Numeric model of the normative consumption of heat for the colour homogenisation of wood in pressure autoclaves

2016 ◽  
Author(s):  
Ladislav Dzurenda
Keyword(s):  
Numeric Model

The mathematical modelling of corrosion in hot dip galvanized steel reinforced concrete

2011 ◽  
Vol 2 (1) ◽  
pp. 1-12
Author(s):  
A. Hegyi ◽  
H. Vermeşan ◽  
V. Rus
Keyword(s):  
Mathematical Model ◽  
Reinforced Concrete ◽  
Numerical Model ◽  
Equation System ◽  
Galvanized Steel ◽  
Steel Reinforced Concrete ◽  
Numeric Model ◽  
Physical And Mathematical Models ◽  
Physical Phenomena ◽  
The Mathematical Model

Abstract In this paper we wish to present the numerical model elaborated in order to simulate some physical phenomena that influence the general deterioration of steel, whether hot dip galvanized or not, in reinforced concrete. We describe the physical and mathematical models, establishing the corresponding equation system, the initial and boundary conditions. We have also presented the numeric model associated to the mathematical model and the numeric methods of discretization and solution of the differential equations system that describes the mathematical model.

Numeric Model for Assessment of Naphthalene Conversion through Ionization Reactions in a Microwave Air Plasma Torch

2016 ◽  
Vol 30 (9) ◽  
pp. 7704-7712 ◽  
Author(s):  
A. Pilatau ◽  
H. S. Medeiros ◽  
A. S. da Silva Sobrinho ◽  
G. Petraconi Filho
Keyword(s):  
Plasma Torch ◽  
Air Plasma ◽  
Numeric Model

scholarly journals Development and experimental validation of a transient 2D numeric model for radiant walls

2018 ◽  
Vol 115 ◽  
pp. 859-870 ◽  
Author(s):  
Joaquim Romaní ◽  
Luisa F. Cabeza ◽  
Alvaro de Gracia
Keyword(s):  
Experimental Validation ◽  
Numeric Model

Experimental Tests of White UHPC Plates Reinforced by PVA Fibres and Textile Glass Reinforcement

2015 ◽  
Vol 1124 ◽  
pp. 83-88 ◽  
Author(s):  
Tomáš Bittner ◽  
Petr Tej ◽  
Miroslav Vokáč ◽  
Petr Bouška ◽  
Šárka Nenadálova
Keyword(s):  
Experimental Tests ◽  
Lower Surface ◽  
Automatic Measuring ◽  
Numeric Model ◽  
Four Point Bending ◽  
Glass Reinforcement ◽  
Acting Force ◽  
Measuring Unit

The paper is about a research focused on a development of thin slabs made from white UHPC. These slabs are reinforced by scattered PVA fibres and textile glass reinforcement in form of 2D net. The aim of the experiment is the development of tin slabs that can be used as facade or roof panels. The course of the experimental tests of these slabs and its correspondence with the numeric analysis made with ATHENA software is in the paper. Three slab specimens with size of 750 x 125 x 15 mm were tested in four-point bending. The white UHPC matrix was reinforced by the scattered PVA fibres and the 2D textile glass reinforcement with mesh 20 x 20 mm. The used 2D reinforcement was coated against alkali conditions, so called AR - Glass with 2400 TEX fineness. The reinforcement was placed and fixed near the lower surface of the slabs. The course of the tests was continually monitored by an automatic measuring unit where especially the acting force, the deformation in the middle of the span, the deformation in the supports and the progressive formation and development of cracks were detected. The numeric model was created in 3D surroundings of Gid 2011 program and then converted into ATENA software.

Red Cell Injury Assessed in a Numeric Model of a Peripheral Dialysis Needle

ASAIO Journal ◽  
1996 ◽  
Vol 42 (5) ◽  
pp. M524-529 ◽  
Author(s):  
DIRK S. DE WACHTER ◽  
PASCAL R. VERDONCK ◽  
RONNY F. VERHOEVEN ◽  
REMI O. HOMBROUCKX
Keyword(s):  
Cell Injury ◽  
Red Cell ◽  
Numeric Model

Experimental Non-Linear Model Updating Applied in Cylindrical Journal Bearings

2001 ◽  
Author(s):  
Katia Lucchesi Cavalca ◽  
Sérgio Junichi Idehara ◽  
Franco Giuseppe Dedini ◽  
Robson Pederiva
Keyword(s):  
Linear Model ◽  
Model Updating ◽  
Optimization Method ◽  
Model Parameters ◽  
Numeric Model ◽  
Rotating Systems ◽  
Non Linear ◽  
Symmetric Rotor ◽  
Set Up ◽  
Experimental Values

