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Evaluation of Tensile Modulus of Carbon Nanotube Bundle Based Composite with Interface Using Finite Element Method

M. S. Islam, F. O. Riktan, S. C. Chowdhury, M. M. R. Chowdhury, and S. Ahmed
Bangladesh University of Engineering & Technology (BUET)
Dhaka, Bangladesh

Carbon Nanotubes (CNTs) have remarkable mechanical, thermal and electrical properties. The properties of CNTs depend on atomic arrangement (how the sheets of graphite are rolled), the diameter and length of the tubes and morphology of nanostructure. In this paper effective elastic properties of CNT based polymer composites are evaluated using a square Representative Volume Element (RVE) in ...

VLSI Layout Based Design Optimization of a Piezoresistive MEMS Pressure Sensors using COMSOL Multiphysics

R. Komaragiri[1], Sarath. S.[1], N. Kattabomman[1]
[1]NIT Calicut, Kozhikode, Kerala

This paper focuses on the diaphragm design and optimization of a piezoresistive Micro Electro Mechanical System (MEMS) pressure sensor by considering Very Large Scale Integration (VLSI) layout schemes. The aim of these studies is to find an optimal diaphragm shape by Finite Element Method (FEM) using COMSOL®, which is most suitable for VLSI layout. Optimal diaphragm shape is a diaphragm shape ...

Near-Wall Dynamics of Microbubbles in an Acoustical Trap - new

L. Wright[1], G. Memoli[1], P. Jones[2], E. Stride[3]
[1]National Physical Laboratory, Teddington, UK
[2]University College London, London, UK
[3]University of Oxford, Oxford, UK

Understanding the interactions between microbubbles and surfaces is key to the successful deployment of microbubbles in a range of applications. Two important examples are their use as a drug delivery mechanism, and their potential use of acoustically-driven bubbles as microscale sensors. Drug delivery with bubbles involves sonication at high frequency close to a boundary, and sensing with ...

Wireless RF Digital System for Mouth-Embedded Multi-Sensor Communication

I.M. Abdel-Motaleb[1], J. Lavrencik [1]
[1]Department of Electrical Engineering, Northern Illinois University, DeKalb, IL, USA

There is urgent need to monitor dental and oral diseases, such as tooth decay, gum diseases, and teeth grinding. Such monitoring can be achieved by embedding sensors in the mouth. This technique faces some difficulties. The first is how the power needed for the operation of the sensors and the associated electronic chips can be generated. This power can be generated using the pressure exerted by ...

Simulations of Micropumps Based on Tilted Flexible Structures - new

M. J. Hancock[1], N. H. Elabbasi[1], M. C. Demirel[2]
[1]Veryst Engineering, LLC., Needham, MA, USA
[2]Pennsylvania State University, University Park, PA, USA

Pumping liquids at small scales is challenging because of the principle of reversibility: in a viscous regime, the flow streamlines through a fixed geometry are the same regardless of flow direction. Recently we developed a class of microfluidic pump designs based on tilted flexible structures that combines the concepts of cilia (flexible elastic elements) and rectifiers (e.g., Tesla pump). We ...

Design and Development of Microsystems within a Corporate Research Environment by Utilizing Comsol Multiphysics

A. Frey
Siemens AG
Corporate Research & Technologies
Munich, Germany

Alexander Frey received his M.A. degree from the University of Texas, Austin, in 1994, the Dipl. Phys. degree from the University of Wuerzburg, Germany in 1997 and the PhD from the Saarland University, Germany in 2010. In 1997 he joined Research Laboratories of Siemens working on the design of DRAM sensing circuits. In 1999 he joined Corporate Research, Infineon, Munich, Germany. He was engaged ...

Designing Piezoelectric Interdigitated Microactuators using COMSOL

O. Myers [1], M. Anjanappa [2], and C. Freidhoff [3]

[1] Mississippi State University, Mississippi State, MS, USA
[2] University of Maryland Baltimore County, Baltimore, MD, USA
[3] Northrop Grumman Corporation, Electronics Systems Sector, Baltimore, MD, USA

This paper presents a methodology towards designing, analyzing and optimizing piezoelectric interdigitated microactuators using COMSOL Multiphysics. The models used in this study were based on a circularly interdigitated design that takes advantage of primarily the d33 electromechanical piezoelectric constant coefficient. Because of the symmetric nature of the devices, 2D axisymmetric models ...

Particle Flow Control by Magnetically Induced Dynamics of Particle Interactions

F. Wittbracht[1], A. Weddemann[1], A. Auge[1], and A. Hütten[1]

[1]Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, Bielefeld, Germany

In this work, we show that dipolar magnetic coupling can be used to control the particle flow through microfluidic structures without changing the state of motion of the carrier liquid. Also no external magnetic gradient fields are employed; the total external magnetic force applied is therefore zero. The theoretical idea will be tested experimentally. Here, additional effects originating from ...

Numerical Investigation of Electroosmotic Flow in Convergent Divergent Micronozzle

V. Gnanaraj[1], V. Mohan[1], and B. Vellaikannan[1]
[1]Thiagarajar College of Engineering, Madurai, Tamilnadu, India

A fundamental understanding of the transport phenomena in microfluidic channels is critical for systematic design and precise control of such miniaturized devices towards the integration and automation of Lab-on- a-chip devices. Electroosmotic flow is widely used to transport and mix fluids in microfluidic systems. Electroosmotic transport in convergent divergent micronozzle is significant in ...

Chemical Reaction Engineering: Difusão com Biotransformação

D. R. M. Vieira [1], S. A. Cardoso [1], A. S. Santos [1],
[1] Universidade Federal do Pará, Pará, Brasil

A biotransformação de substratos utilizando enzimas imobilizadas em nanopartículas presentes num meio fluido (substrato), contido num bioreator CSTR, foi investigada. O software COMSOL Multiphysics foi usado para simular o sistema através do uso das equações de difusão de espécies apropriadas para o consumo do substrato. Nessa investigação, a difusão na superfície da nanopartícula, onde ocorre a ...