D. Maciel, N. Bouchonneau
Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
The maintenance plan or rush-to-repair of a subsea pipeline for oil transport may result in the shutdown of the line, in other words, may stop the flow of fluid. During the shutdown, the temperature of the oil tends to decrease continuously, and the heavy molecules tend to crystallize and suspend in the oil, which increase the viscosity of the oil, and even form a paraffinic compound or freeze ...
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 ...
Thermal Study of Valve Regulated Lead Acid Batteries and Electronics Chamber Used in Stand-Alone Street Lighting Applications - new
D. Groulx, J. Skaalum, T. Jamieson
Mechanical Engineering, Dalhousie University, Halifax, NS, Canada
This paper presents a study on the heat generation of Valve-Regulated Lead Acid (VRLA) batteries used in off-grid streetlighting applications from PoleCo, a Halifax based company. One goal of the project was to produce validated COMSOL® models of the enclosure that holds these VRLA batteries. This model can then be used to investigate methods of reducing the temperature of the batteries based on ...
G. Escamez, C. Lorin, T. Wu, P. J. Masson
University of Houston, Houston, TX, USA
High temperature superconductors (HTS) such as YBCO coated conductors show great promise for future applications where high magnetic fields are needed. The superconducting state only exists under a critical surface defined in the (J,T,B) space. Quench is the process by which a current-carrying superconducting conductor changes rapidly and irreversibly from the superconducting state to the non ...
Application of Kelvin's Inversion Theorem to the Solution of Laplace's Equation Over a Domain That Includes the Unbounded Exterior of a Sphere
Florida Institute of Technology, Melbourne, FL, USA
In simulating physical systems modeled as solutions of partial differential equations over an unbounded domain, a challenge arises owing to the impossibility to cover an unbounded domain with a mesh. A classical problem in fluid dynamics, a solid sphere of radius a_s is submerged in a tank of water (at rest) of much larger size. The water is disturbed by the sphere’s sudden acceleration in the z ...
K.Govardhan, K.Narmada, Nirmala Grace
VIT University, MEMS & Sensors Division, School of Electronics Engineering, Vellore, Tamil Nadu, India
VIT University, Sensor System Technology, School of Electronics Engineering, Vellore, Tamil Nadu, India
VIT University, Center for Nanotechnology Research, Vellore, Tamil Nadu, India
This study aims at the design and optimization of a Gas Sensing Chamber. The design takes advantage of the multiphysics simulation capabilities of COMSOL Multiphysics® to incorporate various physics such as CFD, Micro fluidics, Solid Mechanics, Electro thermal effects etc. The optimization needs to be done at multiple levels such as mixture of two gases, arriving laminar flow over the substrate, ...
L. F. de Souza
Universidade Federal do Paraná, Curitiba, Paraná, Brazil
A simple steady-state photo-fermentative biochemical model was developed using the COMSOL Multiphysics'® Transport of Diluted Species physics interface. A dimensionless model seeks optimal physical parameters based on given biochemical parameters found in literature. A parametric sweep of the physical parameters is enabled without altering the mesh. Other limitations can be easily added to this ...
F. E. Hizir, H. M. Al-Qahtani[1, 2], D. E. Hardt
Massachusetts Institute of Technology, Cambridge, MA, USA
King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia
Microcontact printing is a method for depositing patterns of thin films or molecular monolayers on surfaces using a polydimethylsiloxane (PDMS) stamp for selective mechanical contact (Figure 1). Undesired deformation of the stamp features during printing affects printed pattern quality. Hence, stamps need to be well-designed to prevent erroneous prints. Existing investigations identify the ...
吴强 , 潘崇佩 , 张琦 ,
“极化激元”是固体物理学中的重要概念，泛指各种极性元激发与光子的耦合。其中，声子极化激元是指晶格振动的声子与电磁场中的光子相互耦合的一种极化激元波。使用飞秒光在铁电晶体铌酸锂中通过光学非线性效应可产生声子极化激元，其频率位于太赫兹波段，在晶格的振动弛豫、太赫兹光谱、与介观微结构作用等领域已有广泛应用。 声子极化激元涉及电磁场和晶格场的耦合问题，其形式满足黄昆方程。我们使用 COMSOL Multiphysics® 的多物理场（偏微分方程组以及射频模块）模拟了块状铌酸锂晶体中产生声子极化激元波的产生和传输。 铌酸锂晶体作为太赫兹应用的集成化平台，可通过在平板波导上引入微结构实现对太赫兹波的调控。诸多手段中，太赫兹天线作为电磁场的传播场与局域场转换的关键部件，对太赫兹通信和太赫兹光谱等领域都有不可替代的作用。基于这一点，我们设计了一种尖端相对的棒状天线结构，使用 COMSOL ...
H. Machrafi[1,2], S. Cavadias
University of Liège, Thermodynamics of Irreversible Phenomena, Liège, Belgium
University Pierre et Marie Curie, Laboratoire des Procédés Plasma et Traitement de Surface, Paris, France
The purpose of this work is to show whether an important difference in Lithium solid concentration and electrolyte concentration can be observed in a Lithium-ion battery model, when considering either the Butler-Volmer kinetics or the Tafel kinetics for describing the electrode kinetics (including a boundary layer between the electrolyte and the electrode particles). During discharge, the ...