E. S. Tschoepke, J. A. E. Mazzaferro, G. Paz
Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
Introduction: The main objective of the present work consists in modeling an arc welding heat source to allow predict peak temperature and cooling rate at specific points. The filler metal was deposited on a plate of 32mm thick with no chamfer, in bead on plate configuration, using five different preheat temperatures: -30°C, 30°C, 100°C, 150°C and 200°C. Use of COMSOL Multiphysics® software: ...
D. Kowalów , M. Patan 
 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 ...
Numerical Modelling of a Free-Burning Arc in Argon. A Tool for Understanding the Optical Mirage Effect in a TIG Welding Device
J-M. Bauchire, E. Langlois-Bertrand, and C. de Izarra
GREMI, CNRS, Université d’Orléans, Orléans, France
In this paper, we present the numerical modelling of a free-burning arc and its application to the understanding of optical mirage effect which could occur in a TIG (Tungsten Inert Gas) device used in welding applications.
朱铧丞 , 张春 , 叶菁华 ,
微波作为信息和能量的载体具有同等重要的应用价值，利用微波对物质产生的物理化学效应进行能量传递及转换已经在化学领域有了积极的应用。从 1986 年 R.N. Gedye 等人首次使用微波促进化学反应使其反应速率提高 1240 倍以来，有越来越多的微波和化学领域的科学家对相关问题进行了研究，并出现了一门新兴学科“微波化学”。微波化学作为研究微波能的一个方面是研究微波与化学反应体系相互作用的一个新兴学科。由于当前人们对微波加快化学反应的研究还非常肤浅，微波在大规模应用中并未发挥出其应有的巨大优势，微波化学进一步发展面临着巨大的挑战和机遇。目前微波化学的研究可以分为宏观和微观两个层面：（1）在宏观层面人们并不关心微波对分子之间行为的影响，其研究要用多物理场数值计算方法获得反应体系中电磁场、温度等物理量的分布和变化；（2）微观层面的研究，重点关注微波对反应分子之间相互作用的影响 ...
J. S. Karthikeyan , D. Salvi , M. V. Karwe ,
 Rutgers University, New Brunswick, NJ, USA
Digestion is the process of breaking down food into smaller components, by mechanical and enzymatic action in the digestive tract, so that the smaller nutrient molecules can be more easily absorbed in the intestinal tract. To study and analyze the human digestive process, different methodologies have been used in the past. In general, in vivo feeding studies with humans provide the most accurate ...
B. L. Crossley, M. Kossler, P.J. Collins, R. A. Coutu Jr., and L. A. Starman
Air Force Institute of Technology, Wright-Patterson AFB, Ohio, USA
Carbon nanotubes (CNTs) have been proven experimentally to be well suited for field emission applications. An optimized triode configured CNT field emission array is developed using the COMSOL Multiphysics Electrostatics Application to adjust five key physical dimensions to investigate the effects on the enhanced electric field at the CNT emitter tips. The five dimensions studied are CNT ...
H. Chen , J. Li , S. Xia ,
 Hunan University, Changsha, Hunan, China
 Xi'an Jiaotong University, Xi'an, Shaanxi, China
Introduction In order to understand the detection mechanism of the PZT based nondestructive testing (NDT) technology for interface debonding of CFSTs, numerical simulation on a multi-physical model composed of surface-mounted PZT patches and CFST structural member is established in COMSOL Multiphysics®. The stress propagation process and the electrical signal output of an embedded PZT patch as ...
Atomic Energy of Canada Limited, Pinawa, MB, Canada
The hydro-mechanical (HM) numerical simulation of a shaft seal installed at a fracture zone in a hypothetical host rock using COMSOL is presented. Two different stages are considered in the numerical modelling. Stage 1 simulates the groundwater flow into an open shaft. Stage 2 simulates the groundwater flow after installation of shaft sealing-components. The shaft sealing components include: ...
J. T. Andrews, R. Choubey, O P Choudhary, N. Malviya, A. Patel, M. Kumar, S. Chouksey, J. Solanki
National MEMS Design Center, Department of Applied Physics, Shri G S Institute of Technology & Science, Indore 452003 MP, India
A logic gate performs a certain Boolean logic operation on one or more logical inputs and produces a single logical output. The logic values are either “true” or “false.” Logic gates are bistable devices, that is, they may yield one of these two possible stable outputs. The NAND logic is a universal gate; any logic operation can be performed with various combinations of NAND logics. Many ...
Modeling of Packed Bed Reactors: Hydrogen Production by the Steam Reforming of Methane and Glycerol - new
A. Dixon, B. MacDonald, A. Olm
Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA
The conventional route to hydrogen production is by steam reforming of methane (MSR) in a multitubular packed bed. With the increasing use of biodiesel as a renewable fuel, interest has grown in steam reforming of the excess glycerol produced as a side product (GSR). We use COMSOL Multiphysics® software to model a tubular packed bed reactor, solving a single pellet model at each point. The ...