Department of Chemical Engineering, Cairo University, Giza, Egypt
Mixing is a typical unit operation that occurs almost in all chemical industries. Static – alternatively termed motionless – mixers are being widely used due to their low power consumption, low capital investment, minimal maintenance costs and versatility. The traditional helical mixing element is mainly used for in-line blending under laminar and transitional flow conditions. The ...
G. Ovchinnikov1, and V. Ovchinnikov2
1Laboratory of Internal Combustion Engines, Vladimir State University, Vladimir, Russia
2Micro and Nanofabrication Centre, Helsinki University of Technology, Finland
Electronic fuel injectors, widely used for gasoline spark ignition engines, are characterized by the fact that the volumetric efficiency, response time and spray pattern drastically change due to build up of deposits in the fluid-flow channels. This study is intended to describe the effect of channel shape and needle valve lift on the characteristics of a fuel flow in the pintle-type injector ...
C. Gualtieri, and G. Ippolito
Dept. of Hydraulic and Environmental Engineering, University of Napoli Federico II, Napoli, Italy
The objective of the paper is to present the results of a numerical study undertaken to investigate the effect of the number of baffles on the efficiency of a contact tank. Several 2-D steady-state and time-variable numerical simulations were performed with COMSOL Multiphysics in a contact tank geometry where a different number of baffles was considered. Residence time distribution (RTD) curves ...
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 ...
J. Volkmann, O. Mohnke, N. Klitzsch, and R. Blaschek
E.ON Energy Research Center, RWTH-Aachen, Aachen, Germany
The frequency dependent electrical impedance of porous media is studied by modelling the charge transport in the electrolyte filled pore space using COMSOL Multiphysics. The corresponding experimental method, called Spectral Induced Polarization (or Impedance Spectroscopy), shows a frequency dependent phase shift between a measured electric current and an applied alternating voltage. It is ...
Department of Chemical Engineering, University of Washington, Seattle, Washington, USA
Mixing is characterized in liquids moving between bubbles when the bubbles are moving down a microfluidic channel. The shape is assumed based on fluid mechanical arguments and experimental observations, and the mixing is characterized for a variety of situations in two and three-dimensions. In COMSOL Multiphysics, an integration coupling variable was used by solving the problem in two dimensions ...
H. van Halewijn
Eindhoven, The Netherlands
For the educational program of Fluid Dynamics at the Fontys Hogeshool of Applied Physics, a wind tunnel was developed for tests of flow profiles of objects, such as a ball, cube or plate. Students are expected to measure the air resistance of a variety of objects, and verify the measurements with the turbulent CFD module of COMSOL. The measurements and the COMSOL simulations match nicely, and ...
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 ...
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 ...
A. Daoud, and N. Kandev
Institut de recherche d'Hydro-Quebec (LTE), Shawinigan, Quebec, Canada
The electromagnetic pumping (EMP) of electrically-conducting fluid is of growing interest for many industrial applications requiring precise flow control, enabling stopping or reversing flow direction without any moving parts or mechanical devices. Presented in this work are the results of a 3D numerical magneto-hydrodynamic (MHD) simulation of direct current (DC) EMP for liquid ...