Abstract The present paper proposes the use of non linear model updating applying unrestricted optimization method, in order to obtain a methodology, which allows the calibration of mathematical models in rotating systems. An experimental set up for this purpose consists of a symmetric rotor, on a rigid foundation supported by two hidrodynamic cylindrical bearings and with a central disk of considerable mass, working as na unbalancing excitation force. Once the numeric and experimental values are obtained, error vectors are defined, which are the minimization parameters, through the variation of the numeric model parameters. The method presented satisfactory results, as it was able to calibrate the mathematical model, and then to obtain reliable responses for the physical system studied. The research also presents a contribution for the rotating machine desing area as it presents a relatively simple methodology on the updating and revalidation of computacional models for machines and structures.

Custom 1-D CFD Numeric Model of Single-Cell Scale Sample Holder for Scanning Thermal Analysis

2012 ◽  
Author(s):  
Logan M. Compton ◽  
James L. Armes ◽  
Gary L. Solbrekken
Keyword(s):  
Thermal Analysis ◽  
Heat Capacity ◽  
Thermodynamic Properties ◽  
Latent Heat ◽  
Thermoelectric Module ◽  
Experimental Results ◽  
Sample Holder ◽  
Current Profile ◽  
Scanning Calorimetry ◽  
Numeric Model

Successful cryopreservation protocols have been developed for a limited number of cell types through an extensive amount of experimentation. To optimize current protocols and to develop effective protocols for a larger range of cells and tissues it is imperative that accurate transport models be developed for the cooling process. Such models are dependent on the thermodynamic properties of intracellular and extracellular solutions, including heat capacity, latent heat, and the physical phase change temperatures. Scanning techniques, such as differential-scanning calorimetry (DSC) and differential thermal analysis are effective tools for measuring those thermodynamic properties. It is essential to understand the behavior of the in house fabricated differential-scanning calorimeter given different cooling and warming rates to reassure and validate the obtained experimental results. A 1-D transient CFD code was created in Matlab using Patankar’s theory to not only validate obtained experimental results but aid in optimizing the control system to produce linear cooling and warming rates. A freezing model was also implemented as a subroutine to numerically observe the effect of heat release and absorption of the sample during a run. The numeric model is composed of a multilayer scheme that incorporates a thermoelectric module which provides the primary temperature control along with the micron sized bridge with sample holder and thermocouple. An electric current profile is imported in from either an experimental run to validate results or from an optimization program to determine the optimum electrical current profile for a desired temperature profile. Numeric detection of heat capacity, latent heat, and thermal resistance has also been demonstrated.

scholarly journals A Numeric Model to Simulate Solar Individual Ultraviolet Exposure

2011 ◽  
Vol 87 (3) ◽  
pp. 721-728 ◽  
Author(s):  
David Vernez ◽  
Antoine Milon ◽  
Laurent Francioli ◽  
Jean-Luc Bulliard ◽  
Laurent Vuilleumier ◽  
...  
Keyword(s):  
Ultraviolet Exposure ◽  
Numeric Model

scholarly journals Posttraumatic Orbital Emphysema: A Numerical Model

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Andrzej Skorek ◽  
Paweł Kłosowski ◽  
Łukasz Plichta ◽  
Dorota Raczyńska ◽  
Marcin Zmuda Trzebiatowski ◽  
...  
Keyword(s):  
Elevated Pressure ◽  
Orbital Fracture ◽  
Common Symptom ◽  
Inferior Wall ◽  
Finite Model ◽  
Upper Airways ◽  
Numeric Model ◽  
Orbital Emphysema ◽  
Orbital Wall ◽  
Resilience Modulus

Orbital emphysema is a common symptom accompanying orbital fracture. The pathomechanism is still not recognized and the usually assumed cause, elevated pressure in the upper airways connected with sneezing or coughing, does not always contribute to the occurrence of this type of fracture. Observations based on the finite model (simulating blowout type fracture) of the deformations of the inferior orbital wall after a strike in its lower rim. Authors created a computer numeric model of the orbit with specified features—thickness and resilience modulus. During simulation an evenly spread 14400 N force was applied to the nodular points in the inferior rim (the maximal value not causing cracking of the outer rim, but only ruptures in the inferior wall). The observation was made from1·10-3to1·10-2second after a strike. Right after a strike dislocations of the inferior orbital wall toward the maxillary sinus were observed. Afterwards a retrograde wave of the dislocation of the inferior wall toward the orbit was noticed. Overall dislocation amplitude reached about 6 mm. Based on a numeric model of the orbit submitted to a strike in the inferior wall an existence of a retrograde shock wave causing orbital emphysema has been found.

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