Flow-regime transitions in fluidized beds of non-spherical particles

作     者：H. Kruggel-Emden K. Vollmari 

作者机构：Ruhr-Universitaet Bochum Universitaetsstrasse 150 D-44780 Bochum Germany 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2016年第14卷第6期

页      面：1-15页

核心收录：

学科分类：080706[工学-化工过程机械] 080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：support by the DFG - KR 3446/6-1 

主　　题：Fluidized bed Flow regimes Non spherical particles Pressure drop and fluctuations Bed height 

摘      要：Fluidized beds frequently involve non-spherical particles, especially if biomass is present. For spheri- cal particles, numerous experimental investigations have been reported in the literature. In contrast, complex-shaped particles have received much less attention. There is a lack of understanding of how par- ticle shape influences flow-regime transitions. In this study, differently shaped Geldart group D particles are experimentally examined. Bed height, pressure drop, and their respective fluctuations are analyzed. With increasing deviation of particle shape from spheres, differences in flow-regime transitions occur with a tendency for the bed to form channels instead of undergoing smooth fluidization. The correlations available in the literature for spherical particles are limited in their applicability when used to predict regime changes for complex-shaped particles. Hence, based on existing correlations, improvements are derived.