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Single Phase Flow Models in Fractal Porous Media Using a Fractal Continuum Mechanics Approach

E. Linares-Pérez [1], M. Díaz-Viera [1, 2],
[1] Instituto de Geofísica, Universidad Nacional Autónoma de México, Coyoacán, DF, México
[2] Instituto Mexicano del Petróleo, Ciudad de México, DF, México

The primary motivation of this work was to develop flow models in porous media with fractal properties to represent the anomalous behavior observed in some pressure tests in naturally fractured reservoirs. Mehr lesen

Particle Concentration Effect On Dielectrophoretic Trapping

M. A. Saucedo-Espinosa [1], B. H. Lapizco-Encinas [2],
[1] Department of Microsystems Engineering, Rochester Institute of Technology, Rochester, NY, USA
[2] Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, USA

Dielectrophoresis (DEP) is an electric field driven technique that has important applications in the enrichment, concentration and isolation of biological and non-biological particles. The assessment of particle trapping capacity using DEP, however, has been qualitative in nature; since ... Mehr lesen

Optimization of Insulator-Based Dielectrophoretic Devices

M. A. Saucedo-Espinosa [1], M. Rauch [1], B. H. Lapizco-Encinas [2],
[1] Department of Microsystems Engineering, Rochester Institute of Technology, Rochester, NY, USA
[2] Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, USA

Insulator-based dielectrophoresis (iDEP) employs arrays of electrically insulator posts in a microfluidic device to create dielectrophoretic forces that affect particle movement (Figure 1). The trapping performance of iDEP devices involves a careful balance between electrokinetics (EK) ... Mehr lesen

Design and Simulation of a Piezoelectric Actuated Valveless Micropump

J. J. Rojas [1], J. E. Morales [2],
[1] School of Electromechanical Engineering, Instituto Tecnológico de Costa Rica, Cartago, Costa Rica
[2] School of Electronic Engineering, Instituto Tecnológico de Costa Rica, Cartago, Costa Rica

Microfluidics is a multidisciplinary field, basically it designs systems to handle small volumes of fluids. Most applications require a pumping action in order to move the fluid trough the system. For most of them a micro scale active pump is highly desirable. A piezoelectric micropump ... Mehr lesen

A Comparison of Discrete Fracture Models for Single Phase Flow in Porous Media Using COMSOL Multiphysics® Software

C. A. Romano-Pérez [1], M. A. Díaz-Viera [2],
[1] Facultad de Ingeniería, Universidad Nacional Autónoma de México, Coyoacán, DF, México
[2] Ingeniería de Recuperación Adicional, Instituto Mexicano del Petróleo, Gustavo A. Madero, DF, México

A comparison of discrete fracture and explicit fracture models for single-phase flow in fractured porous media using COMSOL Multiphysics® software is presented to understand the contribution of each individual fracture to fluid flow, and the exchange between fracture and surrounding ... Mehr lesen

COMSOL Multiphysics® Simulation of Flow in a Radial Flow Fixed Bed Reactor (RFBR)

A. G. Dixon [1], D. S. Polcari [1], A. D. Stolo [1], M. Tomida [1],
[1] Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA

For design of radial flow fixed bed reactors, it is important to ensure proper flow distribution through the catalyst bed. A 2D axisymmetric model of a radial-flow reactor was used to evaluate flow maldistribution through the catalyst bed and the pressure drop through the reactor for a ... Mehr lesen

Electromagnetic Modeling of Induction Tool Responses in Layered Earth Formations

N. Shakya [1], L. Sun [1],
[1] Youngstown State University, Youngstown, OH, USA

Introduction: This study presents the 3D electromagnetic model in layered media using induction logging tool. This algorithm utilizes electromagnetic wave frequency domain (EWFD) interface of Maxwell equations. Electromagnetic methods are popular tools for the measurement of resistivity ... Mehr lesen

Design of a Dielectrophoretic Based Micropipette for Gene Expression Applications Using COMSOL Multiphysics® Software

D. Wijesinghe [1], K. Nawarathna [1],
[1] Department of Electrical and Computer Engineering, North Dakota State University, Fargo, ND, USA

We have used COMSOL Multiphysics® software to design a micropipette for single -cell gene expression profiling. The micropipette design allows us to insert it into a single-cell to extract genes through dielectrophoresis. As dielectriphoretic force depends on the applied electric field ... Mehr lesen

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