探讨激振频率和容器宽度对颗粒层中对流的影响  

Influence of exciting frequency and container width on convection in vibrating granular layers

作　　者：孔维姝[1] 胡林[1] 李世雄[1] 张兴刚[1] 白光富[1] 胡云[1] 赵智洋[1] 贺沙白[1] 

机构地区：[1]贵州大学理学院贵州光电子技术与应用重点实验室,贵阳550025

出　　处：《振动与冲击》2010年第4期88-91,共4页Journal of Vibration and Shock

基　　金：贵州省科技厅基金(批准号:20072003);国际合作项目(批准号:2007-400112);贵州省省长基金(批准号:2006-15);组织部高层次人才特助基金(批准号:2006008)

摘　　要：竖直振动激励下准二维颗粒层中对流运动受激振频率f和容器宽度L的影响,实验结果表明,对流卷的个数和对流运动的方向强烈地依赖于激振频率而对容器宽度不太敏感。对流运动的强度受激振频率f和容器宽度L的影响都较大,当容器宽度一定时,对流运动的强度随激振频率振荡变化。当频率一定时,容器宽度L存在一个临界值Lc,当L<Lc时,随着L的增加,对流运动的强度增加;当L>Lc时,随着L的增加,对流运动的强度反而减小。The influence of exciting frequency f and container width L on the convective motion of granulas in a vertically vibrating quasi-two-dimensional vessel was studied.The experimental results showed that the number of convection rolls and the direction of the convective motion are strongly dependent on the exciting frequency,but not sensitive to the container width;the exciting frequency and the container width both strongly affect the convection intensity;if L keeps unchanged,the convection intensity varies oscillatorily with f;if f keeps unchanged,there is a critical container width Lc;the convection intensity increases with L,when L< Lc;and the convection intensity decreases with L,when L>Lc.

关 键 词：颗粒物质 对流 能量耗散 

分 类 号：X701[环境科学与工程—环境工程]