Permeability and effective thermal conductivity of bisized porous media

被引：27
|
作者：
Dias, Ricardo P.
Fernandes, Carla S.
Mota, Manuel
Teixeira, Jose A.
Yelshin, Alexander
机构：
[1] Inst Politecn Braganca, Escola Super Tecnol & Gestao, Dept Tecnol Quim, P-5301857 Braganca, Portugal
[2] Inst Politecn Braganca, Escola Super Tecnol & Gestao, Dept Matemat, P-5301857 Braganca, Portugal
[3] Univ Minho, Ctr Eng Biol, P-4710057 Braga, Portugal
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2007年 / 50卷 / 7-8期
关键词：
fixed bed; binary particulate mixtures; permeability; effective thermal conductivity;
D O I：
10.1016/j.ijheatmasstransfer.2006.09.039
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In the region of minimum porosity of particulate binary mixtures, heat exchange and permeability were found to be higher than the ones obtained with a mono-size packing built with the same small size particles used in the binary packing. This effect was noticed in the range of the particles size ratio 0.1-1.0. The obtained improvement on thermal performance is related to the increase of effective thermal conductivity (ETC) in the binary packing and to the increase in transversal thermal dispersion due to the porosity decrease and tortuosity increase. Permeability can increase by a factor of two, if the size ratio between small and large spheres of a loose packing stays in the range 0.3-0.5. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1295 / 1301
页数：7
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