The Transient Modeling of Single-Bubble Nucleate Boiling in a Sub-Cooled Liquid Using an ALE Moving Mesh
C. J. Forster, and M. K. Smith
Georgia Institute of Technology
This paper investigates the evolution of a single bubble going through growth, pinch-off, and condensation while rising due to buoyancy forces in a sub-cooled liquid. Phase change is modeled on the evolving liquid-vapor interface by considering changes in enthalpy and heat fluxes at the interface. A comparison of the ALE model is made with the same single-bubble system computed with a level-set ...
A. Roday, and P. Nicosia
Garlock Sealing Technologies
Sintering is an important step in the manufacturing of polytetrafluoroethylene (PTFE) billets. The challenge in heating large billets stems from the inherent low thermal conductivity of PTFE. Existing literature suggests determining maximum heating rate experimentally using recommended guidelines. This paper uses COMSOL to aid in optimizing the temperature profile required for a particular ...
P. Lin, C. Chang, H. Huang, and B. Zheng
Mechanical and Aerospace Eng., Rutgers, The State University of New Jersey, Piscataway, NJ
FTR Systems (Shanghai) Inc., Shanghai, China
PolarOnyx, Inc., San Jose, CA
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 ...
N. Bhalla, S. Li, and D. Chung
Chung Yuan Christian University, Taiwan, (R.O.C)
National Tsing Hua University, Taiwan, (R.O.C)
Different configurations of MEMS based accelerometer has been made and analysed using COMSOL Multiphysics. The designs presented in this paper consist of a square shaped proof mass with flexures supporting it. Different position and varied number of supporting flexures attached to the proof mass makes each configuration distinct. The piezoresistors are placed near the proof mass and frame ends on ...
A. Sun, and S. Murray
Dept. of Biomedical Engineering
UCLA, Los Angeles, CA
Implantable Collagen sponges are used in Spinal Surgery as Drug Delivery Scaffolds. An optimal concentration of growth factor that strikes a balance between bone growth and adverse diffusion effects is difficult to find. The porous sponge also serves as a scaffold for Osteoblast growth, and fluid shear has been shown to mediate biological effects on that cell type. We use COMSOL Multiphysics ...
Keisoku Engineering System Co. Ltd.
A study of an atmospheric pressure direct current microplasma discharge in He/N2 is performed using COMSOL Multiphysics. The calculation of heat transfer is fully coupled with the plasma simulation so as to resolve the gas heating in discharges. A simple circuit model is used to decide the discharge voltage so that the current-voltage (I-V) characteristics are obtained. The I-V characteristics ...
M. Gobbert, and D. Trott
University of Maryland Baltimore County
Many application problems have non-smooth forcing terms, such as the Dirac delta function. The convergence order for the FEM solution is limited by the regularity of the solution in this case. This paper presents information on the techniques needed in COMSOL 4 to enable FEM convergence studies for time-dependent problems of this type, including how to correctly implement the Dirac delta ...
T. Ekwevugbe, and G. Bevan
Institute of Energy and Sustainable Development, De Montfort University, Leicester, United Kingdom
School of Engineering and Computing, Glasgow Caledonian University, Glasgow, Scotland
An investigation was undertaken into the suitability of using COMSOL for modeling an aircraft capacitive fuel gauging unit. A model of a sensor immersed in a fluid was developed for rectangular tank geometry with a range of fluid levels and sensor orientation using the electrostatics application mode in COMSOL’s AC/DC module The importance of modeling the capacitance of air was demonstrated. ...
Optimization of Design Parameters of a Novel MEMS Strain Sensor used for Structural Health Monitoring of Highway Bridges
H. Saboonchi, and D. Ozevin
Civil Engineering Department
University of Illinois at Chicago
The novel Micro Electro Mechanical System (MEMS) based Piezoresistive stain sensor is presented in this paper. The main goal of this sensor is to monitor the localized strain in the highway bridges especially near the crack tips. Monitoring the crack growth on the bridges can lead to early detection and prevention of bridge failures. The COMSOL Multiphysics software was used to optimize the ...
K. Pitchai, S. Birla, J. Diamond Raj, J. Subbiah, and D. Jones
Dept. of Food Science and Technology, University of Nebraska, Lincoln, NE
Dept. of Biological Systems Engineering, University of Nebraska, Lincoln, NE
Indian Institute of Crop Processing Technology, Thanjavur, Tamil Nadu, India
Susceptors are very thin metallic microwave absorbing films used in microwaveable food packaging. They tend to heat up very rapidly during microwave heating and this effect helps to overcome two major issues faced in domestic microwave ovens; 1) Non-uniform heating and 2) lack of browning. While susceptors are being widely used, there is still a lack of scientific knowledge about their ...