the intersection affects the estimate of the effective thermal conductivity. Experimental data with aluminum and Reticulated Vitreous Carbon (RVC) foams, using air and water as fluid media are used to validate the analytical predictions. Finally, the experimental results are used to arrive at a simple, closed-form empirical correlation for estimating the effective thermal conductivity in terms of the porosity, and the solid and fluid conductivities.","PeriodicalId":378994,"journal":{"name":"Application of Porous Media Methods for Engineered Materials","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132837600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Parametric Study of Reactive Melt Infiltration 反应熔体渗透的参数化研究

Application of Porous Media Methods for Engineered Materials Pub Date : 1999-11-14 DOI: 10.1115/imece1999-0794

E. Nelson, P. Colella

引用次数: 15

Transport Phenomena in Heterogeneous Media: Experimental Data Reduction and Analysis 异质介质中的输运现象:实验数据简化与分析

Application of Porous Media Methods for Engineered Materials Pub Date : 1999-11-14 DOI: 10.1115/imece1999-0796

V. Travkin, I. Catton, K. Hu, A. T. Ponomarenko, V. G. Shevchenko

引用次数: 5

Porous Media and Mixture Models for Hygrothermal Behavior of Phenolic Composites 酚醛复合材料湿热行为的多孔介质和混合模型

Application of Porous Media Methods for Engineered Materials Pub Date : 1999-10-01 DOI: 10.1115/imece1999-0797

R. M. Sullivan, E. Stokes

引用次数: 2