Dipartimento di Ingegneria Industriale, Università degli Studi di Parma, Parma, Italy
The work is focused on the numerical analysis of forced convection in curved tubes investigating the correlation between the heat transfer and friction factor enhancement and the effects of the wall curvature. The analysis was performed by integrating the continuity, momentum and energy equations within COMSOL Multiphysics. The local Nusselt number reaches values higher than the ones expected for ...
Coupled Palaehydrogeological Microbial and Geochemical Reactive Transport Model of the Olkiluoto Site (Finland)
P. Trinchero, M. Luna, J. Molinero, G. Román-Ross, F. Maia, A. Nardi, J. Löfman, P. Pitkänen, L. Koskinen
Amphos 21 Consulting, Barcelona, Spain
VTT Energy, Finland
Posiva Oy, Olkiluoto, Finland
Olkiluoto at Eurajoki has been selected as the final repository site for spent nuclear waste in Finland. This area has been affected, at regional scale, by land-uplift processes related to the ice withdrawal. These events have resulted in a complex and stratified heterogeneous hydrochemical system. The objective of this work was to develop a robust paleohydrogeological reactive transport (PRT) ...
Hydro-Mechanical Modelling of Infiltration Test for a Bentonite-Sand Mixture: Model Verification and Parameter Identification
M. Hasal, R. Hrtus, Z. Michalec, R. Blaheta
Institute of Geonics AS CR, Ostrava, Czech Republic
The first aim of our work is to create a hydro-mechanical model (HM) of unsaturated fluid flow in bentonite-sand mixture (BSM) MX-80. The second aim is to validate and calibrate the developed model by using the data from a laboratory infiltration test of BSM. The used multi-physics model combines Richards type unsaturated flow with diffusive vapour flow and (nonlinear) elastic response of the ...
Determination and Verification of the Forchheimer Coefficients for Ceramic Foam Filters using COMSOL CFD Modeling
M.W. Kennedy, K. Zhang, J.A. Bakken, R.E. Aune
Norwegian University of Science and Technology, Trondheim, Norway
Experiments have been conducted with water at velocities from ~0.015-0.77 m/s to determine the permeability of 50 mm thick commercially available 30, 40, 50 and 80 Pores Per Inch (PPI) Ceramic Foam Filters (CFF) used for liquid metal filtration. Measurements were made using two different setups, for use with the Forchheimer equation: 49 mm \"straight through\" and 101 mm diameter \"expanding flow ...
N. Bianco, R. Capuano, W.K.S. Chiu, S. Cunsolo, V. Naso, M. Oliviero
DETEC, Università degli Studi Federico II, Napoli, Italy
Department of Mechanical Engineering, University of Connecticut, Storrs, CT, USA
A conjugate conductive-convective-radiative discrete model useful for the study and the simulation of heat transfer in a ceramic or metallic foam is presented. A Generation-based Technique is used for the foam representation, using the Weaire-Phelan structure and heat transfer is studied using the COMSOL Multiphysics. The computational domain is made up by a single cell and a fictitious inlet ...
P. Dantan, and M. Faye
 Université Paris7 Denis Diderot
 Université Paris11
In this paper, we introduce a kinetic equation coupled with the Navier-Stokes equations in COMSOL Multiphysics in order to simulate internal structural changes of a flowing complex fluid. Two physical applications are considered, the starting of blood flow in a stenosis and a simulation of a laboratory rheometric set-up. Results show good agreement with the experiments' well known ...
EMIX, St Maurice La Souterraine, France
The optimisation of dimensions, materials choice of heaters in annealing furnaces are done with COMSOL Multiphysics® in 2D-axisymetry. Heat losses sources are identified and corrective actions can be taken in function of simulation results. A power saving of more than 50% is achieved thanks to simulations.
Marc K. Smith
Professor of Mechanical Engineering, Georgia Institute of Technology
Simple, accurate CFD simulations using COMSOL Multiphysics are used in a senior-level undergraduate course as a means to explore a number of fluid flows with the intent of developing a deep understanding of the underlying fluid mechanical mechanisms involved in the flows. Students also learn about the finite element method, how to properly pose the underlying mathematical model for the fluid ...
S.-H. Wang, S. Melendez, M. Gomez
Micro and Precision Manufacturing Center, Kun-Shan University of Technology, Taiwan
This study numerically investigates the fluid dynamics in an Active-Liquid-Heat-Sink (ALHS) for a computer microprocessor cooling system. Principal concepts, basic design, and the integration of the ALHS technology into an internal CPU liquid cooling system are presented. Basic assumptions and numerical methods, especially for rotating machinery in fluid dynamics, are discussed in detail. From ...
B. Chinè , and M. Monno
Laboratorio MUSP, Macchine Utensili e Sistemi di Produzione, Piacenza, Italy and Instituto Tecnologico de Costa Rica, Cartago, Costa Rica
Politecnico di Milano, Dipartimento di Meccanica, Milano, Italy
Modeling and simulation softwares are very useful tools when we have to analyse and understand the different phenomena occurring during metal foams processing, because several simultaneous physical mechanisms have to be accounted for. In this work we use Comsol Multiphysics 4.2 to model a spherical hydrogen gas bubble expanding in aluminium liquid, initially at rest. The aim of the present ...