E. Gutierrez-Miravete, C. J. Walsh
Rensselaer at Hartford, Hartford, CT, USA
General Dynamics-Electric Boat, Groton, CT, USA
The major steps in the beer making process are simple and with some skill, rather good brew can be produced using a common picnic cooler. First, grain (usually barley) is wetted and allowed to partially germinate before dried in a kiln (malting) Next, during mashing in a mash tun reactyor the malted grains are soaked in hot water in to extract the fermentable sugars and then rinsed slowly to ...
Thermal Study of Valve Regulated Lead Acid Batteries and Electronics Chamber Used in Stand-Alone Street Lighting Applications
D. Groulx, J. Skaalum, T. Jamieson
Mechanical Engineering, Dalhousie University, Halifax, NS, Canada
This paper presents a study on the heat generation of Valve-Regulated Lead Acid (VRLA) batteries used in off-grid streetlighting applications from PoleCo, a Halifax based company. One goal of the project was to produce validated COMSOL® models of the enclosure that holds these VRLA batteries. This model can then be used to investigate methods of reducing the temperature of the batteries based on ...
Th. B. J. Campmans,
LBPSIGHT, Nieuwegein, The Netherlands
A installation caused severe hum, with 30 Hz as dominant frequency, causing serious annoyance. The acoustic study showed resonances around 30 Hz. Poor flow conditions existed at the inlet and outlet of the forced draft fan. Flow patterns were studied using CFD. Both the inlet and outlet contained large vortices, causing the strong hum. Changes in the design were studied. The finally changes ...
Numerical Simulations of a Subsonic/Supersonic Coaxial Jet for an Efficient Design of Experimental Setup
D. Guariglia, C. Schram
von Karman Institute for Fluid Dynamics, Sint-Genesius-Rode, Belgium
The flow field of a coaxial jet with the internal (primary) flow being subsonic and the external (secondary) flow being supersonic has been investigated with COMSOL Multiphysics® software. We used the results to correct defects in the nozzle geometry and we evaluated the effect of heat transfer on the shock-cells system. Finally, we verified the stresses in the material to avoid permanent ...
D. Song, R.K. Gupta, and R.P. Chhabra
West Virginia University, Morgantown, WV, USA
Indian Institute of Technology, Kanpur, India
A sphere sedimenting in a cylindrical tube filled with non-Newtonian fluids, including purely viscous and viscoelastic type, is of both practical and fundamental interest. To investigate the effects of shear-thinning and elasticity, four representative constitutive equations are adopted, Newtonian, Carreau, Oldroyd-B and Phan-Thien-Tanner (PTT) models. There is good agreement between our ...
Hochschule Offenburg, FB Maschinenbau und Verfahrenstechnik
Durch Temperaturunterschiede hervorgerufene freie Konvektionsströmungen treten in Natur und Technik in vielfältiger Form in Erscheinung. Damit verbunden sind wichtige Wärmetransportprozesse. Analytische Lösungen sind nur für einfache Sonderfälle bekannt, wie die einschlägige Literatur (Jischa 1982, Merker 1987, Müller&Ehrhard 1999) zeigt. Für die vertikalen Spaltströmungen mit ...
F. Ferrero, R. Meyer, M. Kluge, V. Schröder
BAM Federal Institute for Materials Research and Testing, Berlin, Germany
Adiabatic compression of gases can work as an ignition source and is still one of the main causes of accidents in chemical plants processing tetrafluoroethylene (Reza and Christiansen, 2007). The ignition of tetrafluoroethylene induced by adiabatic compression has been studied experimentally with a setup which allowed for the rapid opening of a high speed valve connecting two portions of a ...
M. Rivero, O. Andreev, A. Thess, S. Cuevas, T. Fröhlich
Institute of Process Measurement and Sensor Technology, Ilmenau University of Technology, Ilmenau, Germany
Helmholtz-Zentrum Dresden-Rossendorf e. V., Institut für Sicherheitsforschung Abteilung Magnetohydrodynamik, Dresden, Germany
Institute of Thermodynamics and Fluid Mechanics, Ilmenau University of Technology, Ilmenau, Germany
Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Temixco, Morelos, México
Flows of electrically conducting liquids in external magnetic fields are present in several applications. In this kind of flow, the inhomogeneous magnetic field creates a breaking force on the conducting fluid. As a result, a stagnant zone is formed in the zone affected by the localized field so that the fluid flows around it. Wakes in magnetohydrodynamic flows present interesting challenges ...
Eswaran M, P. Goyal, Anu Dutta, G.R. Reddy, R. K. Singh , K.K. Vaze
Bhabha Atomic Research Centre, Mumbai, India
A 2-D unsteady viscous flow around two cylinders is studied by numerical solutions of the unsteady Navier-Stokes equations with a finite element formulation using COMSOL Multiphysics®. The results of a numerical investigation of the Strouhal frequencies of two identical, stationary, parallel circular cylinders arranged in staggered configurations is presented in this paper. A simple two cylinder ...
Comparison of Classic and Finned Piston Reciprocating Linear Air Compressor Using COMSOL Multiphyics®
M. Heidari, P. Barrade, A. Rufer
LEI, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
The current work is dedicated to develop a FEM model for compressors using moving mesh. An analytical model is already developed for a classic compressor based on mass and energy balance and is extended to a finned piston compressor. COMSOL Multiphysics® is employed to verify the analytical results and to provide an insight to detailed modeling of the system in desired areas. Moving mesh is ...