A Criterion for Transition from Bubbling to Turbulent Fluidization

Cai Ping; Jing Yong; Yu Zhiqing and Wang Zhanweng(Department of Chemistry & Chemical Engineering; Tsinghua University)

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A Criterion for Transition from Bubbling to Turbulent Fluidization

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- A Criterion for Transition from Bubbling to Turbulent Fluidization
- CIESC Journal Issue 4, (1986)
- 作者机构：
  
  清华大学化学化工系,清华大学化学化工系,清华大学化学化工系,清华大学化学化工系
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 December 1986，
  
  Published：25 December 1986
- 稿件说明：
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Cai Ping, Jing Yong, Yu Zhiqing and Wang Zhanweng(Department of Chemistry & Chemical Engineering, et al. A Criterion for Transition from Bubbling to Turbulent Fluidization[J]. CIESC Journal, 1986, (4).
DOI：

Cai Ping, Jing Yong, Yu Zhiqing and Wang Zhanweng(Department of Chemistry & Chemical Engineering, et al. A Criterion for Transition from Bubbling to Turbulent Fluidization[J]. CIESC Journal, 1986, (4). DOI：

摘要

通过对流化床床层压力脉动信号的计算机在线分析

对气-固密相流化床中鼓泡流态化向湍动流态化的转变过程进行了研究.在较大范围内考察了颗粒重度、颗粒尺寸和床层结构条件对这一流型转变的影响.给出了鼓泡流化向湍动流化转变速度U_c的计算式:U_c/(gd_ρ)~(1/2)=[k(D_f/d_ρ)·((ρ_ρ-ρ_f)/ρ_f)]~n并察明Geldart的颗粒分类方法亦可反映床层流型转变的特征

从而赋予了Geldart颗粒分类方法以新的内涵.

Abstract

Investigations of the transition from bubbling to turbulent fluidizationwere conducted in a gas-solid fluidized bed using on-line computer analysis of pressure fluctuations. In order to study the effects of density and size of the particles as well as bed geometry on the transition

a series of experiments were performed

resulting in the following conclusions. 1. The technique of pressure fluctuation analysis was found effective and reliable in fluidization studies. 2. A correlation was obtained for the effect of powder properties and fluidized bed geometry on the transition velocity

Uc from bubbling to turbulent fluidization: 3. Addition of a new Yc-axis to Geldarts classification diagram is suggested

ia order to predict such flow pattern transition.

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