S. Sandoval Torres, A. de Lourdes Allier González, L.L. Méndez Lagunas
Instituto Politécnico Nacional, CIIDIR, Oaxaca, Mexico
In this work we solve a model to simulate the drying of potatoes slices. The model considers both the transport of free and vapor water by applying a mechanistic approach. The critical moisture point (CMP) was considered, since it is a transition zone and it represents the point where water saturation is near from cero and hygroscopic domain begins. The CMP divides the hygroscopic and ...
Advanced Modeling of Friction Stir Welding – Improved Material Model for Aluminum Alloys and Modeling of Different Materials with Different Properties by Using the Level Set Method
Wilhelm Gronbach GmbH, Wasserburg a. Inn, Germany
Friction Stir Welding (FSW) has gained much importance throughout the last years. Beside comprehensive experimental work that has been carried out, the simulation of the welding zone is of major interest. Due to the high strains observed within the welding zone, the Eulerian (CFD) approach seems to be the most promising for the prediction of flow around the FSW tool. However, the CFD ...
P. S. Fodor, M. Kaufman
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 ...
P. Nakielski, T. Kowalczyk, T.A. Kowalewski
Institute of Fundamental Technological Research Polish Academy of Sciences, Warsaw, Poland
Comprehensive studies of drug transport in nanofibres based mats have been performed to predict drug release kinetics. The paper presents our approach to analyze the impact of fibers arrangement, one of the parameters varied in our parallel experimental studies. COMSOL Multiphysics® has been used to assess the impact of the various purposed arrangements of fibers within the mat. Drug release ...
Y. Lu, E. Garboczi, D. Bentz
National Institute of Standards and Technology, Gaithersburg, MD, USA
The prediction of concrete materials service life is not easy, because the complex heterogeneous microstructure and the random nature of concrete materials. Study the presence of cracks in concrete and their effect on coupled reaction and transport are of great interest in civil engineering. Cracks with different widths and depths will reduce the cover thickness and accelerate the migration of ...
Numerical Study of the Controlled Droplet Breakup by Static Electric Fields inside a Microfluidic Flow-focusing Device
Y. Li, K. Nandakumar, M. Jain
Louisiana State Univeristy, Baton Rouge, LA, USA
Conventional passive microfluidic flow-focusing devices confront difficulties in controlling droplet sizes in dripping regime especially when the dispersed phase has a large viscosity. It is reported that external electric field can be used to manipulate the droplet breakup. In the present study, a computational fluid dynamics based level-set method coupled with perfect dielectric model has been ...
A. Mulye, S. Potnis
Northeastern University, Boston, MA, USA
VIT, Mumbai, Maharashtra, India
We present an optimized and efficient design of an electrohydrodynamic (EHD) micropump for high performance in microscale and biological applications. We are targeting two major applications, a parylene C design for electrically-actuated medicine delivery, and a silicon-based pump design for on-chip cooling of microprocessors and SOCs. The EHD micropump works on the movement of microscale ...
Sulfur Deactivation Effects on Catalytic Steam Reforming of Methane Produced by Biomass Gasification
P. Sadooghi, R. Rauch
Vienna University of Technology, Vienna, Austria
Sulfur, which is incorporated in the biomass structure, is released into the product gas during gasification as hydrogen sulfide. Hydrogen sulfide is known to deactivate nickel based steam reforming catalysts by chemisorption on the metal surface during steam reforming process. Desulfurization has a negative effect on the process efficiency therefore steam reforming has to be run without ...
J.R. Puentes, T.A. Osswald, S. Schick, J. Berg
Polymer Engineering Center, University of Wisconsin, Madison, WI, USA
TEEL Plastics, Baraboo, WI, USA
The extrusion of polyolefin pipes suffers degradation due to mechanical design problems of the extrusion die that is commonly used. This study uses numerical and computational approaches to detect problematic areas in the die geometry. Simulations show that in the conventional die there are areas of stagnation and recirculation of the melt flow, resulting in greater residence times, one of the ...
A.E. Varela, and J.C. García
University of Carabobo, Valencia, Venezuela
Most reactor designs are based on pseudo homogeneous models. This paper studies the COMSOL simulation of a packed bed reactor using a 2-D heterogeneous model. The case considered was a packed reactor with spherical catalyst for oxidation of o-xylene in air to phthalic anhydride. Large differences in intra-pellet temperature were found in comparison with the average temperatures resulting from ...