Influence of vibration on granular flowability and its mechanism of aided flow

被引:1
|
作者
Wu, AX [1 ]
Sun, YZ [1 ]
Li, JH [1 ]
机构
[1] Cent S Univ, Coll Resources Environm & Civil Engn, Changsha 410083, Peoples R China
来源
JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY | 2001年 / 8卷 / 04期
基金
中国国家自然科学基金;
关键词
granular media; vibrating aided flow; body wave; mechanism;
D O I
10.1007/s11771-001-0065-9
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Regarding flowing granular media as weak transverse isotropic media, the phase velocity expressions of wave P, wave SH and wave SV were deduced, the propagation characteristics of waves in flowing granular media were analyzed. The experiments show that vibration has great influence on granular fluidity. The wavefront of wave P is elliptic or closely elliptic, the wavefront of wave SH is elliptic, and the wavefront of wave SV is not elliptic. Wave propagation in the granular flowing field attenuates layer after layer. The theory and experiment both substantiate that the density difference is the key factor which leads to the attenuation of vibrating energy. In terms of characteristics of wave propagation one can deduce that vibrating waves have less influence on flowability of granules when the amplitude and frequency are small. However, when the amplitude and frequency increase gradually, the eccentricity of ellipsoid, the viscosity resistance and inner friction among granules, and shear intensity of granules decrease, and the loosening coefficient of granules increases, which shows the granules have better flowability.
引用
收藏
页码:252 / 257
页数:6
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