Numerical Simulation of the Heat Transfer to Suspensions of Microencapsulated Phase Change Material (MEPCM)
F. Dammel, and P. Stephan
Technische Universität, Darmstadt, Darmstadt, Germany
The addition of microencapsulated phase change material particles can improve the characteristics of a heat transfer fluid. The numerical simulation of the heat transfer to such MEPCM suspensions with COMSOL Multiphysics is the subject of this contribution. The suspensions are treated as homogeneous liquids with appropriate models for viscosity, thermal conductivity and, most important, specific ...
J.-M. Barois, and C. Goulmy
PHOTONIS, Brive, France
Streak tubes are widely used in high-speed signal analysis; they give spatial, temporal and intensity information about one single event. Time resolutions of 0.7 pico-second can be achieved and in that time-domain, PHOTONIS tubes are second-to-none.Applications are numerous and range from plasma physic to femtosecond laser applications. In streak tubes, electrons move from the photocathode to the ...
C. Hunyar, E. Räuchle, L. Alberts, R. Emmerich, M. Graf, M. Kaiser, and K.-D. Nauenburg
Dept. of Polymer Engineering/Microwave and Plasma, Fraunhofer-Institut Chemische Technologie (ICT), Pfinztal, Germany
Dense plasma can be produced by microwave (2.45 GHz) exited surface waves in a Plasmaline plasma source. This configuration allows one to generate large area plasmas (>1m2), which are well suited for technological applications, e.g., deposition of thin films, surface etching and cleaning in integrated circuit production, disinfection in medical applications, or plasma treatment of waste gases. ...
X. Liu1, J. Zhang1, P. H. Steele1, and J. P. Donohoe2
1Dept. of Forest Products, Mississippi State University, MS, USA
2Dept. of Electrical & Computer Engineering, Mississippi State University, MS, USA
A technique based on the interaction of electromagnetic (EM) fields with the dielectric material is used for the non-destructive evaluation of wood-based material properties. An understanding of how the electromagnetic field is affected by the wood properties is necessary in order to optimize the system performance based on the frequency of the EM field. The COMSOL Multiphysics software package ...
Numerical Simulation of Crystallinity Distribution Developed In the Extrusion of Thick Walled Polypropylene Pipe
R. D. Wilcox1, and J. Collier2
1Chemistry Department, Lincoln Memorial University, Harrogate, TN, USA
2Chemical Engineering Department, Florida State University, Tallahassee, FL, USA
In a numerical simulation for crystallinity distribution, a 36 cm diameter polypropylene pipe with 3.7 cm wall thickness consisting of 3 subdomains that include a die, cooling box, and take-off section was modeled in a 2D axisymmetric geometry using COMSOL Multiphysics.The generalized heat transfer module was used to solve for the temperature distribution in the flowing melt using conductive and ...
Q. Li, and S. Seelecke
Department of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, NC, USA
This presentation deals with a Thermomechanical coupled analysis of a Shape Memory wire actuator. The outline for the Shape Memory Alloy model is:Motivation - Multiple scales and materialsMicro-scale mechanismsMeso-scale lattice elementsMacro-scale elementFree energy conceptUnified approach to various active materials(SMA, PZT, FSMA, etc.)Mathematical modelStatistical thermodynamicsThermally ...
Effects of Plasma Rotation and Magnetic Fields on Convection Flows in the Horizontal Burning High Intensity Discharge Lamps
OSRAM SYLVANIA, Beverly, MA, USA
In this presentation, the effect of a uniform applied magnetic field and a non-uniform field due to a line current (from the lead wire that powered the lamp) are studied and the magnetic fields required to center the arc plasmas are determined. The effects of plasma rotation induced by arc-tube rotation on plasma flows and temperatures are also studied. Critical slip velocities to change the flow ...
T. D. Dreeben
OSRAM SYLVANIA, Beverly, MA, USA
A fully unsteady compressible 2D flow model is used to reproduce observed fluid-mechanical arc instability in a horizontally-running pure-mercury HID lamp. The model represents a 2D lamp cross section normal to the arc, and assumes an infinitely long lamp. Departure from the steady condition is driven by oscillating lamp current. Sound-wave propagation and induced flows result from full coupling ...
Z. Jin Min
Special Materials Lab, DSO National Laboratories, Singapore
A design engineer is often targeted to find the design with the best performance within the constrains in the targeted operational environment. One example of this is the task of designing a lightweight muffler of any design to reduce the engine exhaust noise by 30dBA without any impact on engine efficiency.An FE package, good for such parametric studies, shall provide an open interface for users ...
Modeling Materials through a Phase Transition: Using COMSOL Multiphysics and Applying Physics First Principles Techniques
R. W. Pryor
Pryor Knowledge Systems, Inc., Bloomfield Hills, MI, USA
This paper presents a new phase transition model that is easily created and runs rapidly. It is designed so that the modeler can determine immediately the relative accuracy of the end result by use of the first principles of physics.Phase transitions are readily observable in many commonly utilized engineering materials. In fact, most modern devices and/or tools employ a phase transition in their ...