Artigos Técnicos e Apresentações

Aqui você encontrará apresentações realizadas nas Conferências de Usuários COMSOL de todo o mundo. As apresentações englobam pesquisas e produtos inovadores feitas por engenheiros e cientistas usando o COMSOL Multiphysics. Os tópicos abramgem uma grande gama de indústrias e aplicações, como elétrica, mecânica, escoamento e química. Use a função de busca "Quick Search" para encontrar apresentações na sua área de interesse.

Gating of Gigantic Ionic Current through Single-Walled Carbon Nanotubes

P. Krstic, and J. Park
Oak Ridge National Laboratory
Oak Ridge, TN

The gigantic magnitude features of the ionic current of electrolyte through carbon nanotubes (CNT) are explained by the dramatic increase of electroosmotic current induced by the strong slip at the CNT surface and the considerable excess volume charge inside the tube. In this study, we investigate the fundamental details of gating phenomena of such gigantic ionic current through CNT by using ...

Structural and Geomechanics Modeling of a Railroad Bridge

H. Diaz-Alvarez, R. Costley, D. Whitlow, M. McKenna, C. Williamson, and O. Taylor
US Army Engineer & Development Center
Vicksburg, MS

Previous studies have determined that bridges radiate acoustic energy in the infrasonic frequency range. Initial interest in this topic was the result of trying to identify sources of infrasound recorded at stations deployed near bridges. A Finite Element model has been developed for a Pratt truss railroad bridge located at Ft. Leonard Wood, MO. The model consists of 3-D Euler beam elements ...

Optimization of the Design Parameters of a Piezoelectric Actuator

G. Srivastava[1], R. Sharma[1], A. Goswami[2], A. Phani[2], and R. K. Dwivedi[1]
[1]Jaypee Institute of Information Technology, India
[2]Indian Institute of Science, India

In this work a cantilever beam has been chosen as the element of study, consisting of a piezoelectric polymer like PVDF with a thin permalloy layer coating on one side of it. This piezoelectric cantilever is designed using COMSOL software. It is seen that the deflection of the tip of a unimorph cantilever is dependent on its geometric dimension, type of material and the applied field. Hence in ...

Modeling of Dehydration of Mushroom Using Finite Element Method

C. Anandharamakrishnan[1], A. Choudhary[2], and R. Gopirajah [1]
[1]Human Resource Development,CSIR-Central Food Technological Research Institute, Mysore, India
[2]Manipal Institute of Technology, Manipal, Karnataka, India

Dehydration is one of the methods that would extend the shelf life of mushrooms. Dried mushrooms can be used in many different types of products. Furthermore, elevated temperatures during drying enhance enzymatic reactions that can result in improved flavor of dehydrated mushrooms. This study aims to model the dehydration of mushroom using finite element modeling (FEM) taking into account of ...

Design of a RF MEMS Switch

B. Mishra, M. P. S. Naidu, J. Raj, and Z. C. Alex
VIT University
Vellore
Tamilnadu, India

This paper presents a novel design of a RF MEMS Switch. The switch is a capacitive type, which is actuated by an electrostatic force. The structure of the switch consists of a CPW (coplanar waveguides) transmission lines and a suspended membrane. The modelling of switch is done using COMSOL software and RF characteristics is found out by using CST software.

Design and Simulation of a Valveless Polymeric Micropump for Drug Delivery Applications

S. Babu[1], and P. Manohar[2]
[1]Department of Electrical and Electronics Engineering, M S Ramaiah Institute of Technology, Bengaluru, Karnataka, India
[2]Department of Medical Electronics, M S Ramaiah Institute of Technology, Bengaluru, Karnataka, India

Valveless micropumps have the advantage of being composed of least number of movable parts and hence can be used for long-term drug delivery applications. Their working principle is based on reciprocal forcing of fluid by an actuator through diffuser/nozzle elements generating a rectified mean flow. Micropumps based on different actuating mechanisms have already been designed and fabricated ...

Modeling and Simulation of Circular and Square Diaphragm Absolute Micro Pressure Sensors using COMSOL

M. Sundaram[1], A. Simha[2], S M. Kulkarni[3], and S. Bhat[4]
[1]Department of ICE, Manipal Institute of Technology, Manipal, India
[2]Department of Mechatronics, National Institute of Technology, Suratkal, India
[3]Department of Mechanical, National Institute of Technology, Suratkal, India
[4]Department of E&C, Manipal Institute of Technology, Manipal, India

The aim of this paper is to model and simulate a Circular and Square diaphragm absolute micro pressure sensors. With the applied pressure, the change in deflection and stress pattern of the diaphragm is analytically determined. The structures are then simulated using COMSOL Multiphysics®. The results obtained from analytical equations are compared with simulated results. The range and ...

Fluid Dynamics of Blood Flow During Reperfusion and Post-conditioning

T. Merrill, and A. La Barck
Rowan University, Glassboro, NJ, USA

Reperfusion injury is caused by the rapid restoration of blood flow to oxygen-starved tissue. The model will simulate pulsatile blood flow. A separate 2-dimensional axisymmetric straight tube model will be constructed to simulate the pulsating angioplasty balloon within the flow path. Outlet flow profiles from the straight tube model will then be used as the inlet condition for the ...

Design Optimization of Slotted Waveguide Antenna Stiffened Structures (SWASS)

T. Ha, and R.A. Canfield
Virginia Polytechnic Institute and State University, Blacksburg, VA, US

Design optimization of slotted waveguide antenna stiffened structures (SWASS) is described. SWASS is a multidisciplinary blending of RF slotted waveguide technology and stiffened composite structures technology. Structural analysis and radio frequency (RF) analysis are integrated. A hat-type stiffened panel is modeled to meet the structure and RF requirements. We are motivated by the potential of ...

Using COMSOL with the Adjoint Method for Inverse Problems

A. Emery
University of Washington, Seattle, WA, USA

The standard way of estimating parameters in solving inverse problems is based upon least squares fitting which minimizes the sum of the residuals. Another way of minimizing is based upon the adjoint approach in which the sum of the residuals is augmented by the constraint that the solution satisfies the appropriate algebraic or differential equations. This method involves solving the adjoint ...

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