Agnieszka Truszkowska

Oregon State University | OSU · School of Mechanical, Industrial and Manufacturing Engineering

Plastic deformation proceeds through a sequence of stochastic local slip followed by load redistribution. With continued deformation this builds up complex stress fields and develops a heterogeneous pat- tern of local strength, leading to the emergence of microvoids and cracks. The goal of this research is to develop a coarse grained model for crys...

A method for modeling cubically anisotropic elasticity within the discrete element method is presented. The discrete element method (DEM) is an approach originally intended for modeling granular materials (sand, soil, and powders); however, recent developments have usefully extended it to model stochastic mechanical processes in monolithic solids w...

We present a method for solving the Boltzmann transport equation (BTE) for phonons by modifying the neutron transport code Rattlesnake which provides a numerically efficient method for solving the BTE in its self-adjoint angular flux (SAAF) form. Using this approach, we have computed the reduction in thermal conductivity of uranium dioxide (UO2) du...

Failure of metallic materials due to plastic and/or creep deformation occur by the emergence of necking, microvoids, and cracks at heterogeneities in the material microstructure. While many traditional deformation modeling approaches have difficulty capturing these emergent phenomena, the discrete element method (DEM) has proven effective for the s...

Recent advances for fabricating micro-featured architectures such as posts or pillars in fluidic devices provide exciting opportunities for multiphase ow management. Here we describe a novel, multiscale modeling approach for two-phase flows in microfeatured architectures developed within the Shan and Chen Lattice Boltzmann method. In our approach a...

Microchannel-based hemodialysis has a potential to improve survival rates and quality of life for end-stage renal disease patients compared to conventional hemodialysis technology. Characterization of hydrodynamic behavior in microchannel geometries is necessary for improving flow uniformity, a critical challenge in realizing a commercial device. A...

Obstruction of fluid flow by stationary bubbles in a microchannel hemodialyzer decreases filtration performance and increases damage to blood cells through flow maldistribution. A polyethylene oxide (PEO)-polybutadiene (PB)-polyethylene oxide surface modification, previously shown to reduce protein fouling and water/air contact angle in polycarbona...

Lattice Boltzmann Method based multiscale modeling of two-phase flows through microarchitectures with microfeatures Agnieszka Truszkowska1 and Goran Jovanovic1 1Oregon State University, Department of Chemical, Biological, and Environmental Engineering, Corvallis, OR 97330, USA Emails: truszkoa@onid.orst.edu, goran.jovanovic@oregonstate.edu...

Current hemodialysis techniques rely on hollow-fiber tubes in a tube-and-shell operating approach. The method works satisfactorily; but, technological advantages of this method are already exhausted for a long time. Additional improvements are needed which could provide a way towards improving patient health and quality of life. Patients with renal...

Adsorption Based Hydrogen Storage System; Multiscale Approach and Mathematical Model Agnieszka Truszkowska1, Christopher Loeb1 and Goran Jovanovic1 1Oregon State University, Department of Chemical, Biological, and Environmental Engineering, Corvallis, OR 97330, USA Emails: truszkoa@onid.orst.edu, loebc@onid.orst.edu, goran.jovanovic@oregonstat...

Temperature distribution in activated carbon bed during adsorption of nitrogen (model gas for hydrogen); experiment & mathematical model Agnieszka Truszkowska1, Christopher Loeb1, Richard Chahine2, Bruce Hardy3 and Goran N. Jovanovic1 1Oregon State University, Department of Chemical, Biological, and Environmental Engineering, Corvallis, OR 97...

High volumetric storage density of hydrogen gas is a major challenge in the progress towards hydrogen-fueled automobiles. Of the various storage methods, pressurized gas tanks, liquid hydrogen storage, liquid chemical systems, and solid-state storage, activated carbon adsorbents show great potential. A reliable thermal management system within the...