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ID 11206
Eprint ID
11206
FullText URL
Title Alternative
Numerical Analysis Model of Forced Convection Heat Transfer of a Layer of Spherical Particles Considering Boundary Wall Effect
Author
Ozaki, Koichi
Inaba, Hideo
Abstract
A simple model for the heat transfer and pressure drop characteristics in a layer of spherical particles is proposed in the present study. The layer of spherical particles bounded by two parallel boundary walls is considered to consist in two regions, one of which is the near-wall region of particles within a half-diameter of the spherical particle from the wall, and the other is the core region of particles over a half-diameter of the spherical particle away from the wall. The characteristics of the near-wall region, such as the permeability, the Forchheimer coefficient, and the thermal dispersion coefficient, are determined based on the experimental data for a one-stage spherical particle layer. For the core region, the permeability and the Forchheimer coefficient are evaluated using previous correlations for a homogeneous spherical particle layer, while the thermal dispersion coefficient is modified from that given by the previous correlation for a homogeneous spherical particle layer to include the effect of the thermal conductivity ratio of the spherical particle and the fluid. The effective thermal conductivity of the layer of spherical particles is assumed to be constant in the present model. The validity of the model is proved by comparing the results of this analysis with experimental results under various conditions.
Abstract Alternative
本報では、比較的大きな直径(d=9.54~21.2mm)を有する球状粒子一段充填層に関する実験結果に基づく、壁近傍領域の流動・伝熱モデルの提案を試みる。具体的には、粒子充填層としての物理的意味が損なわれないよう、粒子直径程度のスケールを用いてミクロな立場の基礎式を空間平均化する。得られた粒子充填層に関する基礎式中の有効熱伝導率、浸透性、Forchheimer係数等の諸特性値は次のように評価する。前報の結果に基づき、球状粒子充填層が、壁面より粒子直径の半分までの壁近傍領域と、壁面より粒子直径の半分以上離れたコア領域の二領域から構成されると考え、各領域における諸特性値は、微細なスケールでの変化を考慮せず、その平均値にて一定とみなした扱いを行う。また、実験条件の大きく異なる従来の実験データとの比較も行い、本解析法の有用性についても検討を行う。
Keywords
Spherical Particle Layer
Forced Convection Heat Transfer
Effective Thermal Conductivity
Numeical Analysis
Wall Effect
Note
本文データは学協会の許諾に基づきCiNiiから複製したものである
Published Date
1996-11-25
Publication Title
日本機械学會論文集 B編
Publication Title Alternative
Transactions of the Japan Society of Mechanical Engineers B
Volume
volume62
Issue
issue603
Publisher
社団法人日本機械学会
Publisher Alternative
The Japan Society of Mechanical Engineers
Start Page
172
End Page
179
ISSN
0387-5016
NCID
AN00187441
Content Type
Journal Article
Official Url
http://ci.nii.ac.jp/naid/110002395119/
language
日本語
Copyright Holders
社団法人日本機械学会
File Version
publisher
Refereed
True