In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Hydrodynamics and Mass Transfer in Taylor Flow

F. L. Durán Martínez [1], A. M. Billet [1], C. Julcour-Lebigue [1], F. Larachi [2],
[1] Toulouse University, Toulouse, France
[2] Laval University, Quebec, Canada

In the present work, numerical simulations of a Monolith Reactor (MR) are carried out in order to develop a pre-design tool for industrial-scale reactors applied to highly exothermal reactions. The reacting circular channels (2-4 mm internal diameter) are coated with a few micron thick catalytic layer (washcoat), and host a gas-liquid segmented flow (the so-called Taylor flow) known to enhance ...

Control the Poly-Dispersed Droplet Breakup Mode in a Droplet-based Microfluidic Device by External Electric Field

Y. Li [1], K. Nandakumar [1], M. Jain [1],
[1] Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, USA

Droplet–based microfluidics has received special research attentions in last two decades due to its superior control over fluid flow as well as other unique advantages[1]. By introducing two immiscible fluids into microfluidic systems, the reagent fluid is encapsulated inside discrete droplets or slugs of nanoliter volume [2]. Interestingly, two breakup modes, termed as “mono-dispersed” and ...

Quantitative Assessment of Secondary Flows of Single-phase Fluid through Pipe Bends

Z. Kaldy [1], O. Ayala [1],
[1] Department of Engineering Technology, Old Dominion University, Norfolk, VA, USA

Single-phase fluid flow was simulated passing through various three dimensional pipe elbows. The simulations varied by Reynolds number, curvature ratios, and sweep angles and were all conducted using the k-ε model available in COMSOL Multiphysics® software. The intent of this research was to qualitatively assess the flow characteristics under several different conditions. Many similarities were ...

Optimization of Flow Distribution in the Feed Sparger of a Steam Drum

P. Goyal[1], A. Dutta[1], and A. K. Ghosh[1]
[1] Reactor Safety Division, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra, India

Steam drums of a nuclear power plant separate steam from the steam water mixture and sub cooled incoming feed water returns to the reactor. The entire feed water flow is delivered to the steam drum through the feed water sparger. The feed water sparger is provided with number of inverted ‘j’ type lateral tubes to  distribute the feed water in the drum for proper mixing with the separated ...

Calibration of MHD Flow Meter using COMSOL Multiphysics

S. Sahu[1], R. P .Bhattachryay[1], E. R. Kumar[1]
[1]Institute for Plasma Research, Bhat, Gandhinagar, Gujarat, India.

There is limited option for non-intrusive flow measurement of liquid metals at high temperature. Liquid metal flowing in a conduit along with the transverse magnetic field induces emf in the liquid metal. The emf developed; which has linear dependency on flow velocity; can be used for flow velocity estimation. In case of conducting conduit the emf can be measured at the conduit wall. The main ...

Increasing Heat Transfer in Microchannels with Surface Acoustic Waves - new

S. Berry[1]
[1]Massachusetts Institute of Technology: Lincoln Laboratory, Lexington, MA, USA

In this numerical study, surface acoustic waves (SAWs) are evaluated as a potential disruptive flow technology for enhancing heat transfer in microchannels. Using COMSOL Multiphysics® software, the physics governing acoustics, single-phase-fluid flow and heat transfer are coupled. The results show that acoustic streaming can disrupt the bulk fluid flow, creating rotating vortices within the ...

Fluid Flow Modeling in a Bioreactor Applied to Wine Production

C. Soares [1], N. Padoin [1], P. M. Aballay [2], O. A. Ortiz [2],
[1] Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
[2] Universidad Nacional de San Juan, San Juan, Argentina

Wine quality is strongly dependent on the operation parameters of the production process. In batch or fed batch reactors, the rotating velocity should be carefully controlled to avoid cellular stress and ensure adequate mixing of the mixture. Moreover, precise control of substrates concentration evolution and cellular growth, as well as efficient heat transfer, allows the production of high ...

3D Modelling of Flow Dynamics in Packed Beds of Low Aspect Ratio - new

F. Alzahrani[1], F. Aiouache[1]
[1]Engineering Department, Lancaster University, Lancaster, UK

This work used the 3D CFD modeling to investigate non-uniform deactivation in packed bed reactors of low aspect ratios under steady state and dynamic operations. In order to explore the effects of condition of instability on local deactivation, detailed knowledge of flow dynamics (i.e. local structure of the packed bed, pressure drops and interstitial flow in the void space), heat and mass rate ...

Development of a RheoDSC, an Instrument for Simultaneous Rheological and Calorimetric Measurements

L. Van Lokeren [1], R. Verhelle [1], C. Block [1], P. Van Puyvelde [2], G. Van Assche [1]
[1] Vrije Universiteit Brussel, Brussels, Belgium
[2] Catholic University of Leuven, Leuven, Belgium

Transformations in polymers, such as polymerisation, melting/crystallization, and phase separation/remixing, are associated with changes in both rheological and thermal properties. To permit simultaneous calorimetric and rheometric measurements, the RheoDSC was developed. The RheoDSC combines two commercial instruments, a TA Instruments Q2000 DSC and a TA Instruments AR-G2 dynamic rheometer. A ...

Numerical Analysis of the Thermal Resistance of a Multi-Layer Reflective Insulation Material Enclosed by Cavities under Varied Angles

R.S. Pelzers[1], A.W.M. van Schijndel[2]
[1]Former student Building Physics, Department of the Built Environment, Eindhoven University of Technology, Eindhoven, The Netherlands
[2]Chair Building Physics, Department of the Built Environment, Eindhoven University of Technology, Eindhoven, The Netherlands

A numerical analysis on the thermal performance of a sample, consisting of two cavities surrounding a Multi-Layer Reflective Insulation (MLRI) material, under various angles and for downward and upward heat flows was performed. The sample reached high thermal resistance values when placed (nearly) horizontal under an upward heat flux, while at different angles and heat flux directions the ...