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 ...
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 ...
A. J. Bosma, and B. A. Reitsma
Tauw bv, Deventer, The Netherlands
The hydraulic design of wastewater treatment plants (WWTP) is usually based on general guidelines and experience. Research and development in this field is mainly focused on understanding and improvement of the biological processes. In this article we present modeling of the activated sludge tanks of the wastewater treatment plants in Amsterdam-West and Eindhoven. For both locations, a number of ...
E. Holzbecher, F. Sun
Georg-August Universität Göttingen, Göttingen, Germany
Within a borehole a nozzle can be installed in order to increase the efficiency of fluid injection. The position of the nozzle is located near the perforated casing of an injection well. A COMSOL Multiphysics® model is set up for a typical nozzle design as applied in practice. The model is based on the Navier-Stokes equations with turbulence closures using k-ε model and k-ω closures. We find a ...
T. Guerra, J. Tiago
Escola Superior de Tecnologia do Barreiro do Instituto Politécnico de Setúbal, Barreiro, Portugal
Instituto Superior Técnico da Universidade de Lisboa, Lisboa, Portugal
Numerical simulations applied to blood flow together with the imaging processing advances are a powerful tool in the prevention and treatment of some diseases. The inclusion of real data in the numerical blood flow simulations allows the achievement of more realistic and accurate results. In the literature, these techniques are known as Data Assimilation (DA). We solve a variational DA problem to ...
F. Boukrouche, C. Moreau, W. Frelin
EDF R&D, Moret-sur-Loing, France
Electric power, in cities or for power plant outflow, is most often transmitted through underground cables. Due to increased electricity demands power suppliers make large investments to house these cables in deep or shallow tunnels. The thermal environment is complex, with different kind of cables placed in different configurations, transmitting different powers. These are hard to take into ...
P. Goyal, A. Dutta, and A. K. Ghosh
 Reactor Safety Division, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra, India
Steam drums of a nuclear power plant separate steam from the steam water mixture and sub cooled incoming feed water returns to the reactor. The entire feed water flow is delivered to the steam drum through the feed water sparger. The feed water sparger is provided with number of inverted ‘j’ type lateral tubes to distribute the feed water in the drum for proper mixing with the separated ...
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 ...
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 ...
J. van Schijndel
Eindhoven University of Technology, Eindhoven, The Netherlands
This paper presents the modeling and simulation results of wind velocities in urban areas. The main idea was to build random generated urban areas for studying the influence of different urban geometries, from relative open to more dense, on wind profiles. The Spalert-Allmaras turbulent flow model turned out to be suitable for domains up to 50 x 50 x 100 m^3. The k-? turbulence model provided ...