Modelling and Simulation of Moving Boundaries and Convective Heat Transfer in non-Autogenous Fusion Weld Pools using FEMLAB 3.1
Edstorp, M., Eriksson, K.
University of Trollhättan/Uddevalla, Dep. of Technology, Mathematics & Computer Science, Trollhättan
This article is concerned with the mathematical modelling and simulation of the thermo and fluid dynamics of the molten pool created during an arc fusion welding process with consumable electrodes. Weld pool simulation is a true multiphysics problem in that a model for a typical process such as GMAWis required to incorporate the effects on the transfer of heat and mass that are induced by ...
Institut für Fahrzeugbau Wolfsburg, Fachhochschule Braunschweig/Wolfenbüttel
Die Finite Elemente Methode des Programmes FEMLAB wurde an zwei bekannten Beispielen der Stromungsmechanik und Warmeubertragung gepruft, um die Anwendungsmoglichkeiten in der Heizungs- und Klimatechnik aufzuzeigen. Modellfluid war jeweils trockene Luft im Umge-bungszustand. Der experimentelle Widerstandsbeiwert einer Kugel, der eine Funktion von der Reynolds-Zahl Re ist, wird bei vorgegebener ...
A. Zugliano, R. Artoni, A. Santomaso, and A. Primavera
Danieli & C. Officine Meccaniche S.p.a., Buttrio, UD, Italy
DIPIC, Università di Padova, Padova, Italy
In previous works a dissipative hydrodynamic model was used to simulate the behavior of a dense granular solid flowing through silos with simple geometries or with internal devices, showing good agreement with experimental results. That model has been upgraded taking into account the interaction between the solid itself and a nonreactive gaseous stream flowing countercurrent through it. This ...
University of Nevada, Las Vegas
In this presentation we consider the modeling of indoor air quality, and pollutant transport. Today's aspects of indoor air quality unfortunately must include the potential risk of an attack with biological weapons. In this presentation, we illustrate the effect of such an attack. In the present work, we also present numerical results for indoor air quality for a specific building, namely ...
W. R. Schlichting1, R. T. Lahey Jr.1, M. Z. Podowski1, and T. A. Ortega G?mez2
1Center for Mutliphase Research, Rensselaer Polytechnic Institute, Troy, NY, USA
2Institute for Nuclear & Energy Technologies, Karlsruhe Institute of Technology, Karlsruhe, Germany
Boiling systems must be analyzed to determine their stability characteristics. Multiphase system instabilities can be predicted by the use of a one-dimensional drift-flux model. Using this model, an analysis has been performed with the COMSOL code to investigate both linear and nonlinear instability phenomena. In particular, density-wave oscillations in boiling channels were investigated, and, ...
N. Tiwari, and J. M. Davis
Department of Chemical Engineering, University of Massachusetts, Amherst, MA, USA
The dynamics and stability of a liquid film flowing under the influence of gravity over a planar surface with a rectangular heater are modeled using COMSOL. The temperature variation at the liquid-air interface near the heater induces a gradient in surface tension, or Marangoni stress, that distorts the film shape and gives rise to a pronounced ridge.The shape of the flowing film near the heater ...
Pyrophase Inc., Chicago, IL, USA
In-situ electrical heating technologies are among the most recent technologies used for bitumen recovery from tar sand and oil shale. These technologies have limited environmental impact because there is little disturbance of the land, and water and solvents are not used. Two-phase movement of bitumen and air in tar sand porous deposit is modeled using COMSOL Multiphysics. A system of non-linear ...
S. Carcangiu, A. Fanni, and A. Montisci
Department of Electric and Electronic Engineering
University of Cagliari
In this work an innovative wind power generation in urban areas is proposed. The generation system substitutes the roof of the building and it consists of a static part, the stator, and a moving part, called impeller, which is a centripetal turbine with vertical axis of rotation. Since the objective is to conveying the air flow in the stator, the logarithmic spiral has been chosen as the shape ...
FEMLAB Solution of the Creeping Flow Equations for a Particle in Stagnation Point Flows in the Vicinity of a Wall
Pasol, L., Feuillebois, F.
The fluid velocity and pressure of the floweld around axed spherical particle embedded in an unperturbed axisymmetric creeping flow in the vicinity of a wall is calculated analytically by the method of bipolar coordinates. Results are obtained with a 10-16 precision allowing a comparison with the results from a FEMLAB calculation. Results from the analytical calculation exhibit several cell ...
E. R. Blatchley, and B.Z. Sun
Department of Civil Engineering, Purdue University, West Lafayette, IN, USA
Mineral precipitation on to the quartz surface of the lamp jackets in UV disinfection process (fouling) has been recognized as a major problem for UV radiation delivery during disinfection operation. Fouling behavior was observed to be induced thermally and influenced by hydraulic character of the UV disinfection configuration. Fouling process involves momentum, heat, and mass transport within ...