Time-Dependent Thermal Stress and Distortion Analysis During Additive Layer Manufacturing, by Powder Consolidation by Laser Heating
M.S. Yeoman, J. Sidhu
1. Continuum Blue Ltd., Tredomen Innovation & Technology Park, Tredomen, Ystrad Mynach, United Kingdom
BAE Systems, Advanced Technology Centre, Bristol, United Kingdom
A time-dependent COMSOL Multiphysics model of an additive manufacture process, which uses powder consolidation by laser heating was developed, providing a platform to better understanding the manufacture process & provide a tool to reduce resulting distortion & optimization of an additive manufacture process. The model simulates a high intense laser energy source moving along a pre-defined time ...
B. Chinè , M. Monno
Laboratorio MUSP, Macchine Utensili e Sistemi di Produzione, Piacenza, Italy
Politecnico di Milano, Dipartimento di Meccanica, Milano, Italy
Instituto Tecnologico de Costa Rica, Cartago, Costa Rica
Introduction: In metal foams production, nucleated gas bubbles expand in a heated metal in a mold, then the foam cool and solidify. Thereby energy, mass and momentum transfer mechanisms are present simultaneously in the system and must be taken into account. Metal foam (Figure 1) can be obtained by foaming a precursor, i.e. a mixing of aluminum (Al) powders with the blowing agent TiH2, placing it ...
X. Xu, T. Patel, R.W. Hoyt
U.S. Army Institute of Environmental Medicine, Natick, MA, USA
A human torso model was created for heat transfer analysis. The torso was derived from the ‘Virtual Family’ whole-body voxel data from the ITIS Foundation (Zurich, Switzerland). Measurements were taken from the ITIS male along the axial plane at key anatomical landmarks and used to develop geometry in Solidworks. Individual components were created to represent the skin, fat, muscle, and bone ...
M. Giansetti, A. Pezzin, S. Sicardi, G. Rovero
Politecnico di Torino, Torino, Italy
Within wool textile industries, a very important role is played by the so-called finishing processes, in which the textile substrate undergoes steam treatments to achieve the desired level of stabilisation and appearance. Process parameters, namely temperature and moisture content, are known only at the beginning of the process but not in the textile material being treated, where the actual ...
Improving Heating Uniformity of Dried Fruit in RF Treatments for Pest Control: Model Development and Validation - new
B. Alfaifi, J. Tang, Y. Jiao, S. Wang, B. Rasco, S. Jiao, S. Sablani
King Saud University, Riyadh, Saudi Arabia
Washington State University, Pullman, WA, USA
Northwest A&F University, Yangling, Shaanxi, China
Non-uniform heating is one of the most important challenges during the development of radio frequency (RF) heat treatments for pest control. A computer simulation model using finite element–based COMSOL Multiphysics® software was developed to investigate the heating uniformity of raisins packed in a rectangular plastic container and treated using RF heating. The developed model was then ...
Mattarolo, G., Bard, J.
ISET, Institut für Solare Energieversorgungstechnik, Kassel
Thermophotovoltaic (TPV) is an emerging technology based on the direct conversion of thermal radiation coming from a heat source into electricity by using photovoltaic (PV) cells. The first target for the TPV research is to break the threshold of 10% of efficiency, which would allow to start the commercialization of such technology in different applications. Defining and simulating a ...
Ramirez, J.C., Cristea, P., Stan, M.
Materials Science & Technology Division, Los Alamos National Laboratory
The nuclear reaction is modeled as a uniformly distributed volumetric heat source. All heat is conducted from the fuel towards the outer surface of the cladding. A number of results are presented.
COMSOL Multiphysics® as a Tool to Increase Safety in the Handling of Acetylene Cylinders Involved in Fires
F. Ferrero, M. Beckmann-Kluge, and K. Holtappels
BAM Federal Institute for Materials Research and Testing Division II.1 “Gases, Gas Plants”, Berlin, Germany
In this paper a mathematical model for predicting the heating-up of an acetylene cylinder involved in a fire is presented. In the simulations polynomial functions were used to describe the temperature dependency of the thermal properties of the cylinder interior, which is a complex system composed by a solid porous material, a solvent and acetylene dissolved in it. Model equations covered heat ...
Use of COMSOL to Estimate the Thermal Properties and Kinetic Parameters for the Degradation of Anthocyanins in Grape Pomace
D.K. Mishra, and K.D. Dolan[1,2]
 Department of Biosystems and Agricultural Engineering, Michigan State University
 Department of Food Science and Human Nutrition, Michigan State University
Degradation of components in low-moisture and high-temperature food is difficult to model because of the temperature gradient and long heating time. A method was developed to estimate the thermal properties of grape pomace and the rate constant and activation energy of anthocyanin degredation.
S. N. Das, G. Bose
Centurion University of Technology and Managment, Jatani, Bhubaneswar, Orissa, India
Institute of Technical Education and Research, SOA University, Bhubaneswar, Orissa, India
This paper describes the characteristics of MEMS microchannel and various issues of its designing. Here the major parameters are pressure drop and heat transfer rate. Various structures are modeled and optimized to get a minimum pressure drop and maximum heat transfer rate. The simulation results provide the characterization for Temperature, Mass flow rate, Pressure drop and Reynolds number. Here ...