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碩士 === 國立中央大學 === 機械工程研究所 === 94 === This thesis examines the segregation phenomena of binary granular material subjected to external sheared force. This type of flow in a shear cell is known as Couette flow in fluid mechanics. The influence of both the bottom wall velocity and solid fraction of gra...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2006
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| Online Access: | http://ndltd.ncl.edu.tw/handle/srbfp4 |
| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 94 === This thesis examines the segregation phenomena of binary granular
material subjected to external sheared force. This type of flow in a shear
cell is known as Couette flow in fluid mechanics. The influence of both
the bottom wall velocity and solid fraction of granular material on the
segregation behaviors are discussed.Experiments are performed in a shear
cell device and the glass spheres are used as granular materials. The
motions of the granular materials are recorded by a high-speed camera.
Image processing technology and particle tracking method are employed
to measure the average and fluctuation velocities in the streamwise and
the transverse directions. Two models are used to describe segregation
level and an index called intensity of segregation, Is, is employed to
quantify the segregation quality. The initial segregation rate is calculated
from a least-square fit using the time evolution of Is. Three bi-directional
stress gages are installed on the upper wall to measure the nomal and
shear stresses.
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