垂直式振動床中漿態系統下不同黏度間隙流體對大顆粒與其動態行為的影響

林育賢

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垂直式振動床中漿態系統下不同黏度間隙流體對大顆粒與其動態行為的影響

The Brazil-nut effect in a quasi-2D vertical vibrated granular bed, in slurry system the larger particle with difference viscosity of interstitial liquid

林育賢 , Masters　　Advisor：蕭述三　　

繁體中文

間隙流體黏度；粒子流；巴西豆現象；振動床；漿態系統； Granular flow ； Slurry System ； Vibrated Bed ； Braz

Abstract │ Reference (117) │ Altmetrics

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This study investigates experimentally the Brazil-nut effect in a quasi-2D vertical vibrated granular bed, in slurry system the larger particle (or the so-called intruders) with difference viscosity of interstitial liquid. The Brazil nut effect means the larger particle rises to the top of the container and the smaller granular move to the bottom. The dynamics of the larger particle is recorded by using a high speed camera. By using image processing technology and the particle tracking method, the rise dynamic of the intruder was successfully measured and analyzed.
This study demonstrates that the interstitial fluid viscosity plays an important role in the rise dynamics of intruder in slurry system. The effects of vibration conditions and viscosity of interstitial liquid on the dynamics of intruder are investigated in the study. The results show that the rising time and drag force increases with increasing viscosity of interstitial liquid. But the rising velocity and penetration length decreases with increasing viscosity of interstitial liquid. It also shows that the rising time becomes slower as the smaller dimensionless vibration acceleration and the larger vibration frequency is applied in the granular system. Finally the rising velocity is enhanced with the increase of dimensionless vibration acceleration and is reduced with the increase of vibration frequency.

Reference ( 117 ) 〈TOP〉

Vertically Vibrated Beds of Granules,” Physical Review E, Vol. 54, pp. 874-883.
連結：
Bagnold, R.A., 1954, “Experiments on a Gravity-Free Dispersion of Large Solid Spheres in a
連結：
Effect: Competition Between Percolation and Condensation,” Physical Review Letters,
連結：
Vol. 90, 014302.
連結：
Induced Segregation in a Granular Mixture,” European Physical Journal Special Topics,
連結：

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