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 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 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.

Factors influencing the density profiles of granular flux in a two-dimensional inclined channel

2009 ◽  
Vol 52 (6) ◽  
pp. 869-872
Author(s):  
DeSong Bao ◽  
Ying Zhou ◽  
XunSheng Zhang ◽  
XiaoWei Tang
Keyword(s):  
Two Dimensional ◽  
Density Profiles ◽  
Inclined Channel ◽  
Factors Influencing

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 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

A Simple Model for Fluid Flow and Particle Motion Inside the Human Larynx

Volume 4 ◽  
2004 ◽  
Author(s):  
C. Ersahin ◽  
I. B. Celik ◽  
O. C. Elci ◽  
I. Yavuz ◽  
J. Li ◽  
...  
Keyword(s):  
Flow Field ◽  
Particle Deposition ◽  
Flow Distribution ◽  
Axial Direction ◽  
Correction Method ◽  
Accurate Solution ◽  
Two Dimensional ◽  
Transient Model ◽  
One Dimensional ◽  
Dimensional Flow

This study aims to develop a simple and quick, but sufficiently accurate solution method for calculating the air flow and tracking the particles in a complex tubular system, where the flow changes its magnitude and direction in a periodic manner. The flow field is assumed to be quasi-two-dimensional and a pressure-correction method is employed to calculate the spetio-temporal variation of the air velocity inside the larynx. Then, the calculated one-dimensional flow distribution is used to reconstruct a two-dimensional flow field is constructed based on the average velocity along the axial direction. The system geometry is taken as close as possible to the actual larynx for an average person with an average glottis opening. For the current study the walls of the larynx is approximated as rigid walls, but different ways to account for compliant walls are proposed within the context of the one-dimensional mode. The 1-D transient model is validated against a two-dimensional model using a verified commercial code. Particles are introduced into the system and tracked during every time fraction of the respiratory cycle. Then, the histograms of particles that come into contact with the larynx are calculated, and regions with a higher probability for particle deposition are identified.

Effects of System Rotation on the Performance of Two-Dimensional Diffusers

1976 ◽  
Vol 98 (3) ◽  
pp. 422-429 ◽  
Author(s):  
P. H. Rothe ◽  
J. P. Johnston
Keyword(s):  
Rotation Number ◽  
Rectangular Cross Section ◽  
Flow Distribution ◽  
Suction Side ◽  
Area Ratio ◽  
Pressure Recovery ◽  
Centrifugal Impeller ◽  
Two Dimensional ◽  
Recovery Coefficient ◽  
Coriolis Acceleration

Experiments with incompressible flow are reported concerning the effects of Coriolis acceleration on flow separation and on separated flow in plane-wall diffusers of rectangular cross section. The diffusers were rotated about an axis perpendicular to the plane of the nearly two-dimensional flow in order to simulate some features of the blade-to-blade flow distribution in the radial portion of the centrifugal impeller. Various stall regimes are mapped on coordinates of rotation number and diffuser area ratio (at fixed wall length). Diffuser pressure-recovery coefficient is reported as a function of area ratio and rotation number. These data demonstrate that, by suppressing turbulent mixing and shear stress in the suction-side boundary layers, the Coriolis acceleration field greatly enhances the tendency for stall to appear in a diffuser. This effect causes a corresponding reduction in the throat-to-exit pressure recovery as compared to that of nonrotating diffusers of the same geometry and inlet flow blockage.

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