scholarly journals The influence of channel width and inflow rate on the critical opening-size of granular flow in two-dimensional channels

2003 ◽  
Vol 52 (4) ◽  
pp. 875
Author(s):  
Xu Guang-Lei ◽  
Hu Guo-Qi ◽  
Zhang Xun-Sheng ◽  
Bao De-Song ◽  
Chen Wei ◽  
...  
Keyword(s):  
Granular Flow ◽  
Channel Width ◽  
Two Dimensional ◽  
Inflow Rate ◽  
Critical Opening

Factors of the Transition from Dilute Flow to Dense Flow in Two-Dimensional Channel

2003 ◽  
Vol 17 (22n24) ◽  
pp. 4382-4386 ◽  
Author(s):  
Xun-Sheng Zhang ◽  
De-Song Bao ◽  
Guang-Lei Xu ◽  
Guo-Qi Hu ◽  
Zheng-Quan Pan ◽  
...  
Keyword(s):  
Granular Flow ◽  
Channel Width ◽  
Square Root ◽  
Two Dimensional ◽  
Inflow Rate ◽  
Outflow Rate ◽  
Dense Flow ◽  
Flow Case

Granular flow of steel beads from dilute flow to dense flow on an inclined two-dimensional channel is studied. The initial inflow Q0 is always a dilute flow. A transition from dilute to dense is observed when D≤Dc. In the dense flow the outflow rate (Q) depends only on opening (D), given by [Formula: see text]. For different inflow rate Q0 in the dilute flow case, the relation between the transition critical exit width (Dc) and the channel width (W) is given. And in larger inflow, the critical exit width is approximately in proportion to the square root of inflow rate, [Formula: see text].

scholarly journals The effect of channel width on the distribution of two-dimensional granular flow in an inclined channel

2005 ◽  
Vol 54 (2) ◽  
pp. 798
Author(s):  
Bao De-Song ◽  
Zhou Ying ◽  
Zhang Xun-Sheng ◽  
Tang Xiao-Wei
Keyword(s):  
Granular Flow ◽  
Channel Width ◽  
Two Dimensional ◽  
Inclined Channel

Numerical Analysis of Bridge Expansion-Induced Rail Deformation of Ballast Truck

2014 ◽  
Vol 580-583 ◽  
pp. 3208-3214 ◽  
Author(s):  
Zhen Wei Xiong ◽  
Xin Ling Liang ◽  
Xian Xing Dai ◽  
Ping Wang
Keyword(s):  
Granular Flow ◽  
Element Model ◽  
Discrete Element Model ◽  
Board Structure ◽  
Vertical Deformation ◽  
Two Dimensional ◽  
Running Safety ◽  
Bridge Plate ◽  
Ballast Track ◽  
The Relationship

when the ballast track stretch with the bridge, ballast which is near expansion joint will move confusedly. As a result, rail produced vertical deformation. The deformation will affect the running safety and comfortability of train. At present, there are two kinds of treatments which are cover board structure and baffle structure to deal ballast’s movement. Aiming at the different modes of stretching when the two kinds of structures and different arrangement condition of bridge plate are applied, the rail-sleeper-ballast discrete element model is developed by the method of two-dimensional granular flow. The relationship between rail deformation and bridge expansion is analyzed on the foundation of the model. Results show as flows: when bridge extends or shortens, rail always produced upwarp deformation. Bridge plate should arrange asymmetrically. Like this, the rail deformation decrease by 40%. And adopting the baffle structure can effectively reduce the influence of bridge expansion in ballast truck.

scholarly journals Effect of boundary on the two-dimensional inclined channel for a dilute granular flow distribution

2004 ◽  
Vol 53 (10) ◽  
pp. 3389
Author(s):  
Zhou Ying ◽  
Bao De-Song ◽  
Zhang Xun-Sheng ◽  
Lei Zhe-Min ◽  
Hu Guo-Qi ◽  
...  
Keyword(s):  
Granular Flow ◽  
Flow Distribution ◽  
Two Dimensional ◽  
Inclined Channel

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.

scholarly journals Dilute granular flow distribution near roughboundary on a two-dimensional inclined channel

2005 ◽  
Vol 54 (3) ◽  
pp. 1279
Author(s):  
Bao De-Song ◽  
Zhou Ying ◽  
Zhang Xun-Sheng ◽  
Tang Xiao-Wei
Keyword(s):  
Granular Flow ◽  
Flow Distribution ◽  
Rough Boundary ◽  
Two Dimensional ◽  
Inclined Channel

scholarly journals Numerical Algorithms for Two-Dimensional Dry Granular Flow with Deformable Elastic Grain

2005 ◽  
Author(s):  
H Boateng ◽  
V Elander ◽  
C Jin ◽  
Y Li ◽  
P Vasquez ◽  
...  
Keyword(s):  
Granular Flow ◽  
Numerical Algorithms ◽  
Two Dimensional ◽  
Dry Granular Flow

Rigid intruder inside a two-dimensional dense granular flow: Drag force and cavity formation

2013 ◽  
Vol 87 (3) ◽  
Author(s):  
Evelyne Kolb ◽  
Pierre Cixous ◽  
Niels Gaudouen ◽  
Thierry Darnige
Keyword(s):  
Drag Force ◽  
Granular Flow ◽  
Cavity Formation ◽  
Two Dimensional ◽  
Dense Granular Flow ◽  
Flow Drag
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