COMSOL\'s new CFD Module has been tested for laminar and turbulent flows in simple geometries, with couple or segregated solver. These tests allow mesh sensitivities and comparison with analytical solutions. They also give a first idea of cpu time and RAM use for standard cases. In a second part a thermal-fluid simulation of a real industrial application is done: the air flows cooling a large ...
Machine Design, KTH, Stockholm, Sweden
Electrical contacts consists of parts where the surfaces are in contact and where the actual physical contact occur just in a few contact asperity points scattered over the whole apparent contact area. Through these contact spots between the two mating bodies the mechanical load and the electric current is transmitted. Often a soft coating is used to enlarge the real contact area. Modeling the ...
B.A. Wols[1,2], J.A.M.H. Hofman[1,2], W.S.J. Uijttewaal, and J.C. van Dijk
KWR Watercycle Research Institute, Nieuwegein, The Netherlands
Delft University of Technology, Niewegein, The Netherlands
Disinfection of drinking water is required to prevent the outbreak of water-borne diseases. Different treatment steps are available to disinfect the water, such as chlorination, ozonation or UV irradiation. The hydrodynamics of these processes play an important role in their performance. COMSOL Multiphysics was used to simulate the water flow in disinfection installations. Moreover, a particle ...
C. Belavý, and G. Hulkó, and K. Ondrejkovic, and D. Šišmišová
Slovak University of Technology in Bratislava, Bratislava, Slovakia
This paper presents a finite element method based modeling and design of control for distributed parameter systems. First, models of distributed parameter systems in the form of lumped-input/distributed-output systems and structure of control loop are introduced. Next, modeling of temperature fields of the casting die as distributed parameter systems in preheating process is performed in COMSOL ...
A. Bradji, E. Holzbecher, and M.S. Litz
Department of Mathematics, University of Annaba, Algeria
Georg-August Universität Göttingen, Germany
It is well known that the convergence rate of a numerical model is significantly reduced, when the genuine character of the setting with differential equation and boundary condition is not given anymore. Here we examine the decrease of convergence order for models using COMSOL in which the problem set-up includes a coupling between a 1D and a 2D subdomain. In terms of physics we are dealing with ...
A. Jain, and A. Garg
BITS Pilani, Goa Campus, India
Bhartiya Vidyapeeth College, New Delhi, India
An ISFET is an ion-sensitive field effect transistor used to measure ion concentrations in a solution; when the ion concentration changes, the current through the transistor will change accordingly. Here, the solution is used as a gate electrode. A voltage between substrate and the oxide surfaces arises due to an ions sheath. The surface hydrolization of the OH groups of the gate materials ...
Z. Fang[1,2], R. O'Handley, Y. Liu, and M. Yang[2,3]
Pennsylvania State University, University Park, PA, USA
Ferro Solutions Inc., Woburn, MA, USA
Massachusetts Institute of Technology, Cambridge, MA, USA
Here we investigate a promising passive cooling method through making advantage of the unique properties of ferrofluid. When a magnetic dipole or a permanent magnet is put at the hot side of a system, it will attract the cold ferrofluid to the hot place and displace the hot ferrofluid since cold ferrofluid below Tc has much stronger magnetization than that of hot ferrofluid above Tc. Then the ...
A. Alabastri, R. Krahne, A. Giugni, G. Das, R. P. Zaccaria, M. Zanella, I. Franchini, and E. di Fabrizio
Italian Institute of Technology (IIT)
We studied the optical phonon excitations (LO) of ordered arrays of dot/ rod core-shell CdSe/ CdS nanorods by Raman spectroscopy. Upon deposition on planar substrates the nanorods formed super-lattice structures via side-by side assembly into tracks over some microns of length. COMSOL Multiphysics software has been used to calculate the magnitude of the electric field generated by the ...
The Effect of the Disintegration of Chemical Stratification on the Time-dependent Behavior of the Earth’s Mantle
A. Galsa, and M. Herein
Based on recent results from seismology, geochemistry etc. the distinct chemical character of the D’’ layer (lowest part of the mantle around the Earth’s core) has appeared unequivocally. Numerical calculations have been carried out to investigate the effect of the disintegration, mixing and homogenization of the dense D’’ on the time-dependent behavior of mantle convection. A ...
Numerical Simulations of Methane Aromatization with and without a Ceramic Hydrogen Separation Membrane
Z. Li, C. Kjølseth, S. Hernandez Morejudo, R. Haugsrud
University of Oslo, Department of Chemistry, FERMiO, Oslo, Norway
Protia, Oslo, Norway
University of Oslo, Department of Chemistry, InGAP, Oslo, Norway
Oxygen-free methane aromatization has been attracting growing attention due to a potential means for producing high valuable products such as aromatics and hydrogen. Many studies have been focused on catalysts screening and characterization, and elementary thermodynamic steps of the reaction. However, little attention has been paid to fluid dynamics which are important for an industrial ...