Quantitative flow visualization of fluidized-bed heat exchanger by neutron radiography

被引：6
|
作者：
Ozawa, M
Umekawa, H
Furui, S
Hayashi, K
Takenaka, N
机构：
[1] Kansai Univ, Dept Mech Engn, Suita, Osaka 5648680, Japan
[2] Kobe Univ, Dept Mech Engn, Kobe, Hyogo 6578501, Japan
来源：
APPLIED RADIATION AND ISOTOPES | 2004年 / 61卷 / 04期
关键词：
quantitative flow visualization; neutron radiography; fluidized bed; gas-solid system; void fraction; bubble behavior;
D O I：
10.1016/j.apradiso.2004.03.099
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Quantitative flow visualization of a gas-solid fluidized-bed installed vertical tube-bank has been successfully conducted using neutron radiography and image processing technique. The quantitative data of void fraction distribution as well as the fluctuation data are presented. The time-averaged void fraction is well correlated by the drift-flux model. The bubbles formed in the bed, rise along the vertical tubes and the observed bubble size is smaller than that in a free bubbling bed without tube-banks. The bubble diameter is well correlated by the modified Mori and Wen's correlation taking into account the pitch of tube arrangement. The bubble rise velocity is also well correlated by applying the drift-flux model. These results are consistent for both bed materials of Geldart's B- and A-particles, while the bubble size is significantly different between two kinds of particles. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：715 / 724
页数：10
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