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Search Publications by: Nicos Martys (Assoc)

Displaying 101 - 125 of 184

Study of a Dissipative Particle Dynamics Based Approach for Modeling Suspensions

April 1, 2005

Author(s)

Nicos Martys

In this paper, a dissipative particle dynamics (DPD)-based approach for modeling suspensions is examined. A series of tests are applied comparing simulation results to well established theoretical predictions. The model recovers the dilute limit intrinsic

Breakup of a Fluid Thread in a Confined Geometry: Droplet-Plug Transition Perturbation Sensitivity and Kinetic Stabilization With Confinement .

December 1, 2004

Author(s)

J G. Hagedorn, Nicos Martys, J F. Douglas

La Rheologie des Materiaux Cimentaires. [The Rheology of Cementitious Materials].

December 1, 2004

Author(s)

Robert J. Flatt, Nicos Martys, L Bergstrom

Rheology of Cementitious Materials.

December 1, 2004

Author(s)

Robert J. Flatt, Nicos Martys, L Bergstrom

Simulation of Sheared Suspensions With a Parallel Implementation of QDPD.

December 1, 2004

Author(s)

J S. Sims, Nicos Martys

Virtual Permeametry on Microtomographic Images.

December 1, 2004

Author(s)

C H. Arns, M A. Knackstedt, W V. Pinczewski, Nicos Martys

Virtual Permeametry on Microtomographic Images

November 1, 2004

Author(s)

C H. Arns, M A. Knackstedt, W V. Pinczewski, Nicos Martys

We show that accurate numerical micropermeametry measurements can be performed on three dimensional digitized images of sedimentary rock. The sample size can be very small making it possible to predict properties from core material not suited for

Breakup of a Fluid Thread in a Confined Geometry: Droplet-Plug Transition Perturbation Sensitivity and Kinetic Stabilization with Confinement

May 26, 2004

Author(s)

John G. Hagedorn, Nicos Martys, Jack F. Douglas

The breakup of a fluid thread surrounded by another Newtonian fluid in a coaxial tube in the absence of imposed flow is investigated using the Lattice Boltzmann (LB) model. We observe a confinement-induced transition between spherical droplets to plugs in

Breakup of a Fluid Thread in a Confined Geometry: Droplet-Plug Transition Perturbation Sensitivity and Kinetic Stabilization With Confinement .

May 1, 2004

Author(s)

John G. Hagedorn, Nicos Martys, J. F. Douglas

We investigate the influence of geometrical confinement on the breakup of long fluid threads in the absence of imposed flow using a lattice Boltzmann model. Our simulations primarily focus on the case of threads centered coaxially in a tube filled with

The Rheology of Cementitious Materials: Chemistry, Colloids and Rocks

May 1, 2004

Author(s)

Robert J. Flatt, Nicos Martys

Knowledge of colloidal science has proven essential in the development of a new generation of dispersants for concrete. These polymer molecules induce steric repulsion between cement particles, reducing agglomeration and allow high workability to be

Simulation of Sheared Suspensions With a Parallel Implementation of Quaternion-Based Dissipative Particle Dynamics (QDPD)

April 1, 2004

Author(s)

James S. Sims, Nicos Martys

A quaternion-based dissipative particle dynamics (QDPD) program was developed to study the flow properties of complex fluids like suspensions, subject to shear. To overcome CPU speeds limiting the size and complexity of the simulations that can be carried

Breakup of a Fluid Thread in a Confined Geometry: Droplet-Plug Transition, Perturbation Sensitivity and Kinetic Stabilization with Confinement

January 1, 2004

Author(s)

John G. Hagedorn, Nicos Martys, Jack F. Douglas

Suppression of Capillary Instability of a Polymeric Thread Via Parallel Plate Confinement

July 1, 2003

Author(s)

Y Son, Nicos Martys, John G. Hagedorn, Kalman D. Migler

We investigate the stability of a polymer thread imbedded in a matrix that is confined between two parallel plates. Utilizing a combination of experiments, numerical simulations (Lattice-Boltzmann) and surface area calculations we find substantial