Flow properties of particles in a model annular shear cell

2012 ◽  
Vol 24 (5) ◽  
pp. 053301 ◽  
Author(s):  
X. Wang ◽  
H. P. Zhu ◽  
A. B. Yu
Keyword(s):  
Flow Properties ◽  
Shear Cell ◽  
Annular Shear Cell

Explicit Finite Element Simulation of Granular Flow in an Annular Shear Cell

2009 ◽  
Author(s):  
M. A. Kabir ◽  
C. F. Higgs ◽  
M. R. Lovell ◽  
V. Jasti ◽  
M. C. Marinack
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Granular Flow ◽  
High Speed ◽  
Flow Behavior ◽  
Shear Cell ◽  
Explicit Finite Element Method ◽  
Explicit Finite Element ◽  
Annular Shear Cell ◽  
Element Method

Explicit finite element method modeling of granular flow behavior in an annular shear cell has been studied and presented in this paper. The explicit finite element method (FEM) simulations of granular flow in an annular shear cell with around 1633 particles were performed, where the inner wheel rotated at a very high speed and the outer disk remained stationary. The material properties of the particles and the outer wheel were defined as elastic steel whereas the inner wheel was elastic aluminum. In this investigation, the explicit FEM model mimicked granular flow in an experimental set up where the inner wheel was rotated at a speed of 240 rpm. The FEM results for shearing motion and solid fraction were compared with experimental results from a granular shear cell.

Granular Flow Lubrication: Continuum Modeling of Shear Behavior

2004 ◽  
Vol 126 (3) ◽  
pp. 499-510 ◽  
Author(s):  
C. Fred Higgs, ◽  
John Tichy
Keyword(s):  
Boundary Conditions ◽  
Energy Transport ◽  
Granular Flows ◽  
Solid Particles ◽  
Numerical Code ◽  
Flow Properties ◽  
Local Flow ◽  
Shear Cell ◽  
Coupled Boundary Conditions ◽  
Lubricating Mechanism

Because at extreme temperatures, conventional liquid lubrication breaks down, researchers have proposed using flows of solid particles as a lubricating mechanism. The particles may be powders, which tend to coalesce and slide over one another in sustained contact, or granules, which collide with one another in fluctuating motion. Distinction between these two regimes is elucidated. The behavior of various granular flows is studied using a granular kinetic lubrication (GKL) model. Our GKL model is a continuum approach that applies proper rheological constitutive equations for stress, conduction and dissipation to thin shearing flows of granular particles, as well as the most rigorous boundary conditions for momentum and energy transport. A robust numerical code, utilizing Newton’s finite differencing method, is developed to apply GKL theory to the problem of simple shearing flow. The code solves two second-order, coupled nonlinear ordinary differential equations with coupled boundary conditions of the first-order. As a result, new parametric curves for the local flow properties of the large-particle granular flows are constructed. Results from the GKL model agree qualitatively with past experiments using glass granules in an annular shear cell.

The Critical Porosity of Free Flowing Solids

1969 ◽  
Vol 91 (2) ◽  
pp. 478-487 ◽  
Author(s):  
B. Scarlett ◽  
A. C. Todd
Keyword(s):  
Shear Stress ◽  
Size Distribution ◽  
Critical Porosity ◽  
Shear Cell ◽  
Applied Shear Stress ◽  
Novel Design ◽  
Annular Shear Cell

The behavior of samples of free flowing sand under applied shear stress have been investigated in an annular shear cell of novel design. Measurements of critical porosity, dilation and shear stress are reported and discussed. A random chord size distribution is proposed to characterize a bed of particles and a relationship between this parameter and the critical porosity is derived. Experimental and theoretical values are compared.

Granular Collision Lubrication: Experimental Investigation and Comparison to Theory

2007 ◽  
Vol 129 (4) ◽  
pp. 923-932 ◽  
Author(s):  
Karim N. Elkholy ◽  
M. M. Khonsari
Keyword(s):  
Surface Roughness ◽  
Experimental Investigation ◽  
Friction Coefficient ◽  
Kinetic Theory ◽  
Rotational Speed ◽  
Applied Load ◽  
Vertical Displacement ◽  
Shear Cell ◽  
Sliding Motion ◽  
Annular Shear Cell

An experimental investigation of the friction and lift characteristics of granular lubrication is presented. Experiments are carried out to demonstrate the vertical displacement (lift) observed in an annular shear cell apparatus. Results are presented for the friction coefficient as a function of the rotational speed and the applied load for several surface roughness combinations. Simulations of the kinetic theory for the granular material are performed and compared to the experimental results. The experiments provide an evidence for the formation of granular lift between two disks undergoing sliding motion.

Sign in / Sign up

Export Citation Format

Share Document