N. Boufercha, M. Ghahremanpour, M. Schnaithmann, J. Sägebarth, and H. Sandmaier
Universität Stuttgart / IFF-MST, Nobelstr.12, Stuttgart, Germany
The presented paper describes a method for micro precision assembly of very small objects like future microchips, which have a lateral expansion equal to or smaller than 500 μm. The modelling and simulation of a fluidicbased micro assembly method for a microchip with a dimension of (500 x 500 x 100) μm3 is performed with COMSOL Multiphysics. The finite element method is used for ...
A Simplified Numerical Model for Simulating Sliding Door and Surgical Staff Movement in an Operating Theater
Dipartimento di Energetica, Università di Firenze, Firenze, Italy
This paper deals with a numerical investigation on sliding door and people moving effects on the indoor climate of a standard ISO5 class OT with an ultraclean air filter system and a total ceiling unidirectional diffuser. A simple method to analyze the effects on the OT climate by different sliding door conditions combined with crossing persons and persons with a stretcher crossing is provided. ...
M. Divakaran, S. K. Gupta
Department of Chemical Engineering, Indian Institute of Science, Bangalore, Karnataka, India
Due to the coupling of foam flow with foam generation step, the earlier studies on foam flow have not led to consistent results. An increase in flow rate to obtain ?P vs. Q data changes the foam under investigation itself. The controlled experiments carried out earlier in our group show that ?P increases with flow rate as Q^2/3, a weaker dependence than that known for laminar flow or plug flow ...
M. G. Hemanath, C. Meikandamurthy, G. Padmakumar, C. A. Babu, P. Kalyanasundaram, and G. Vaidyanathan
 Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, India
In the pool type Fast Breeder Reactors the roof structure is penetrated by a number of pumps and heat exchangers which are cylindrical in shape. Argon gas in reactor is sandwiched between the free surface of sodium and the roof structure and can flow in the annular space between the components and roof structure forming a thermosyphon. These hermosyphons not only transport heat from sodium to ...
A. Zugliano, R. Artoni, A. Santomaso, A. Primavera, M. Pavlicevic
Danieli & C. Officine Meccaniche, Italy
DIPIC - Universita di Padova, Italy
A simulation of the behavior of bulk solids continuously flowing through a silo with internal flow feeders has been performed by means of a dissipative hydrodynamic model. The results obtained by these calculations and those found experimentally agree, not only with regard to the velocity profiles, but also relative to the pressure on the silo walls. The dissipative hydrodynamic model represents ...
O. Toscanelli, V. Colla
Scuola Superiore S. Anna, Pisa, Italy
The Large Eddy Simulation is an important method to simulate turbulent flow. It does not produce a closed system of equations, to achieve this it is necessary to model the not-closed terms. The deconvolution can be used for this purpose. In this study some numerical experiments on this topic are performed with COMSOL Multiphysics®. The main objectives are to find an efficient way to implement ...
Optimization of the Herringbone Type Micromixer Using Numerical Modelling and Validation by Measurements - new
E. Tóth, K. Iván, P. Fürjes
Pázmány Péter Catholic University, Budapest, Hungary
Research Centre for Natural Sciences Institute for Technical Physics and Materials Science Hungarian Academy of Sciences, Budapest, Hungary
COMSOL Multiphysics® software was used in this study to simulate mixing by diffusion and by secondary flow. Particle tracing model was applied to simulate the mixing of cells in the microchannel. Results agreed well with the measurement, an optimal herring-bone structure was proposed for integration into a bioanalytical system.
J. Plawsky, A. Chatterjee, and P.C. Wayner Jr.
Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York, USA
The Constrained Vapor Bubble is a fundamental fluid mechanics experiment that is scheduled to run aboard the International Space Station starting in August 2009. The experiment is focused on looking at evaporation and condensation processes at the contact line, where vapor, liquid and solid meet. Our goal is to understand how processes that occur on the macroscale affect the transport processes ...
P.K. Jain, V.B. Khane, J.D. Freels
Oak Ridge National Laboratory, Oak Ridge, TN, USA
Missouri University of Science and Technology, Rolla, MO, USA
Simulation models for steady state thermal hydraulics analyses of ORNL’s HFIR have been developed using COMSOL. A single fuel plate and coolant channel of each type of HFIR fuel element was modeled in three dimensions. The standard k-? turbulence model was used in simulating turbulent flow with conjugate heat transfer. The COMSOL models were developed to be fully parameterized to allow ...
M. Dagaonkar, V. Kumaran, R. Venkataraghavan, D. C. Franklin
Unilever R&D, Bangalore, Karnataka, India
Dosing a predetermined quantity of one liquid into another, in a controlled fashion, is a process often encountered in a variety of operations at both industrial and laboratory scales. This process becomes a challenging one if it has to be carried out in a continuous mode, without using any dosing pump and if the dosage levels are very small. A possible simple and elegant solution to the problem ...