R. Kreczkiuski, I. Neitzel
Faculdade de Telêmaco Borba - FATEB, Telêmaco Borba, Paraná, Brasil
No processo Kraft a madeira é reduzida a uma massa fibrosa. Neste processo são rompidas as ligações entre as estruturas da madeira separando as fibras. Esta operação, denominada de polpação, é realizada em um equipamento denominado de digestor. Este trabalho analisa o comportamento fluidodinâmico interno a um digestor contínuo do tipo Kamyr.
A. Pellegrini, A. Beucci, and F. Costa
ALTRAN Italia, Pisa, Italy
In this paper a methodology for calculating the infrared signature of complex objects is presented. The transient thermal analysis allows us to evaluate the temperature distribution on the investigated object, pointing out which parts tend to be warmer. These temperature values are handled in the post processing phase in order to evaluate the zero range radiance distribution and the radiance of ...
S. Curet, M. Mazen Hamoud-Agha
GEPEA, UMR 6144, CNRS, ONIRIS, Université de Nantes, Nantes, France
In this study, COMSOL®4.2a is used to model a microwave heating process in a TE10 rectangular waveguide. The sample consists of a small cylindrical Ca-alginate gel (D = 8 mm, H = 10 mm) inoculated with bacteria Escherichia Coli K12. The sample is placed along the microwave propagation direction into the waveguide. Maxwell’s equations and heat transfer are coupled to a microbial inactivation ...
R. Sikorski, T. Merrill
Rowan University, Glassboro, NJ, USA
Stroke is caused by an interruption of brain blood supply and is one of the leading causes of death and disability. A mild reduction of 2-5°C in tissue temperature through hypothermia has shown reduced tissue infarct size, increased tissue recovery, and positive neurological effects. This paper seeks to predict the outlet blood temperature in the common carotid bifurcation branches. In our ...
R. V. Arimilli, A. H. Nejad, K. Ekici
The University of Tennessee, Knoxville, TN, USA
A new simple air-cooled inverter design is numerically investigated using COMSOL Multiphysics® software. The thermal-fluid analysis is based on a three-dimensional conjugate heat transfer model in which the flow field is assumed to be laminar. A rigorous mesh convergence was performed to ensure that the overall energy balance error is within engineering accuracy while the computational cost is ...
A. Talic, S. Cerimovic, F. Kohl, R. Beigelbeck, F. Keplinger, and J. Schalko[1,2]
Research Unit for Integrated Sensor Systems, Austrian Academy of Sciences, Wr. Neustadt, Austria
Institute of Sensor and Actuator Systems, Vienna University of Technology, Vienna, Austria
In this work, we present simulations of a novel micromachined calorimetric flow sensor using COMSOL Multiphysics. The sensor is based on four germanium thermistors that serve as heat sources and as temperature sensors simultaneously. In operational mode, the heated membrane is cooled by any passing flow and the local cooling rate depends on the flow velocity. The simulation results demonstrate ...
Solution of Inverse Thermal Problem for Assessment of Thermal Parameters of Engineered H2 Storage Materials
I. Fedchenia, and B. van Hassel
United Technologies Research Center
East Hartford, CT
Materials based H2 storage systems for light duty vehicles need to meet challenging performance targets that have been developed by the FreedomCAR and Fuel Partnership. On-board reversible metal hydrides are typically integrated with heat transfer surfaces, e.g. in fin and tube heat exchangers, in order to reject the heat of H2 absorption at a high rate which is set by the refueling time ...
Simulation and Analysis of Two Fans Air Speed Match Design in Off-Road Mine Tract Generator Using COMSOL
Y. Shen, D. Wu
Beijing University of Science & Technology, Beijing, China
This paper describes a model of self-ventilated generator cooling on a 170 tons off-road mine dump truck. Considering the space restrictions of mine dump truck, the cooling systems for the generator and the in-wheel motors of the rear axle share one air inlet duct. With the action of generator fan and rear duct fan, cooling air from the inlet duct will be divided into two parts to cool the ...
H. Chen-Mayer, R. E. Tosh
NIST, Gaithersburg, MD, USA
Direct realization of absorbed dose to water in diagnostic radiation via calorimetric methods poses many challenges since the thermal signal of interest may be less than a few microKelvin. In actual biological systems or structures, like the lung, there is the additional complication of tissue heterogeneity, which introduces a quasi-random component to the dose distribution, hence to thermal ...
K.Revathy, S. Agarwal, B. Muralidharan, G. Padmakumar, K. K. Rajan
Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
Electro refining is one of the important step in the Pyro processing nuclear spent fuel with molten salt. The electro refiner is a process vessel consists of anode ,cathodes and stirrers and ultra –high pure argon gas is provided at the top for inert atmosphere and at the bottom a cadmium layer is provided. The vapor pressure of the cadmium is high at the operating temperature, the cadmium ...