[1]王 怡,樊 航,任晓芬.自由下落非均一粒径颗粒流的流场特性[J].西安建筑科技大学学报:自然科学版,2015,47(03):418-422.[doi:10.15986/j.1006-7930.2015.03.020]
　WANG Yi,FAN Hang,REN Xiaofen.Flow characteristics of free-fall particles with non-uniform particle diameter[J].J.Xi’an Univ. of Arch. & Tech.:Natural Science Edition,2015,47(03):418-422.[doi:10.15986/j.1006-7930.2015.03.020]
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自由下落非均一粒径颗粒流的流场特性()
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西安建筑科技大学学报:自然科学版[ISSN:1006-7930/CN:61-1295/TU]

卷:
47
期数:
2015年03期
页码:
418-422
栏目:
出版日期:
2015-06-30

文章信息/Info

Title:
Flow characteristics of free-fall particles with non-uniform particle diameter
文章编号:
1006-7930(2015)03-0418-05
作者:
王 怡1; 樊 航1; 任晓芬1; 2
(1 西安建筑科技大学环境与市政工程学院,陕西 西安 710055;2 河北工程大学城市建设学院,河北 邯郸 056038)
Author(s):
WANG Yi 1;  FAN Hang 1;  REN Xiaofen 1; 2
(1 School of Environment and Municipal Engineering, Xi’an Univ. of Arch. & Tech., Xi’an 710055, China; 2 Institute of Urban Construction, Hebei University of Engineering, Handan 056038, China)
关键词:
非均一粒径; 颗粒速度; 气流分布; 数值模拟; 自由下落
Keywords:
non-uniform particle diameter;  velocity of particle;  the velocity distribution;  numerical simulation;  free-fall
分类号:
TU834
DOI:
10.15986/j.1006-7930.2015.03.020
文献标志码:
A
摘要:
利用DPM-CFD 模型对非均一粒径颗粒流自由下落过程中气流速度的分布规律、颗粒的扩散和运动特性进行了研究， 模拟结果与实验及理论吻合良好．研究发现，空气在轴心处形成射流，其周围有漩涡产生；气流速度沿径向先减小后增加， 之后再次呈现下降趋势，在轴心处速度最大，且沿轴向增加；颗粒物浓度沿径向减小，扩散半径随粒径减小而增加；随着颗粒流的下落，颗粒速度的增幅由快到慢，逐渐趋于平缓；在小颗粒中混入大颗粒可使小颗粒沉降速度减小．
Abstract:
Present paper presents a research of the air velocity distributions, particle diffusion and particle movement characteristic of free-fall particles with non-uniform particle diameter based on DPM-CFD model. The simulation results well matched the experimental and theoretical data. The research found that air jet forms in the axis, and vortex is produced around axis. The axis line air velocity is at a maximum, increased as the axial increasing. Besides, with the radial distance increasing, the airflow velocity increases firstly and then decreases and then increases again. The particle concentration decreases along the radial direction, and the diffusion radius increases with decreasing particle size. The particle velocity rapidly increases in the initial phase, and then gradually flatten; With the particles falling down, the increasing amount of particle velocity become smaller and smaller, and then gradually flattens; Terminal velocity of small-size particles decreases, mixed with large-size particles.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期：2015-01-15   修改稿日期：2015-05-25
基金项目：国家自然科学基金重点项目(51238010); 国家杰出青年基金项目(51425803)
作者简介：王怡（1970-），女，教授，博士生导师，主要从事建筑通风理论及其在实际中应用研究．Email：wangyi6920@126.com
更新日期/Last Update: 2015-09-01