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 abrangem 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.

Modeling Horizontal Ground Heat Exchangers in Geothermal Heat Pump Systems

A. Chiasson
University of Dayton, Dayton, OH, USA

Geothermal heat pumps use the earth as a heat source and sink via a ground heat exchanger (GHX) that consists of a network of buried heat exchange pipes, which can either be installed in vertical boreholes or in shallow horizontal trenches or excavations. The main goal in GHX design is to determine the minimum length of pipe needed to provide adequate fluid temperatures to heat pumps over their ...

Modeling of a Helical Coil Heat Exchanger for Sodium Alanate Based on-board Hydrogen Storage System

S. Kumar[1], and M. Raju[2]
[1]General Motors R&D Center, Warren, MI, USA
[2]Optimal CAE Inc., Detroit, MI, USA

Hydrogen refueling in a metal hydride based automotive hydrogen storage system is an exothermic reaction and hence an efficient heat exchanger is required to remove the heat for fast refueling. In this paper a helical coil heat exchanger embedded in a sodium alanate bed is modeled using COMSOL. Sodium alanate is present in the shell and the coolant flows through the helical tube. A three ...

Dimensionless versus Dimensional Analysis in CFD and Heat Transfer

H. Dillon[1], A.F. Emery[1], A. Mescher[1], and R.J. Cochran[2]
[1]University of Washington, Seattle, WA, USA
[2]Applied CHT, Seattle, WA, USA

Students in engineering and science are often exposed early in their studies to non dimensional analysis. When it comes to solving fluid flow/heat transfer problems, many solutions, particularly industrial ones, are based on finite element/finite volume using dimensioned quantities. In order to compare to reference information one would like to use codes like COMSOL Multiphysics to solve non ...

Modeling of Ferrofluid Passive Cooling System

M. Yang[1,2], R. O'Handley[2], and Z. Fang[2,3]
[1]Massachusetts Institute of Technology, Cambridge, MA, USA
[2]Ferro Solutions, Woburn, MA, USA
[3]Pennsylvania State University, University Park, PA, USA

A ferrofluid contains nanoscale ferromagnetic particles suspended in a carrier liquid. It is used in some high-power acoustic speakers to cool the drive coil. The ferromagnetic particles far from the heat source are attracted by the drive coil’s magnetic field. As the fluid approaches the heat source, its temperature rises, causing the nanoparticles to become paramagnetic. Cooler magnetic fluid ...

Uncertainty Analysis, Verification and Validation of a Stress Concentration in a Cantilever Beam

S. Kargar, and D. Bardot
University of Alabama, Huntsville, AL, USA

In this paper we compare the results from a bending cantilever beam experiment with the theoretical values and COMSOL finite element simulation results. In the experiment a simple cantilever beam with a hole is loaded at the end. Measurements are recorded by four strain gauges mounted on the beam, three near the hole and one at a location where the nominal stress is equivalent to that of a ...

Analysis of Acoustic Response of Rooms

J.S. Crompton[1], L.T. Gritter[1], S. Yushanov[1], K.C. Koppenhoefer[1], and D. Magyari[2]
[1]AltaSim Technologies, LLC, Columbus, OH, USA
[2]Golden Acoustics, Detroit, MI, USA

The preferred acoustic response of recording studios, auditoriums and conference halls is to have an even energy response over the entire room and throughout full audio spectrum. This can be accomplished by using acoustic panels with complex surface structures that scatter acoustic waves and diffuse sound level variability over the room volume or through the use of sound absorbing materials to ...

Effective Medium Theory of Nanodielectrics for Embedded Energy Storage Capacitors

R. Bikky, N. Badi, and A. Bensaoula
University of Houston, Houston, TX, USA

In this work, we present the effective properties of nanodielectrics with gold (Au) nanoparticles embedded in polymer (Polyvinyl Pyrrolidone (PVP)) matrix, calculated by using finite element method (FEM) based simulation in COMSOL Multiphysics software. Drude model is used to calculate size dependent complex dielectric function of Au. EMTs of Maxwell-Garnett, Bruggeman and Looyenga models are ...

Simulations of Meniscus Motion and Evaporation for Convective Deposition Manufacturing

J. Xiao, and D. Attinger
Columbia University, New York, NY, USA

Convective deposition is a material processing technique where an evaporating meniscus of a colloidal suspension is dragged along a solid substrate to deposit layers of micro or nanoparticles. The process is a typical multiphysics process where fluid dynamics, mass and heat transfer come into play in a small deforming domain. In this work, we describe an Arbitrary Lagrangian-Euler model ...

Failure Stress Analysis of Fiber Reinforced of Composite Laminates under Uniaxial/Biaxial Loading

Z. Hasan[1], F. Darwish[2], and S. Al-Absi[2]
[1]Texas A&M University, College Station, TX, USA
[2]Jordan University of Science and Technology, Irbid, Jordan

The main objective of the present work is to perform stress analysis on composite laminates under unaxial/biaxial loading to serve as a preliminary data for test verification. A detailed calculation based on the Classical Lamination Theory was performed for a laminate. The material used was carbon/epoxy applying a pure uniaxial load followed by a biaxial load. It was observed that the failure ...

A Directional Dogbone Flextensional Sonar Transducer

S.C. Butler
Naval Undersea Warfare Center, Newport, RI, USA

In order to transmit energy in one direction, sonar flextensional transducers are combined into arrays of elements that are spaced a 1/4 wavelength apart. The directionality (front-to-back pressure ratio) is a modest of 6 dB. A single projector that is 1/3 wavelength in size and capable of developing unidirectional beams with front-to-back ratios greater than 20 dB that is independent of sound ...