Results 261 to 270 of about 81,279 (338)

Experimental investigation of pile characteristics of non-spherical particles mixtures: pile height and angle of repose

Journal of Physics: Conference Series, 2022
An angle of repose is defined as the steepest angle of a conical pile that is naturally formed when a bulk of particulate solid is poured onto a flat surface.
P. M. Widartiningsih, M. I. R. Putra, D. P. P. Aji, A. Rudiawan, S. Viridi   +4 more
semanticscholar   +1 more source

DEM study of the angle of repose and porosity distribution of cylindrical particles with different lengths

International journal of Chemical Reactor Engineering, 2021
Effect of the length of cylindrical particle on repose angle and porosity of a pile was numerically studied using discrete element method. The variation of repose angle and porosity with coefficient of sliding and rolling friction were also discussed ...
Heng Zhou, Xu Tian, Xingyu Guo, Ming-yin Kou, Shengli Wu, Yansong Shen, Yang You   +6 more
semanticscholar   +1 more source

Relaxation at the Angle of Repose

Physical Review Letters, 1989
We have investigated the distribution of avalanches which occur when the slope of a sandpile exceeds the metastable slope given by the angle of repose. In contradiction to recent models by Bak, Tang, and Wiesenfeld for the dynamics of granular systems, we do not observe power-law distributions. We also find that the slope of a sandpile decays as $log(t)
, Jaeger, , Liu, , Nagel
openaire   +2 more sources

Angles of repose that exceed modern angles

Geology, 1990
Angles of repose for naturally occurring materials are known to be a function of, among other geologic parameters, the acceleration of gravity and cohesion between particles. Thus, steeper angles may have been recorded in ancient sediments because Earth9s acceleration of gravity was less than now.
C. John Mann, Sherman P. Kanagy II
openaire   +1 more source

Geometric effect of angle of repose revisited

Granular Matter, 2014
We report on a universal pattern observed in the collapse dynamics of a sand heap. Collapse dynamics of a three-dimensional sand heap were studied through experiments and numerical simulations. A phenomenological law that describes the shape of a collapsed sand heap was found, we call this the geometric constitutive law of friction.
Miki Y. Matsuo, Daisuke Nishiura, Hide Sakaguchi   +2 more
openaire   +1 more source

A rapid method for estimating the angle of repose and volume of grain piles using terrestrial laser scanning

Remote Sensing Letters, 2020
The angle of repose and volume of granular piles are important measures in many fields. This letter presents a new method for rapid estimation of the angle of repose and volume of grain piles using terrestrial laser scanning data acquired from a single ...
Mei Liu, P. Dong, Ruofei Zhong
semanticscholar   +1 more source

Flow Rates and Repose Angles of Wet-Processed Granulations

Journal of Pharmaceutical Sciences, 1977
The equation of McDougall and Evans was found not to apply to granulations. The functional relationships among volumetric powder flow rates, angles of repose, and particle size were demonstrated to exhibit maxima (rather than minima) in five common pharmaceutical granulations produced by wet processing.
J T, Carstensen, P C, Chan
openaire   +2 more sources

Measurement of the Repose Angle of aTablet Granulation*

Journal of the American Pharmaceutical Association (Scientific ed.), 1955
In order to study the problem of granulation flow in tableting as it is related to interparticle friction, the response angle of a sulfathiazole granulation was studied as a function of average particle size, presence of lubricants, and admixture of fines.In general, the repose angle increased with decreasing particle size.Talc added to granules in ...
openaire   +2 more sources

Angle of repose and internal friction

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1966
Abstract The relation between angle of repose and angle of internal friction in a fragmented mass is discussed, and experiments with crushed rocks are reported. It is concluded that the angle of repose is not generally the angle of internal friction of the material in the pile, but of the same material in a more closely packed condition.
openaire   +1 more source

Angles of repose, angles of shearing resistance and angles of talus slopes

Earth Surface Processes, 1977
Recent arguments that the straight parts of talus slopes stand, in general, at angles less than the angle of repose of the talus material are considered in relation to different test procedures used in the measurement of the repose angle. Observations on coarse, well sorted, angular fragments showed no significant difference between the values for this
openaire   +1 more source