Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Numerical Solutions for the Lévêque Problem of Boundary Layer  Mass or Heat Flux

E. Holzbecher
Weierstrass Institute for Applied Analysis and Stochastics (WIAS), Berlin, Germany

The Lévêque problem is an idealized simple situation concerning the influence of the boundary on the distribution of temperature or mass in Hagen-Poiseuille flow. Here, the performance of numerical solutions is examined for a range of Péclet numbers, spanning 11 orders of magnitude. We examine the Sherwood, resp. Nusselt numbers and confirm the cubic square rule for high flow ...

Entropic Evaluation of Dean Flow Micromixers

P. S. Fodor[1], M. Kaufman[1]
[1]Cleveland State University, Cleveland, OH, USA

In this work we investigate computationally the use of spiral channels at Reynolds numbers from 25 to 900 as a mixing structure (Figure 1) using COMSOL Multiphysics, the CFD Module, and the Chemical Species Transport physics. In this system, the centrifugal forces experienced by the fluid as it travels along the curved trajectory induce counter-rotating flows. The presence of these transversal ...

Iterative Learning Control for Spatio-Temporal Repetitive Processes

D. Kowalów [1], M. Patan [1]
[1] Institute of Control & Computation Engineering, Zielona Góra, Poland

Recently, due to the dynamically increasing complexity of modern systems, a strong necessity appears for more systematic approaches to high quality control and process monitoring. Requirements imposed by process control in the area of spatio-temporal physical systems also called distributed parameter systems (DPSs) are associated with using very accurate models in which spatial dynamics cannot ...

Comparison of Industrial Agitation for Batch Reacting Vessel Mixing in Bioethanol Fermentation

H. Rana [1],
[1] Loughborough University, United Kingdom

This paper presents the investigation into the phenomena during batch reactor vessel mixing comparing agitation equipment; the Rushton turbine and the Marine propeller; in the production of bioethanol by yeast fermentation. The key factors addressed in selecting equipment were fluid vector flow, energy dissipation resulting in shear damage to yeast cells, agitation power consumption, critical ...

Finite Element Study of the Mass Transfer in Annular Reactor - new

Y. M. S. El-Shazly[1], S. W. Eletriby[1]
[1]Alexandria University, Alexandria, Alexandria, Egypt.

The annular reactor is a very useful design to carry many chemical reactions. In this study, COMSOL Multiphysics® software was used to study the isothermal mass transfer from the inner side of the outer tube of the annular reactor in the range of 200

Comparison Between Turbulent and Laminar Bubbly-Flow for Modeling H2/H2O Separation

E. Amores Vera[1], J. Rodríguez Ruiz[1]
[1]Centro Nacional del Hidrógeno, Puertollano, Spain

One of the most critical aspects on water electrolysis is gas-liquid separation, especially in systems with forced convection. The main problem of this kind of circulation is that a gas fraction could return to the electrolysis circuit. A suitable design of separator devices could be a solution in order to avoid a gas return to the electrolysis circuit. In this sense, the use of deflectors might ...

Steady and Unsteady Computational Results of Full Two Dimensional Governing Equations for Annular Internal Condensing Flows

R. Naik[1], S. Mitra[1], A. Narain[1], N. Shankar[1]
[1]Michigan Technological University, Houghton, MI, USA

This paper presents steady and unsteady computational results obtained from numerical solutions of the full two-dimensional governing equations for annular internal condensing flows in a channel. This is achieved by tracking the “sharp” interface while solving the flow fields using COMSOL Multiphysics® and MATLAB®. The unsteady wave simulation capability is used to predict heat-transfer rates ...

Study of Electrochemically Generated Two-Phase Flows

J. Schillings [1], O. Doche [2], J. Deseure [1],
[1] LEPMI, Grenoble, France
[2] SIMAP, Grenoble, France

The dependency of electrochemical processes performances on mass transfer is well-known. Electrolyte flow in the vicinity of electrodes surface can enhance reactions due to increased mass transfer. This flow can be generated by the production of a gaseous phase, leading to a natural bubble-driven convection flow. As a drawback, gas bubbles also modify electrodes active surface and the ...

Simulation of Interstitial Nanoparticle Flow for Development of Tumor-On-A-Chip Device

J. Park [1], M. P. Vidal-Meza [1], R. Zhou [1], S. Barua [1], C. Wang [1],
[1] Missouri University of Science & Technology, Rolla, MO, USA

A simulation was performed to investigate the flow behaviors of drug delivery nanoparticles in a tumor-on-a-chip microfluidic device, which mimics a tumor cell having endothelial cells with micro-sized gaps. The Navier-Stokes equation and the convection-diffusion equation were used to model the flow field and the time-dependent particle distribution in the device, respectively. We investigated ...

COMSOL Multiphysics® Software Simulation Application for Thermoplastics Viscosity Measurement

Q. Guo [1], S. Ahmed [2],
[1] EHC Canada, Inc., Oshawa, ON, Canada
[2] University of Ontario Institute of Technology, Oshawa, ON, Canada

Present study discusses a new method of how to apply numerical simulation in COMSOL Multiphysics® software to improve the accuracy of polymer melts viscosity measurements. The main emphasis is placed on evaluating the effects of entrance and exit geometry of a capillary rheometer on viscosity measurement. By combining experimental and COMSOL® simulation results, an accurate Bagley correction ...