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Simulation of a Microwave Applicator for the Treatment of Petroleum Emulsions

A. V. Vazquez [1, 2], P. M. G. Vite [3],
[1] Universidad Politécnica de Altamira, Altamira, Tamaulipas, México
[2] Universidad Tecnológica de Altamira, Altamira, Tamaulipas, México
[3] TEC/NM, Instituto Tecnológico de Ciudad Madero, Ciudad Madero, Tamaulipas, México

In Mexico there is a decline in the production of oil deposits due to the lack of effective treatment of oil emulsions, which generate a problem in the reinjection of emulsified water, transport of oil with high water content and corrosion in the oil refineries. Through the simulation in COMSOL Multiphysics® software, specifically the modules of RF, Heat Transfer and the Materials library, it ...

Simulation of Auxin Accumulation and Transport in a Plant Root

M. A. Akhmanova [1], M. Fendrych [1], J. Friml [1]
[1] Institute of Science and Technology Austria, Klosterneuburg, Austria

Plant roots have an outstanding ability to grow in the direction of gravity or nutrients. Bending of the root tip in the preferred direction is achieved by asymmetric cell growth on the opposite sides of the root, dictated by asymmetrical distribution of the hormone auxin. Increase in auxin concentration inhibits elongation of cells, whereas decrease in auxin concentration stimulates elongation. ...

Fluid Flow Behavior in Steady and Transient Force Medical Injection Systems

E. Gutierrez-Miravete [1], T. Langley [2],
[1] Rensselaer Polytechnic Institute - Hartford, Hartford, CT, USA
[2] Rensselaer Polytechnic Institute, Troy, NY, USA

Syringes were first conceptualized in 1650, but were invented in 1853 by Dr. Alexander Wood. As of 2011, nearly 8 billion syringes are used each year in the United States for medical purposes (not including veterinary services). These syringes are used for diseases like diabetes, rheumatoid arthritis, multiple sclerosis, and HIV. As injected medication is becoming increasingly more common, ...

A Simple Particle Saltation Model Using Computational Fluid Dynamics

A. Landázuri [1], V. Benavides [1],
[1] Chemical Engineering Department, GICAS Group, Universidad San Francisco de Quito, Quito, Ecuador

A three-dimensional model of particle saltation using computational fluid dynamics (CFD) is presented. This model domain reproduces a flat and irregular terrain with uniform roughness. The domain extends 2 m in X, 0.5 m in Y and 0.5 in Z for both cases. The model includes the motion of particles due to shear force, gravity, drag and the effect of turbulence as a result of the retardation of the ...

A Multiphysics Model of O2 Transport and Recirculation During Venovenous Extracorporeal Life Support

S. Conrad [1],
[1] Louisiana State University Health Sciences Center, Shreveport, LA, USA

Venovenous extracorporeal life support (VV-ECLS) provides gas exchange support for severe lung failure by using an extracorporeal circuit consisting of a blood pump and an artificial membrane lung. Blood is withdrawn from a cannula placed into the inferior vena cava, and returned from the circuit into the superior vena cava, adding oxygen to and removing carbon dioxide from the venous blood. ...

COMSOL® Simulation of Blister Actuated Laser Induced Forward Transfer (Ba-LIFT)

M. Morales [1], , J. J. Moreno [1] , D. Munoz-Martin [1] , C. Molpeceres [1]
[1]Centro Láser UPM, Universidad Politécnica de Madrid, Madrid, Spain

Laser-induced forward transfer (LIFT) is a non-contact direct-write technique that enables the deposition of small volumes of material into user-defined high-resolution patterns with a wide range of structural and functional materials. There are many variations of the LIFT process, each differing in how the laser is absorbed and converted into the mechanical energy required for material ejection ...


王永超 [1], 葛进 [1],
[1] 中国科学技术大学

海上石油泄漏不仅造成资源的浪费,还长期威胁着脆弱的生态系统。然而浮油具有面积大、油层薄、粘度大的特点,难以采用传统的技术和材料来有效地处理。作者利用石墨烯海绵疏水亲油、导电的特点,设计了一种原位加热的方法,有效地较低了原油的粘度,增大了油在海棉里的扩散系数,在解决快速吸附高粘度原油这一世界性难题方面取得了突破性进展。 在这个研究工作中,作者发现很难在实验上获得此方法的能量消耗情况,为了回答这个问题,作者应用 COMSOL® 软件,模拟了石墨烯海绵加热吸油的热传导过程。运用电流模块,模拟石墨烯泡沫通电加热升温的过程,用热传导模块模拟热量通过石墨烯泡沫传递到油、水、空气的过程,并且对电极分布方式进行了优化。作者统计了热量散失在各个组分的比例,结果表明,只有少部分的热量散失在水中,比起传统的电阻丝加热浮油的方法,能耗减少了 65%。

Numerical Demonstration of Finite Element Convergence for Lagrange Elements in COMSOL Multiphysics

M. Gobbert, and S. Yang
Department of Mathematics and Statistics, University of Maryland, Baltimore, MD, USA

The convergence order of finite elements is related to the polynomial order of the basis functions used on each element, with higher order polynomials yielding better convergence orders. However, two issues can prevent this convergence order from being achieved: the lack of regularity of the PDE solution and the poor approximation of curved boundaries by polygonal meshes. We show studies for ...

Nonlinear Ferrohydrodynamics of Magnetic Fluids

Markus Zahn
Massachusetts Institute of Technology, Cambridge, MA, USA

Markus Zahn received all his education at MIT, was a professor in the Department of Electrical Engineering at the University of Florida, Gainesville from 1970-1980, and then joined the MIT Department of Electrical Engineering and Computer Science faculty in 1980. He works in the Laboratory for Eelectromagnetic and Eelectronic Systems, in the MIT High Voltage Research Laboratory, is the Director ...

Finite-Element Evaluation of Thermal Response Tests Performed on U-Tube Borehole Heat Exchangers

E. Zanchini, and T. Terlizzese
[1]Dipartimento di Ingegneria Energetica, Nucleare e del Controllo Ambientale, Università di Bologna, Bologna, Italy

The results of two thermal response tests recently performed on two vertical borehole heat exchangers (BHEs) are presented. The BHEs have the same cross section and a depth of 100 m and 120 m respectively. The evaluation of the thermal properties of the ground and grout are performed by a finite-element simulation method, developed through the software package COMSOL Multiphysics 3.4.