An experimental study of the elastic theory for granular flows

2016 ◽  
Vol 28 (8) ◽  
pp. 083303 ◽  
Author(s):  
Tongtong Guo ◽  
Charles S. Campbell
Keyword(s):  
Experimental Study ◽  
Granular Flows ◽  
Elastic Theory

scholarly journals Experimental study of bedrock erosion by granular flows

2008 ◽  
Vol 113 (F2) ◽  
Author(s):  
Leslie Hsu ◽  
William E. Dietrich ◽  
Leonard S. Sklar
Keyword(s):  
Experimental Study ◽  
Granular Flows ◽  
Bedrock Erosion

Experimental Study on Parameters of Duncan-Chang Model for Cement-Soil

2013 ◽  
Vol 641-642 ◽  
pp. 403-409
Author(s):  
Cai Fu Qian ◽  
Xin Jiang Song ◽  
Jie Wu ◽  
Wei Li
Keyword(s):  
Experimental Study ◽  
Calculation Method ◽  
Confining Pressure ◽  
Elastic Theory ◽  
Triaxial Tests ◽  
Stress Strain ◽  
Pressure Decrease ◽  
Cement Soil ◽  
Nonlinear Elastic ◽  
Chang Model

The conventional triaxial tests for cement-soil show stronger soften characteristics of cement-soil under low confining pressure. The soften character is weaken as confining pressure decrease. For adopting Duncan-Chang hyperbola model to obtain parameters of cement-soil, the model cannot include the stress-strain soften characteristics of cement-soil, and must be discussed. The paper studies on parameters of Duncan-Chang model using generalized Hooke law and nonlinear elastic theory. The researches show the parameters of k and n are unrelated to soften characteristics of cement-soil; the relation of Rf and σ3 is given by the soften characteristics, Rf influence the soften process directly. The calculation method could be used in E-u model, and has good practical value.

scholarly journals Correction to “Experimental study of bedrock erosion by granular flows”

2008 ◽  
Vol 113 (F2) ◽  
Author(s):  
Leslie Hsu ◽  
William E. Dietrich ◽  
Leonard S. Sklar
Keyword(s):  
Experimental Study ◽  
Granular Flows ◽  
Bedrock Erosion

SCALING PROPERTY OF THE DILUTE-DENSE TRANSITION IN 2D GRANULAR FLOWS

2004 ◽  
Vol 18 (17n19) ◽  
pp. 2441-2447 ◽  
Author(s):  
MEIYING HOU ◽  
WEI CHEN ◽  
TONG ZHANG ◽  
KUNQUAN LU ◽  
C. K. CHAN
Keyword(s):  
Experimental Study ◽  
Granular Flow ◽  
Granular Flows ◽  
Critical Value ◽  
Inflow Rate ◽  
Critical Rate ◽  
Jamming Transition ◽  
Variable Λ ◽  
Outflow Rate ◽  
Dense Flow

In this paper we report our experimental study of dilute-dense transition in a 2-dimensional granular flow of particle size d0 and channel width D with confined exit of width d. It is found that a maximum inflow rate Qc exists, above which the outflow changes from dilute to dense and the outflow rate Q(t) drops abruptly from Qc to a dense flow rate Qd. The re-scaled critical rate qc(≡Qc/(D/d0)) is found to be a function of a scaling variable λ only, i.e. qc~F(λ), and [Formula: see text]. The form of this new variable λ suggests that the dilute-to-dense transition is a global property of the flow; unlike the jamming transition, which depends only on [Formula: see text]. It is also found that this transition occurs when the area fraction of particles near the exit reaches a critical value 0.65±0.03.

Experimental study of two-dimensional, monodisperse, frictional-collisional granular flows down an inclined chute

2006 ◽  
Vol 18 (12) ◽  
pp. 123302 ◽  
Author(s):  
Weitao Bi ◽  
Renaud Delannay ◽  
Patrick Richard ◽  
Alexandre Valance
Keyword(s):  
Experimental Study ◽  
Granular Flows ◽  
Two Dimensional

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

Sign in / Sign up

Export Citation Format

Share Document