旋轉鼓中顆粒表面粗糙度對於潛變流動影響之研究

張威慶

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旋轉鼓中顆粒表面粗糙度對於潛變流動影響之研究

Influence of particle surface roughness on granular creeping motion in rotating drum

張威慶 , Masters　　Advisor：蕭述三　　

繁體中文

顆粒流；潛變流；旋轉鼓；核心；流動層；粗糙度； granular flow, ； creeping motion ； rotating drum ； core ； flowing layer ； roughness

Abstract │ Reference (51) │ Altmetrics

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This thesis is aimed to the effect of particles surface roughness on granular flow in a quasi-two dimensional rotating drum. The dynamic behavior of creeping flow under the flowing layer is discussed. The core is found in the center of rotating drum as fill ratio lager than 50%. The size of the core in the center of the rotating drum decreases as the drum rotating number increasing. This is so-call core erosion. The rotating speed of the core is larger than the rotating speed of the drum. This is so-call core precession. 
Two different surface roughness of glass particles with 4mm diameter are used in the experiment. The rougher particles are roughened by a ball mill equipment with silicon carbide grit. The experiments are performed in five different fill rates in a 50 cm diameter rotating drum. A model from the literature based on the two regions of velocity profile is adopted to investigate the core dynamic. Depend on this model, the experimental results show that the characteristic length yR0R and the shear rate in the flowing layer both are dependent on the particles surface roughness. The characteristic length is larger for the rough surface of particle and larger at high fill rate. The shear rates are smaller for the rough surface of particle and smaller at high fill rate. The shear rates dominate the core precession and the characteristic length dominates the core erosion. Therefore, dynamic behavior of the core in the rotating drum is also different with different surface roughness of particles and different fill ratio. Core precession rate is smaller for the rough surface of particles and larger at high fill ratio. The core erosion rate is larger for the rough surface of particles and larger at high fill ratio.
Although there exists discrepancies between core dynamic model predictions and experimental measurement for the values of core precession rate and core erosion rate. The tendencies of the results from model prediction are in agreements with the experimental data for core precession and erosion.

Reference ( 51 ) 〈TOP〉

[1] Fuerstenau, D. W., Lutch, J. J. and De, A., “The effect of ball size on the energy efficiency of hybrid high-pressure roll mill/ball mill grinding,” Powder Technology, Vol. 105, No. 1-3, pp. 199-204, 1999.
連結：
[2] Belyakov, A., Sakai, Y., Hara, T., Kimura, Y. and Tsuzaki, K., “Effect of dispersed particles on microstructure evolved in iron under mechanical milling followed by consolidating rolling,” Metallurgical and Materials Transactions A, Vol. 32, No.7, pp. 1769-1776, 2001.
連結：
[3] Yasmin, A., Abot, J. L. and Daniel, I. M., “Processing of clay/epoxy nanocomposites by shear mixing,” Scripta Materialia, Vol. 49, No. 1, pp. 81-86, 2003.
連結：
[4] Parker, D. J., Dijkstra, A. E., Martin, T. W. and Seville, J. P. K., “Positron emission particle tracking studies of spherical particle motion in rotating drums,” Chemical Engineering Science, Vol. 52, No. 13, pp. 2011-2022, 1997.
連結：
[5] Mellmann, J., “The transverse motion of solids in rotating cylinders - forms of motion and transition behavior,” Powder Technology, Vol. 118, No. 3, pp. 251-270, 2001.
連結：

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