Normal stress effects in the gravity driven flow of granular materials

The stability and onset of two-dimensional convection in a rotating fluid saturated porous layer subject to gravity and centrifugal body forces is investigated analytically. The problem corresponding to a layer placed far away from the centre of rotation was identified as a distinct case and therefore justifying special attention. The stability of a basic gravity driven convection is analysed. The marginal stability criterion is established in terms of a critical centrifugal Rayleigh number and a critical wave number for different values of the gravity related Rayleigh number. For any given value of the gravity related Rayleigh number there is a transitional value of the wave number, beyond which the basic gravity driven flow is stable. The results provide the stability map for a wide range of values of the gravity related Rayleigh number, as well as the corresponding flow and temperature fields.

Download Full-text

Gravity-Driven Flow and Clogging in the Presence of an Intruder

Springer Proceedings in Physics - Traffic and Granular Flow 2019 ◽

10.1007/978-3-030-55973-1_45 ◽

2020 ◽

pp. 365-371

Author(s):

Anna Belle Harada ◽

Kerstin Nordstrom

Keyword(s):

Gravity Driven ◽

Gravity Driven Flow

Download Full-text

Modelling gravity-driven flow over uneven surfaces

Advances in Fluid Mechanics VIII ◽

10.2495/afm100261 ◽

2010 ◽

Author(s):

K. A. Ogden ◽

S. J. D. D’Alessio ◽

J. P. Pascal

Keyword(s):

Gravity Driven ◽

Gravity Driven Flow

Download Full-text

Frictional properties between geocells filled with granular material

10.7764/rdlc.20.2.332 ◽

2021 ◽

Vol 20 (2) ◽

pp. 332-345

Author(s):

Gökhan Altay ◽

◽

Cafer Kayadelen ◽

Taha Taskiran ◽

Baki Bagriacik ◽

...

Keyword(s):

Granular Material ◽

Normal Stress ◽

Granular Materials ◽

Direct Shear ◽

Shear Tests ◽

Direct Shear Tests ◽

Frictional Properties ◽

Geotechnical Structures ◽

Series Of Experiments ◽

Restricted Volume

The parameters concerning the interaction between geocell and granular materials is required for the design of many geotechnical structures. With this in mind, a series of experiments using simple direct shear tests are conducted in order to understand the frictional properties between geocells filled with granular materials. The 54 test samples are prepared by filling the geocell with granular materials having three different gradations. These samples are tested at three different relative densities under three different normal stress levels. As a result, it was observed that interface resistance between the geocells filled with granular material is found to be generally greater than in the samples without geocells. Additionally, these samples with geocells are found to be stiffer; this is due to the fact that the samples with geocell gained more cohesion because geocells confined the grains within a restricted volume.

Download Full-text