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Retention phenomena in non-Newtonian fluids flow

D'Angelo, M.V; Fontana, E; Chertcoff, R; Rosen, M - In: Physica A: Statistical Mechanics and its Applications 327 (2003) 1, pp. 44-48

The dispersion phenomenon of a polymer solution (scleroglucane) in a porous medium has been studied using radioactive …

Persistent link: https://www.econbiz.de/10010591715

Spreading of non-Newtonian fluids and surfactant solutions on solid surfaces

Rafaı¨, Salima; Bonn, Daniel - In: Physica A: Statistical Mechanics and its Applications 358 (2005) 1, pp. 58-67

The spreading of Newtonian fluids onto smooth solid substrates is well known; the speed of the contact line is given by a competition between capillary driving forces and viscous dissipation, yielding Tanner's law R∝t1/10. Here, we study the spreading of droplets of complex fluids having...

Persistent link: https://www.econbiz.de/10011059041

Stable–unstable crossover in non-Newtonian radial Hele–Shaw flow

Obernauer, S; Drazer, G; Rosen, M - In: Physica A: Statistical Mechanics and its Applications 283 (2000) 1, pp. 187-192

The miscible displacement of a non-Newtonian, shear thinning aqueous polymeric solution, by a Newtonian fluid in a radial Hele–Shaw cell is studied. Experiments where the Newtonian fluid viscosity is tuned to lie between high and low shear rate asymptotic apparent viscosities of the polymeric...

Persistent link: https://www.econbiz.de/10010591128

Fragment distributions for brittle rods with patterned breaking probabilities

Higley, Michael; Belmonte, Andrew - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 28, pp. 6897-6912

We present a modeling framework for 1D fragmentation in brittle rods, in which the distribution of fragments is written explicitly in terms of the probability of breaks along the length of the rod. This work is motivated by the experimental observation of several preferred lengths in the...

Persistent link: https://www.econbiz.de/10010872280

The effect of quenched disorder on the fractal dimension of crack for brittle fracture in two dimensions

Wang, S.G. - In: Physica A: Statistical Mechanics and its Applications 335 (2004) 1, pp. 1-8

simulation with Gauss–Seidel iteration for brittle fracture Mode I. The material-dependent parameter, G0/G, is introduced in this …. Brittle fracture of the same material with different quenched disorders is simulated. Fractal dimension of crack fluctuates … with quenched disorder. It seems that it is impossible to have a universal fractal dimension of crack in brittle fracture …

Persistent link: https://www.econbiz.de/10010872981

Gels under strong deformation

Sekimoto, Ken - In: Physica A: Statistical Mechanics and its Applications 249 (1998) 1, pp. 262-265

Polymer gel serves as a model system which represents many aspects of static and dynamic processes in solids in an amplified manner both spatially and temporaly. We will give a brief overview of those aspects and refer to the recent topics on the subjects.

Persistent link: https://www.econbiz.de/10010874099

Geometrical minimum units of fracture patterns in two-dimensional space: Lattice and discrete Walsh functions

Nishiyama, Yuta; Nanjo, Kazuyoshi Z.; Yamasaki, Kazuhito - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 25, pp. 6252-6262

We present the geometrical minimum units of fracture patterns in two-dimensional space. For this analysis, a new method … discrete Walsh functions that have been used to measure symmetropy (an object related to symmetry and entropy) of fracture … patterns. We concluded that the minimum units of fracture patterns can be expressed as three kinds of lattice. Our model is …

Persistent link: https://www.econbiz.de/10010874247

A model of trabecular bone and an application to osteoporosis

Gunaratne, Gemunu H; Mohanty, Kishore K; Wimalawansa, … - In: Physica A: Statistical Mechanics and its Applications 315 (2002) 1, pp. 98-104

Large bones consists of an outer compact shaft and an inner porous segment, known as the trabecular architecture (TA). The TA is the principal load carrier in bones from older adults, and the aim of therapeutic interventions is to preserve their strength. It is argued that forms for broad-based...

Persistent link: https://www.econbiz.de/10010874380

Natural time analysis of critical phenomena: The case of acoustic emissions in triaxially deformed Etna basalt

Vallianatos, Filippos; Michas, George; Benson, Phil; … - In: Physica A: Statistical Mechanics and its Applications 392 (2013) 20, pp. 5172-5178

Acoustic emissions exhibit complex correlations between space, time, and magnitude. As such, they present a unique example for a complex time series. We apply the recently introduced method of natural time analysis, which enables the detection of long-range temporal correlations even in the...

Persistent link: https://www.econbiz.de/10010874775

Criticality in models for fracture in disordered media

Caldarelli, G.; Castellano, C.; Petri, A. - In: Physica A: Statistical Mechanics and its Applications 270 (1999) 1, pp. 15-20

It has been recently noticed that heterogeneous media undergoing a fracturing process display a set of properties characteristic of systems at the critical state. In the present work we focus on the way in which the critical regime is reached. It is possible to define a branching ratio, for the...

Persistent link: https://www.econbiz.de/10011057423