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TIMF - ISSN 2514-4642 - © ISTE Ltd
Thermodynamics of Interfaces and Fluid Mechanics deals with interfaces that are space areas with a low thickness and which separate environments of different properties. They designate phase separation but also thin flames and waves of discontinuity. At a macroscopic scale, they are associated with material surfaces that possess thermodynamic attributes and their own behavior laws.
The analysis of systems with interfaces involves scale changes and the use of specific techniques such as asymptotic developments, the second gradient theory or the phase field model method. Digital simulation is implemented in order to solve the complex systems studied. Testing is an essential step to solve the set problems.
2D varieties of interfaces often coexist with 1D varieties such as ligaments (atomization), contact lines (set drops) or Plateau’s edges (foams).
The articles in the journal deal with all of the mentioned above subjects.
Thermodynamique des interfaces et mécanique des fluides traite des interfaces qui sont des zones de l’espace de faible épaisseur séparant des milieux à propriétés différentes. Elles désignent les séparations de phase, mais aussi les flammes minces et les ondes de discontinuité. A l’échelle macroscopique, on les assimile à des surfaces matérielles douées de propriétés thermodynamiques et possédant leurs propres lois de comportement.
L’analyse des systèmes comprenant des interfaces implique des changements d’échelle et l’utilisation de techniques spécifiques telles que les développements asymptotiques, la théorie du second gradient ou la méthode des champs de phase. La simulation numérique est mise en œuvre pour résoudre les systèmes complexes étudiés. L’expérimentation est une étape indispensable pour résoudre les problèmes posés.
Les variétés 2D que constituent les interfaces coexistent fréquemment avec des variétés 1D telles les ligaments (atomisation), les lignes de contact (gouttes posées) ou les bords de Plateau (mousses).
Les articles de la revue traitent de l’ensemble des disciplines énumérées plus haut.
This paper presents a semi-analytical model of the spherically symmetric droplet transient heating and evaporation in a subcritical environment. In the numerical procedure of the model, the droplet radius is assumed to be fixed during a short time step, but varies from each time step to the next. This variation is obtained through an approximate analytical solution of the heat diffusion equation inside the stagnant droplet, by considering the volume-average or core temperature at the beginning of each time step. Depending on the temperature evolution of the gas phase assumed in quasi-steady state at the immediate vicinity of the droplet, explicit solutions are obtained in the Laplace domain for the droplet internal and surface temperatures. Next, analytical approximations in short time limits, corresponding to the asymptotic expansions of the Laplace domain solutions are derived. In particular, the reduction in droplet radius during the evaporation process is approximated by an analytical expression that is in close agreement with the numerical results. All equations are then applied in their dimensionless form to model the transient heating and evaporation of pure fuel droplets of various sizes. The new model provides a consistent description of both the initial heating phase and the entire evaporation phase of the droplet. Furthermore, the results demonstrate significantly greater computational efficiency than evaporation models using successive time steps, particularly when the series solution of the heat diffusion equation is employed within the droplet.
The simulation engine system is an important issue in the automotive industry because of speeding up the design process, and limit the use of physical prototypes testing. The platform AMESim allows to access to libraries models for simulating engine or vehicle. Modeling approaches (0D/1D) do not however allow to match the 3D code accuracy levels. From this the study is on OpenFoam (simulation software CFD 3D) in order to reduce the problem in 1D with opening new perspectives of computing time, and prediction quality.
Editorial Board
Editor in Chief
Roger PRUD’HOMME
Sorbonne Université – CNRS
[email protected]
Co-Editors
Kwassi ANANI
Université de Lomé
Togo
[email protected]
Abdon ATANGANA
IGS- Bloemfontein
Republic of South Africa
[email protected]
Amine CHADIL
CNRS, MSME
[email protected]
Christian CHAUVEAU
CNRS – ICARE
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Alain MAILFERT
Université de Lorraine
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Mahouton Norbert HOUNKONNOU
University of Abomey-Calavi
Benin
[email protected]
Sébastien TANGUY
IMFT - Toulouse
[email protected]
Pierre TRONTIN
LMFA - Université de Lyon 1
[email protected]
Stéphane VINCENT
Université Paris-Est Marne-La-Vallée
[email protected]