YAN Xuea , ZHANG Wansonga , DENG Youxiana , YAN Chaoyub , WEI Yaodongb
（a. College of Science; b. State Key Laboratory of Heavy Oil Processing, China University of Petroleum （Beijing）, Beijing 102249, China）
Abstract： The particle down flowing velocity in an experimental standpipe with internal diameter of 150 mm and height of 5 000 mm was measured by a particle velocity measuring instrument. The particle materials used in the experiment were fluid catalytic crack（FCC） catalysts. Making an analogy with laminar flow and turbulent flow in fluid mechanics, Reynolds number of the granular flow in the standpipe was used to determine the granular flow pattern. The results show that in the standpipe there are three critical Reynolds numbers which are Rep1、Rep2 and Rep3. The flow behavior of granular in the standpipe can be classified as four flow patterns depending on Reynolds number, namely, intermittent dense flow, fluctuating dense flow, transitional period from dense flow to dilute flow, and dilute flow status.
Keywords: standpipe； granular flow; Reynolds number; flow pattern
中图分类号：O35 文献标志码：A
文章编号：1008-5548（2014）06-0014-03
DOI:10.13732/j.issn.1008-5548.2014.06.003
收稿日期：2014-02-28， 修回日期：2014-03-17，在线出版时间：2014-12-22。
基金项目：国家自然科学基金项目，编号：21176250；中国石油大学（北京）基本科研基金项目，编号：KYJJ2012-03-13。
第一作者简介：闫雪（1987—），女，硕士，助理工程师，研究方向为气-固两相流及颗粒物质。 电话：010-89733909，E-mail:784658821@qq.com。
通信作者简介：严超宇（1977—），男，博士，副教授，研究方向为气-固两相流领域以及旋风分离器。 E-mail: yanchaoyu@sina.com。
