Dynamic stress chain formation in a two-dimensional particle bed

2002 ◽  
Vol 42 (3) ◽  
pp. 329-337 ◽  
Author(s):  
Keith M. Roessig ◽  
Joseph C. Foster ◽  
Scott G. Bardenhagen
Keyword(s):  
Dynamic Stress ◽  
Two Dimensional ◽  
Chain Formation ◽  
Particle Bed ◽  
Stress Chain

scholarly journals Study of Clogging Phenomenon for a Conical Hopper: The Influence of Particle Bed Height and Hopper Angle

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Muhammad Hammad Khalid ◽  
Yixian Zhou
Keyword(s):  
Contact Pressure ◽  
Granular Flow ◽  
Experimental Result ◽  
Two Dimensional ◽  
Pebble Bed ◽  
Discrete Particle ◽  
Pebble Bed Reactors ◽  
Bed Height ◽  
Particle Bed ◽  
Conical Hopper

The granular flow is one of the principal issues for the design of pebble bed reactors. Particularly, the clogging phenomenon raises an important issue for pebble bed reactors. In this paper, we conduct experiments and discrete particle simulation of two-dimensional discharge granular flow from a conical hopper, to study the effect of the particle bed height h and hopper angle α on the clogging phenomenon. In general, the clogging probability J increases with height h and starts to saturate when h is larger than a critical value. The experimental result trends are supported by discrete simulations. To understand the underlying physical mechanism, we conduct discrete particle simulations for various h values, focusing on the following parameters: the statistical averaging of the volume fraction, velocity, and contact pressure of particles near the aperture during the discharge. We found that, among all relevant variables, the contact pressure of particles is the main cause of the increasement of J when h increases. An exponential law between the pebble bed h and clogging probability J has been established based on these observations and Janssen model. As for hopper angle α , J shows an almost constant behavior for any rise in α followed by a sudden regression at α = 75 ° . Surprisingly, the effect of α is most obvious for intermediate values of h , where we observe a sharp increasement of clogging probability. The same trend is observed in the two-dimensional discrete simulation results.

Organometallic ring vs. chain formation beyond kinetic control: steering their equilibrium in two-dimensional confinement

2018 ◽  
Vol 54 (70) ◽  
pp. 9741-9744 ◽  
Author(s):  
Claudio K. Krug ◽  
Qitang Fan ◽  
Florian Fillsack ◽  
Johannes Glowatzki ◽  
Nicole Trebel ◽  
...  
Keyword(s):  
Kinetic Control ◽  
Two Dimensional ◽  
Thermodynamic Control ◽  
Chain Formation

Two-dimensional confinement enables thermodynamic control over the competition between macrocycle and chain formation.

Bubble Characteristics and Fluctuation of Pressure and Particle Bed in Two-Dimensional Pulsated Fluidized Bed.

2002 ◽  
Vol 28 (1) ◽  
pp. 121-124
Author(s):  
Akira Nishimura ◽  
Hiroshi Hoshino ◽  
Noriyuki Kobayashi ◽  
Masanobu Hasatani
Keyword(s):  
Fluidized Bed ◽  
Two Dimensional ◽  
Particle Bed ◽  
Bubble Characteristics
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