M. Silva, T. Ring
Department of Chemical Engineering, University of Utah, Salt Lake City, UT, USA
For combustion simulations, the wall temperature and heat transfer is an important piece of information. Coal combustion systems typically have walls that are initially a cast ceramic, but, with time, slag is deposited on the surface and coal and soot are incorporated into the slag. It is this slag coated ceramic that determines the rate at which heat is transferred from the wall combustion ...
Three-Dimensional Thermal Modeling of Temperature Variation in Concrete Box-Girders Using COMSOL Multiphysics®
S. Abid[1,2], N. Tayşi, M. Özakça
Gaziantep University, Gaziantep, Turkey
Wasit University, Kut, Iraq
The COMSOL's Heat Transfer module was used in this study to evaluate the temperature distribution in concrete box-girders subjected to exterior thermal conditions. The included thermal loads were air temperature, wind speed in addition to solar radiation. Moreover, the reflected radiation from the ground and other surroundings in addition to the mutual radiation between the different surfaces of ...
G. Vigna, L. Spicci
Esaote SPA, Florence, Italy
Self-heating is a problem to consider for Ultrasound Imaging probes. Since the probe is in contact with the skin, it’s necessary to find a solution to lower the front face temperature in order to avoid patient discomfort, even at the most demanding operating condition. One solution consists in the design of a device that drains the heat from the front to the rear of the transducer, where a ...
S. Lazzari, A. Priarone,
DIN, University of Bologna, Bologna, Italy
DIME-TEC, University of Genova, Genova, Italy
The transient behavior of the thermal resistance of single and double U-tube borehole heat exchangers (BHEs) is investigated numerically by means of COMSOL Multiphysics® software with reference to the 2D cross section of usually employed BHEs. The study is performed in a dimensionless parametrical form, the parameters being the ratio between the thermal conductivities of grout and ground, the ...
Espinoza Vallejos, P.A., Duston, C.
Technology Assessment and Transfer
FEMLAB was used to aid in the design of a novel temperature management system. The system under consideration is a heat sink consisting of a carbon foam block brazed to the inside of an aluminum enclosure. The high thermal conductivity carbon foam is structurally reinforced and filled with a phase change material. A phase change material (PCM) is a substance which releases a large amount of ...
Océ Printing Systems GmbH, Poing
The electrophotographic print process uses polymer toner particles to create the desired print image on the paper. After depositing the particles on the paper, the particle layer has to be heated beyond the glass point of the polymer to create a homogeneous layer. This fusing process is one of the most energy-consuming parts of the whole print process. It is therefore imperative to limit the ...
Effects of the Film Thickness on the Transient Conjugate Opticalthermal Fields in Thin Films Irradiated by Moving Sources in Back and Front Treatments
N. Bianco, O. Manca, S.Nardini, and D. Ricci
DETEC, Università degli Studi di Napoli Federico II, Napoli, Italy
DIAM, Seconda Università degli Studi di Napoli, Aversa, CE, Italy
A two dimensional transient analysis of the conjugate optical-thermal fields induced in a multilayer thin film structure by a moving Gaussian laser source is carried out numerically in order to compare back and front laser treatment processes. Thermal and optical nonlinearity is induced during transient heating, since the response of weakly absorbing thin films depends on temperature. The heat ...
M.J. Jakubinek[1,2], C.A. Whitman[2,3], and M.A. White[1,2,3]
Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
Institute for Research in Materials, Dalhousie University, Halifax, Nova Scotia, Canada
Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada
There is considerable interest in the possibility of combining NTE materials with normal (positive) thermal expansion materials, to reduce the potential of failure of a material or component due to thermal stress fracture. Finite element analysis (FEM) is used to explore the overall expansion and thermal stress in composites.
National Physical Laboratory, Teddington, Middlesex
This paper describes the use of COMSOL Multiphysics to evaluate the propagation of the liquid-solid interface in fixed point crucibles, and the resulting temperature distribution throughout the system as the phase transition progresses. This enables a robust identification of the features of the melting curve corresponding to physical phenomena such as the liquidus point, and also enhances the ...
C. Belavý, G. Hulkó, P. Buček, and S. Lel'o
Slovak University of Technology in Bratislava, Bratislava, Slovakia
Technological processes in the engineering practice from point of view of systems and control theory are frequently in the form of distributed parameter systems (DPS). Techniques of FEM based modeling and design of control synthesis methods of DPS which is acceptable for various technological processes, will be demonstrated on modeling and control of temperature fields of the glass melting ...