李素芬

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:女

毕业院校:大连理工大学

学位:硕士

所在单位:能源与动力学院

办公地点:能源与动力学院718室

联系方式:13084159090

电子邮箱:lisuf@dlut.edu.cn

扫描关注

论文成果

当前位置: 中文主页 >> 科学研究 >> 论文成果

Experimental and theoretical analyses on the effect of physical properties and humidity of fly ash impacting on a flat surface

点击次数:

论文类型:期刊论文

发表时间:2018-03-01

发表刊物:JOURNAL OF AEROSOL SCIENCE

收录刊物:SCIE、EI

卷号:117

页面范围:85-99

ISSN号:0021-8502

关键字:Collision characteristics; Capillary force; Physical property; Experimental method; Theoretical method

摘要:This study investigated the particle-wall collision characteristics of different fly ash particles against a flat surface under dry and humid conditions by experimental and theoretical analyses. The experiment could be applied to simulate the particle deposition in many engineering fields, such as electrostatic precipitators (ESPs), filtration, and agglomerates. The coal used are bituminous coal from Fushun, Liaoning Province (LN) and meager coal from Zhundong, Xinjiang Province (XJ), which are turned into fly ash particles with a diameter of approximately 7 mu m using a muffle furnace. The experimental system is designed for an aerosol inlet particle velocity range of 1-7 m/s. A dynamic model is developed to calculate the damping coefficient, contact time, critical impact velocity, and contact displacement under both dry and humid conditions during impact. The results show that the normal restitution coeffcients decrease with increasing density, Young's modulus, and humid condition. Second, based on the dynamic model calculation, the damping coefficient and contact time are obtained with different impact velocities in a collision. The values of the damping coefficient and contact time are larger under humid conditions due to the effect of capillary force. Third, the critical impact velocity increases under humid condition. Finally, the maximum contact displacement versus the impact velocity and the change of total force and velocity versus the contact displacement during a collision are examined.