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.

Comparative Numerical Studies of Scramjet Inlet Performance Using k-? Turbulence Model with Adaptive Grids

V. Gopal[1], R. Kolluru[1]
[1]BMS College of Engineering, Bangalore, Karnataka, India

Scramjet inlet design remains as a key aspect for hypersonic flight. To assess the inlet design, the performance parameters namely; air-capture ratio, total pressure efficiency, inlet drag coefficient, and kinetic energy efficiency are evaluated and analysed. In the current study comparison of performance parameters is carried out by performing numerical computation of 2-D turbulent flow field ...

CFD Analysis of Ejectors

Vikas N Bhargav[1], Vivek Ganeshan[1], Muralidhara Holla[1], Ramesh Kolluru[1]
[1]Mechanical Engineering Department, BMS College of Engineering, Bangalore, India

Ejectors are the devices used to carry out mixing and recompression of two fluid streams, one with higher energy and the other with lower Energy. The high energy fluid is passed through the converging nozzle of ejector to very high velocities which in turn creates suction and draws the secondary fluid into the ejector through a secondary inlet. In the present work an attempt is made to ...

A CFD Analysis of the Operating Conditions of a Multitube Pd Membrane for H2 Purification - new

B. Castro-Dominguez[1], R. Ma[1], A. G. Dixon[1], Y. H. Ma[1]
[1]Chemical Engineering Department, Worcester Polytechnic Institute, Worcester, MA, USA

The optimization of operating conditions in multitube membrane modules is highly complex. The multiple physics and irregular geometries involved create a challenge for predicting their behavior. This work analyzes the performance of H2 purification through a module containing seven membranes. Using experimental parameters, a 3-D model was devised, specifying the membrane as a reacting boundary ...

Control the Poly-Dispersed Droplet Breakup Mode in a Droplet-based Microfluidic Device by External Electric Field

Y. Li [1], K. Nandakumar [1], M. Jain [1],
[1] Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, USA

Droplet–based microfluidics has received special research attentions in last two decades due to its superior control over fluid flow as well as other unique advantages[1]. By introducing two immiscible fluids into microfluidic systems, the reagent fluid is encapsulated inside discrete droplets or slugs of nanoliter volume [2]. Interestingly, two breakup modes, termed as “mono-dispersed” and ...

Development of a RheoDSC, an Instrument for Simultaneous Rheological and Calorimetric Measurements

L. Van Lokeren [1], R. Verhelle [1], C. Block [1], P. Van Puyvelde [2], G. Van Assche [1]
[1] Vrije Universiteit Brussel, Brussels, Belgium
[2] Catholic University of Leuven, Leuven, Belgium

Transformations in polymers, such as polymerisation, melting/crystallization, and phase separation/remixing, are associated with changes in both rheological and thermal properties. To permit simultaneous calorimetric and rheometric measurements, the RheoDSC was developed. The RheoDSC combines two commercial instruments, a TA Instruments Q2000 DSC and a TA Instruments AR-G2 dynamic rheometer. A ...

Using a Level-Set Model to Estimate Dwell Time in a Vacuum Dewatering Process for Paper

K. Rezk[1]
[1]Department of Energy, Environmental and Building Technology, Karlstad University, Kronoparken, Sweden

Water removal during paper manufacturing is an intensive energy process. The dewatering process generally consists of four stages in which the first three stages, water is removed mechanically through vacuum pulses and pressing.The fourth stage involve thermal drying. The vacuum dewatering process has been considered in this work. A laminar level-set method has been applied in order to capture ...

Performance Evaluation of the 19th Century Clipper Ship Cutty Sark: A Comparative Study - new

C. Tonry[1], M. Patel[1], C. Bailey[1], W. Davies[1], J. Harrap[1], E. Kentley[1], P. Mason[1]
[1]University of Greenwich, London, UK

The Cutty Sark, built in 1869 in Dumbarton, is the last intact composite tea clipper ship [1]. One of the last tea clippers built she took part in the tea races back from China. These races caught the public imagination of the day and were widely reported in newspapers [2]. They developed from a desire for ‘fresh’ tea and the first ship to return with the new season’s tea could charge a higher ...

平板膜浓差极化过程的有限元仿真分析

徐佩锋 [1][2], 杨宁 [1],
[1] 江苏大学,镇江,江苏,中国
[2] 江苏农林职业技术学院,句容,江苏,中国

在 COMSOL Multiphysics® 中建立了平板膜组件模型,利用自由—多孔介质流和稀物质传递接口,通过对硅颗粒粒径和料液流速等操作参数及相互约束关系的设置,考察对渗透通量、膜表面处浓度等的影响,对硅颗粒悬浮液平板膜过滤中的浓差极化过程和膜组件的工作性能进行全面的仿真分析。并利用 COMSOL 中的函数、参数化扫描等后处理方式,实现了对仿真结果的可视化输出。仿真结果与实验数据较为一致 ...

Modelling Thermal Time-of-Flight Sensor for Flow Velocity Measurement

O. Ecin[1], E. Engelien[2], M. Malek[2], R. Viga[2], B. Hosticka[1], and A. Grabmaier[2]

[1]Institut of Mikroelektronische Systeme, University Duisburg-Essen, Duisburg, Germany
[2]Institut of Elektronische Bauelemente und Schaltungen, University Duisburg-Essen, Duisburg, Germany

This communication reports on a numeric fluid dynamics simulation on a pipe flow model. The basic background is to determine the velocity of a flowing fluid in a pipe by using the Thermal Time-Of-Flight (TTOF) method on water. The visualization of the temperature and velocity distribution in the pipe model is being carried out in order to enable proper design and optimization of the TTOF sensor. ...

Design of Cooling System for Electronic Devices Using Impinging Jets

P. Lin[1], C. Chang[2], H. Huang[3], and B. Zheng[4]
[1]Mechanical and Aerospace Eng., Rutgers, The State University of New Jersey, Piscataway, NJ
[2]FTR Systems (Shanghai) Inc., Shanghai, China
[3]PolarOnyx, Inc., San Jose, CA
[4]School of Mechatronics Eng., University of Electronic Science and Technology of China, Chengdu, China

The heat sink designs using impinging liquid jets, which form stagnation flows, feature uniform heat transfer coefficients, and provide thin thermal boundary layers, are studied to reduce the heat from GPUs. Three different designs using central, micro, and uniform-cross-section (UCS) central jets are studied and simulated in COMSOL. The efficiency factors, defined as the ratio of total ...