Technical Papers and Presentations

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.

Analysis of Heat Transfer and Phase Change in Laser-Assisted Direct Imprinting Processes

F. K. Chung, Y. L. Wang, C. H. Chen
Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung , Taiwan

In this study, a model cast in COMSOL Multiphysics has been developed for the analysis of heat transfer and phase change during laser-assisted direct imprinting processes. The features of this model include the employment of temperature-dependent thermal properties, the use of equivalent specific heat for the treatment of latent heat of fusion, automatically switching the thermal contact ...

Investigating Photonic Crystals

M.-C. Lin
NanoScience Simulation Laboratory, Department of Physics, Fu Jen Catholic University, Taiwan

The outline for this presentation on photonic crystals is:IntroductionMotivationOne-Dimensional Photonic CrystalsTwo-Dimensional Photonic CrystalsSummary and Future Work

The Analysis of High Birefringence Photonic Crystal Fiber with Elliptical Air Holes Cladding

H.-H. Yeh, Y.-F. Chau
Department of Electronic Engineering, Ching Yun University, Taiwan

High birefringence induced by complex unit cells of elliptical air holes in photonic crystal fibers (PCFs) is analyzed numerically using COMSOL Multiphysics. Two types of our proposed PCFs and a previous structure are investigated. The statistical correlations between the birefringence and the various parameters are obtained. The birefringence is found to be largely dependent on the variation of ...

Simulation of the Fluid Dynamics in an Active Liquid Heat Sink for CPU Cooling System

S.-H. Wang, S. Melendez, M. Gomez
Micro and Precision Manufacturing Center, Kun-Shan University of Technology, Taiwan

This study numerically investigates the fluid dynamics in an Active-Liquid-Heat-Sink (ALHS) for a computer microprocessor cooling system. Principal concepts, basic design, and the integration of the ALHS technology into an internal CPU liquid cooling system are presented. Basic assumptions and numerical methods, especially for rotating machinery in fluid dynamics, are discussed in detail. From ...

An Efficient Approach to Identifying a Complete Photonic Band Gap in Two-dimensional Photonic Crystals with Omnidirectional Light Propagation

R. F. Jao1,2, and M.-C. Lin1
1NanoScience Simulation Laboratory, Department of Physics, Fu Jen Catholic University, Taipei County, Taiwan
2Department of Physics, National Cheng Kung University, Tainan, Taiwan

Omnidirectional light propagation in two-dimensional (2D) photonic crystals (PCs) is investigated. An efficient approach to identifying a complete photonic band gap (PBG) in 2D PCs has been developed. The in-plane band structure of 2D photonic crystals is calculated by an adaptive finite element method, as implemented in COMSOL. By adopting the suitable boundary conditions, the eigenvalues can be ...

Simulation of an Atomic Force Microscopy Probe Considering Damping Effects

C.-C. Chou, C.-W. Lee, and M.-H. Yang
Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Taiwan

This paper proposes a numerical model of an atomic force microscopy’s (AFM) probe using the finite element method to simulate the probe’s dynamic behavior under two damping effects: structural damping and squeezed-film damping. These damping effects, especially that of squeezed-film damping, play an important role in AFM’s tapping mode while implemented in an atmospheric or aqueous ...

Space-charge-limited Current in the Quantum Regime by Solving the Schroedinger-Poisson Equation

M.-C. Lin
NanoScience Simulation Laboratory, Department of Physics, Fu Jen Catholic University, Taipei County, Taiwan

The Child-Langmuir law gives the maximum electron current, known as the space-charge-limited current, which arises because the space charge in the diode presents a potential barrier to the incident electrons. While there are modifications due to geometrical and relativistic effects, the limited current remains a fundamental quantity characterizing the beam-gap interaction. In the research of ...

Design Development and Simulation for Electron Field Emission Devices

Chih-Che Kuo
Senior Manager
TECO Group Research Institute
TECO Electric & Machinery Co., Ltd.
Taipei, Taiwan

Here, field emission and field emission devices (FED) are presented, as well as carbon nanotubes (CNT) and the modeling of a carbon nanotube in a field emission device. The device properties are then estimated with model simulation. Keynote speaker's biography: Chih-Che Kuo received his PhD in Engineering in 2001 from the University of Tokyo and was then a research fellow in RIKEN, Japan. ...

Performance Analysis of Grooved Air Bearings in a Micro System

Wang-Long Li
Associate Professor
Institute of Nanotechnology and Microsystems Engineering
National Cheng Kung University
Tainan, Taiwan

The outline of this presentation is: Herringbone grooves Governing equation Geometry Linearization The presentation is written partly in Chinese Keynote speaker's biography:Wang-Long Li received his PhD in 1995 from the Department of Mechanical Engineering at the National Cheng Kung University. He has been using COMSOL Multiphysics since 2002 for research and education in lubrication ...

Design of the Nanoexposure Chamber with COMSOL Multiphysics

Y.-C. Chan1, F.-Y. Li1, and C.-T. Lin2
1Department of Chemistry, National Chung Hsing University, Taiwan
2Department of Applied Mathematics, Providence University, Taiwan

The purpose of this study is to design a chamber for exposing hamsters to nanoparticles and to therefore examine the toxicity of that particular kind of nanoparticles. This simulation was employed to study the fluid dynamic behavior of the nanoparticle inside the chamber to determine the optimal conditions for the location and flow speed of the inlet for nanoparticles and a carrier, inert ...

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