TY - JOUR

T1 - The liquid and solid states of highly dissipative vibrated granular columns

T2 - One-dimensional computer simulations

AU - Alexeev, A.

AU - Goldshtein, A.

AU - Shapiro, M.

N1 - Funding Information:
This research was supported by the Israel Science Foundation administered by the Israel Academy of Sciences and Arts, by the Center of Absorption in Science and the Gilleady Program for Immigrant Scientists Absorption, by the Fund for the Promotion of Research at the Technion and by the Technion V.P.R. Fund–Smoler Research Fund. A.G. is grateful to Prof. L.P. Kadanoff for fruitful discussions.

PY - 2002/2/18

Y1 - 2002/2/18

N2 - One-dimensional arrangements of inelastically colliding spheres moving in a vertically oscillating vessel in the gravity field are investigated numerically. These arrangements are used to study the liquid and solid states of layers composed of granules with high energy dissipation properties. We found that the liquid state may be characterized by the kinetic energy of the particles' relative motion, Erel, and the particles' mean free path, λ. The layers' dissipative properties may be characterized by parameter D1 = N(1-e1) where N is the particle number, e1 the particles' restitution coefficient measured for a binary particle collision with a fixed relative velocity. For highly dissipative layers, i.e., those with D1 > 3, maximal value of Erel is found to be independent of D1, proportional to the square of vibrational amplitude and frequency, and inversely proportional to N2/3. The mean free path λ is found to have minimum when D1 is about 3 and increases when D1 > 3. This occurs because of the layer's interchangeable transitions between two granular states: liquid and solid. The vibrational regimes, where in spite of extensive vibrations, the layer prevails in the solid state, were investigated. A stability criterion of the solid state was derived in terms of a critical vibrational amplitude. This critical amplitude is independent of the layers' dissipative properties and proportional to N5/3. The results of the simulation are compared with the experimental data obtained for 2-D vibrated granular layers.

AB - One-dimensional arrangements of inelastically colliding spheres moving in a vertically oscillating vessel in the gravity field are investigated numerically. These arrangements are used to study the liquid and solid states of layers composed of granules with high energy dissipation properties. We found that the liquid state may be characterized by the kinetic energy of the particles' relative motion, Erel, and the particles' mean free path, λ. The layers' dissipative properties may be characterized by parameter D1 = N(1-e1) where N is the particle number, e1 the particles' restitution coefficient measured for a binary particle collision with a fixed relative velocity. For highly dissipative layers, i.e., those with D1 > 3, maximal value of Erel is found to be independent of D1, proportional to the square of vibrational amplitude and frequency, and inversely proportional to N2/3. The mean free path λ is found to have minimum when D1 is about 3 and increases when D1 > 3. This occurs because of the layer's interchangeable transitions between two granular states: liquid and solid. The vibrational regimes, where in spite of extensive vibrations, the layer prevails in the solid state, were investigated. A stability criterion of the solid state was derived in terms of a critical vibrational amplitude. This critical amplitude is independent of the layers' dissipative properties and proportional to N5/3. The results of the simulation are compared with the experimental data obtained for 2-D vibrated granular layers.

KW - Liquid state

KW - Simulations

KW - Solid state

KW - Vibrated granular columns

UR - http://www.scopus.com/inward/record.url?scp=0037128116&partnerID=8YFLogxK

U2 - 10.1016/S0032-5910(01)00436-3

DO - 10.1016/S0032-5910(01)00436-3

M3 - 文章

AN - SCOPUS:0037128116

SN - 0032-5910

VL - 123

SP - 83

EP - 104

JO - Powder Technology

JF - Powder Technology

IS - 1

ER -