Influence of interstitial fluid viscosity on transport phenomenon in sheared granular materials

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Title:	Influence of interstitial fluid viscosity on transport phenomenon in sheared granular materials
Authors:	Liao,CC;Hsiau,SS
Contributors:	機械工程研究所
Keywords:	SELF-DIFFUSION;FLOWS
Date:	2009
Issue Date:	2010-06-29 18:02:04 (UTC+8)
Publisher:	中央大學
Abstract:	We report experimental measurements of transport properties on sheared granular materials with different interstitial fluids to study the granular flow behaviors. Four kinds of interstitial fluids are used in the experiments. The ensemble velocities, fluctuation velocities, granular temperature and self-diffusion coefficients are successfully measured by PTV method. The results indicate that the interstitial fluid plays an important role in determining the transport properties of the granular flow. The particles motions are more random and interactive collisions are more serious in a dry system (interstitial fluid of air). The values of fluctuations and granular temperatures are smaller as the interstitial fluid is more viscous resulting in the larger viscous force. The thickness of shear band is about three to eight particle diameters and increases with the decreasing interstitial fluid viscosity. The self-diffusion coefficient of granular materials is also discussed in this study. Both the self-diffusion coefficients and the granular temperature increase with the increasing shear rate. The average streamwise self-diffusion coefficient and granular temperature increase with the increase in Stokes number and Bagnold number. (C) 2009 Elsevier Ltd. All rights reserved.
Relation:	CHEMICAL ENGINEERING SCIENCE
Appears in Collections:	[Graduate Institute of Mechanical Engineering] journal & Dissertation

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