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Air-Water-Foam Mix Chamber for Fire Protection of Fossil Fuel Containers: Modeling and Optimization

S. Hidrobo [1], A. X. Jerves [1], A. Landazuri [1], S. D. Ballen [1],
[1] Universidad San Francisco de Quito, Quito, Ecuador

Since the industrial demand in the energetic, mining and oil & gas sectors has increased exponentially these last decades, security standards and fire protection methods are extremely important not only for the employees, but also for the infrastructure involved in production areas and processes. Throughout the fire protection circuits on site where fossil fuels are stored and manipulated, the ...

Design for Reliability and Robustness through Probabilistic Methods in COMSOL Multiphysics with OptiY

T.-Q. Pham[1], H. Neubert[2], and A. Kamusella[2]
[1]OptiY e.K., Aschaffenburg, Germany
[2]Institute of Electro-Mechanical and Electronic Design, TU Dresden, Germany

One challenge in designing micro-electromechanical systems (MEMS) is considering the variability of design parameters caused by manufacturing tolerances and material properties. The function of MEMSs is significantly influenced by this variability, which can be represented in terms of statistical variables. In order to involve statistical design parameters into the design optimization process, ...

Design and Optimization of an All Optically Driven Phase Correction MEMS Deformable Mirror Device using Finite Element Analysis

V. Mathur[1], K. Anglin[1], V.S. Prasher[1], K. Termkoa[1], S.R. Vangala[1], X. Qian[1], J. Sherwood[1], W.D. Goodhue[1], B. Haji-Saeed[2], and J. Khoury[2]

[1]Photonics Center, University of Massachusetts-Lowell, Lowell, Massachusetts, USA
[2]Air Force Research Laboratory/Sensors Directorate, Hanscom Air Force Base, Massachusetts, USA

Optically addressable MEMS mirrors are required for future high density adaptive optics array systems. We have demonstrated a novel technique of achieving this by actuating low stress Silicon Nitride micro mirrors via cascaded wafer bonded Gallium Arsenide photo detectors on Gallium Phosphide. In the work reported here, we discuss the key design parameters of the device, and present the finite ...

Parallel Performance Studies for COMSOL Multiphysics Using Scripting and Batch Processing

N. Petra[1], and M.K. Gobbert[1]

[1]Department of Mathematics and Statistics, University of Maryland, Baltimore County, Baltimore, Maryland, USA

The graphical user interface (GUI) of COMSOL Multiphysics offers an effective environment to get started solving problems. For reproducibility of the results, it is often desirable to explore the script-based modeling capabilities of COMSOL with MATLAB. There are also potential benefits of running COMSOL in parallel, specifically by running several computational threads in shared-memory ...

Coupled Heat and Mass Transfer Processes in Enclosed Environments

J.L.Wilson[1], and R. Dwivedi[1]

[1]New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA

Geothermally driven natural convection in enclosures is a ubiquitous process occurring in many physical environments such as caves, mines, etc. We have numerically simulated laminar and turbulent natural convection in isolated air-filled cavities, buried in a more conductive rock mass. We have modeled heat transfer using COMSOL's Convection and Conduction mode. To better understand the ...

Simulating the Influence of the Nozzle Diameter on the Shape of Micro Geometries Generated with Jet Electrochemical Machining

A. Schubert[1][2], M. Hackert[1], and G. Meichsner[2]

[1]Chair Micromanufacturing Technology, Faculty of Mechanical Engineering, Chemnitz University of Technology, Chemnitz, Germany
[2]Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany

Jet Electrochemical Machining (Jet-ECM) is an unconventional procedure for micromachining. Based on localized anodic dissolution three-dimensional geometries and microstructured surfaces can be manufactured using Jet-ECM. COMSOL Multiphysics is used at Chemnitz UT to simulate the electric current density in the jet and the dissolution process. A mesh displacement dependent on the normal current ...

Thermomagnetic Siphoning on a Bundle of Current-Carrying Wires

J.C. Boulware, and S. Jensen
Space Dynamics Laboratory, North Logan, UT, USA

Using COMSOL Multiphysics, studies were performed showing that thermomagnetic siphoning (TMS) is a sufficient manner of regulating the temperature of a bundle of current-carrying wires wrapped with a magnetorheological fluid (MRF) jacket. Because of Curie’s Law, the cooler MRF on the outside of the jacket is drawn towards the wires due to the induced magnetic field. The process continually ...

A Study of Distributed Feed-Back Fiber Laser Sensor for Aeronautical Applications Using COMSOL Multiphysics

I. Lancranjan[1], C. Gavrila[2], S. Miclos[3], and D. Savastru[3]
[1]Advanced Study Centre - National Institute for Aerospace Research Elie Carafoli, Bucharest, Romania
[2]Technical University of Civil Engineering Bucharest, Romania
[3]National Institute R&D of Optoelectronics, INOE 2000, Bucharest, Romania

Distributed Feedback Fiber Laser (DFB-FL) sensors are increasingly used in aeronautical applications. One of the newest such applications consists in detecting the “transition” zone between laminar and turbulent air flow upon the extrados surface of an aircraft wing. In this specific application DFB-FL are operated as air pressure sensors monitoring amplitude variations of ~1 Pa (laminar flow) ...

COMSOL Modelling of a Planar Micro Ion Mobility Spectrometer

R. Cumeras, I. Gràcia, E. Figueras, L. Fonseca, J. Santander, M. Salleras, C. Calaza, N. Sabaté, and C. Cané
Instituto de Microelectrónica de Barcelona, Barcelona, Spain

A micro Planar Ion Mobility Spectrometer (P-FAIMS) has been simulated using multiphysics software. In P-FAIMS target ions are discriminated by the application of the proper separation voltages to the electrodes of the system. Modelling of vapour phase ions of two compounds have been studied for different values of electric field amplitude to gas number density (E/N) ratio: a health risky ...

The Role of 1D & 2D Asymmetric Diffusion Layers In Rectification Through Ion-Selective Membranes

W. Booth, J. Schiffbauer, and B. Edwards
West Virginia University
Star City, WV

Ion-selective membranes can be used in lab-on-a-chip devices for various portable applications in this field. These devices can be used as concentrators for analytical chemistry and for micro-scale filtration. Here, a binary aqueous electrolyte solution in a microchannel has a potential bias applied across it and it is driven through an ion-selective membrane. Ion concentration gradients form ...