Particle-mixing and volumetric expansion in a vibrated granular bed

Melany L. Hunt, Shu San Hsiau, Karen T. Hong

研究成果: 書貢獻/報告類型會議論文篇章同行評審

摘要

The present experiments are an investigation of the expansion and mixing that occurs in a horizontal bed of particles subjected to vibrational accelerations in the direction parallel to gravity. The particles are colored-glass balls of uniform size; three different bed heights are examined of 6, 9 and 12 particle diameters. The vibrational frequency and amplitude are controlled separately to cover a range of acceleration levels from 1 to 5.5 times gravitational acceleration (g). The expansion results show that above a critical frequency, the beds begin to expand and the bed solid fraction decreases. This result is independent of the vibrational amplitude. Above a second critical frequency, the thickest beds show a further decrease in solid fraction; the minimum value of solid fraction for all bed heights is approximately 0.21. The mixing results indicate that the mixing times decreased significantly with the expansion of the bed. However, the mixing times are greater as the bed depth increase. In addition, the mixing times depend on the amplitude of the vibration. A simple analysis of the flow is performed using a self-diffusion coefficient developed from dense-gas kinetic theory. The analysis qualitatively agrees with the experiments for the largest vibrational velocities and for the thinner beds.

原文???core.languages.en_GB???
主出版物標題Heat Transfer in Food Processing
發行者Publ by ASME
頁面69-75
頁數7
ISBN(列印)0791811670
出版狀態已出版 - 1993
事件29th National Heat Transfer Conference - Atlanta, GA, USA
持續時間: 8 8月 199311 8月 1993

出版系列

名字American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
254
ISSN(列印)0272-5673

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???event.eventtypes.event.conference???29th National Heat Transfer Conference
城市Atlanta, GA, USA
期間8/08/9311/08/93

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