Propagation of surface waves in a halfplane-layer system under the condition of sliding contact between them

A.A. Amirjanyan; M.V. Belubekyan; G.Z Gevorgyan; A.Z. Darbinyan

doi:10.33018/74.2.2

Propagation of surface waves in a halfplane-layer system under the condition of sliding contact between them

Mechanics - Proceedings of National Academy of Sciences of Armenia ◽

10.33018/74.2.2 ◽

2021 ◽

Vol 74 (2) ◽

pp. 18-32

Author(s):

A.A. Amirjanyan ◽

M.V. Belubekyan ◽

G.Z Gevorgyan ◽

A.Z. Darbinyan

Keyword(s):

Surface Waves ◽

Sliding Contact ◽

Layer System

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Stability of a liquid film flowing down an inclined anisotropic and inhomogeneous porous layer: an analytical description

Journal of Fluid Mechanics ◽

10.1017/jfm.2016.613 ◽

2016 ◽

Vol 807 ◽

pp. 135-154 ◽

Cited By ~ 2

Author(s):

P. Deepu ◽

Srinivas Kallurkar ◽

Prateek Anand ◽

Saptarshi Basu

Keyword(s):

Surface Waves ◽

Porous Layer ◽

Fluid Layer ◽

Dominant Role ◽

Analytical Description ◽

Order Effects ◽

Layer System ◽

Gravity Driven ◽

The Stability ◽

Long Wave Approximation

We study the effect of anisotropy and inhomogeneity in the permeability of the porous layer on the stability of surface waves of an inclined fluid–porous double-layer system. The fluid is assumed to be Newtonian and the porous layer to be Darcian. The porous layer is saturated with the same fluid and the two layers are coupled at the interface via the Beavers–Joseph condition. Linear stability analysis is performed based on a long-wave approximation. The resulting eigenvalue problem is exactly solved up to third order in the wavenumber. The anisotropic behaviour of permeability, cross-stream component of permeability, surface tension and porosity are found to have only higher-order effects on the stability characteristics of the system. On the other hand, the inhomogeneous feature in the streamwise component of permeability play a dominant role in determining the stability of the gravity-driven surface waves; as do other system parameters such as the thickness of the fluid layer relative to that of the porous layer and the Beavers–Joseph coefficient.

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Pulsed discharges produced by surface waves

Journal de Physique IV (Proceedings) ◽

10.1051/jp4:1998727 ◽

1998 ◽

Vol 08 (PR7) ◽

pp. Pr7-317-Pr7-326 ◽

Cited By ~ 3

Author(s):

O. A. Ivanov ◽

A. M. Gorbachev ◽

V. A. Koldanov ◽

A. L. Kolisko ◽

A. L. Vikharev

Keyword(s):

Surface Waves ◽

Pulsed Discharges

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Discrete element method to model cracking for two layer systems

TAPPI Journal ◽

10.32964/tj18.2.101 ◽

2019 ◽

Vol 18 (2) ◽

pp. 101-108

Author(s):

Daniel Varney ◽

Douglas Bousfield

Keyword(s):

Discrete Element Method ◽

Flexural Modulus ◽

Single Layer ◽

Discrete Element ◽

Flexural Stress ◽

Layer System ◽

Three Point Bending ◽

Moving Force ◽

Coating Layers ◽

Element Method

Cracking at the fold is a serious issue for many grades of coated paper and coated board. Some recent work has suggested methods to minimize this problem by using two or more coating layers of different properties. A discrete element method (DEM) has been used to model deformation events for single layer coating systems such as in-plain and out-of-plain tension, three-point bending, and a novel moving force picking simulation, but nothing has been reported related to multiple coating layers. In this paper, a DEM model has been expanded to predict the three-point bending response of a two-layer system. The main factors evaluated include the use of different binder systems in each layer and the ratio of the bottom and top layer weights. As in the past, the properties of the binder and the binder concentration are input parameters. The model can predict crack formation that is a function of these two sets of factors. In addition, the model can predict the flexural modulus, the maximum flexural stress, and the strain-at-failure. The predictions are qualitatively compared with experimental results reported in the literature.

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