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Flow stabilization and coating thickness reduction through use of multi-slot air-knife in gas jet wiping / J. R. McDermid ; Andrew N. Hrymak ; F. E. Goodwin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)
[article]
Titre : Flow stabilization and coating thickness reduction through use of multi-slot air-knife in gas jet wiping Type de document : texte imprimé Auteurs : J. R. McDermid, Auteur ; Andrew N. Hrymak, Auteur ; F. E. Goodwin, Auteur Année de publication : 2022 Article en page(s) : p. 143-158 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fluides, Mécanique des
Galvanisation
Matériaux -- Epaisseur
RevêtementsTags : 'Balayage au jet de gaz' 'Réduction l'épaisseur du revêtement' 'Lame d'air multi-fentes' 'Galvanisation à chaud continue' 'Modélisation des turbulences' 'Mesures d'épaisseur Index. décimale : 667.9 Revêtements et enduits Résumé : This paper investigates the gas jet wiping process, which is widely employed for controlling the final zinc-alloy coating thickness of a moving steel strip in the continuous hot-dip galvanizing process. In this study, large eddy simulation (LES) was employed to determine the effect of lower velocity symmetric auxiliary jets on main jet stabilization and coating thickness reduction during the gas jet wiping process. For validation purposes, experimental measurements of coating thickness were also carried out for the prediction of final coating thickness via a novel prototype multi-slot air knife used as the wiping actuator. Good agreement was found between the experimental measurements and model predictions for the coating weight, which also confirmed the applicability of the Elsaadawy et al.1 model for the prediction of final coating weight for the multi-slot air knife geometry used. It was found that the jet flapping observed during single jet wiping could be prevented through use of the multi-slot air knife operating with lower velocity symmetric auxiliary jets (Rea/Rem = 0.45) situated on both sides of the main jet. The auxiliary jets modified the flow field in the main jet shear layer and diminished the formation of alternating vortices, which are the main cause of jet flow oscillations. As a result, a stabilized impinging flow with a longer potential core was found for the multi-slot jet configuration. This led to increased pressure gradient and increased shear stresses in the vicinity of the wiping region and, consequently, lower coating weights were obtained through use of the multi-slot air knife compared to the conventional single slot jet. Note de contenu : - Analytical model of film thickness
- Experimental setup
- Numerical simulation
- Results and discussion
- Table 1 : Working liquid properties in the experimental facilityDOI : https://doi.org/10.1007/s11998-021-00570-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00570-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37152
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 143-158[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23313 - Périodique Bibliothèque principale Documentaires Disponible Numerical modeling of the effects of fiber packaging and reinforcement volume ratio on the transverse elasticity modulus of a unidirectional composite material glass/epoxy / Brek Samir in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 30, N° 5-6 (12/2020)
[article]
Titre : Numerical modeling of the effects of fiber packaging and reinforcement volume ratio on the transverse elasticity modulus of a unidirectional composite material glass/epoxy Type de document : texte imprimé Auteurs : Brek Samir, Auteur ; Meddour Belkacem, Auteur ; Groun Brahim, Auteur Année de publication : 2020 Article en page(s) : p. 203-210 Note générale : Bibliogr. Langues : Français (fre) Catégories : Composites à fibres de verre
Epoxydes
Fibres à orientation unidirectionnelle
Micromécanique (physique du solide)
Modèles numériquesTags : 'Composites à fibres de verre' 'Analyse micromécanique' 'Prédiction des propriétés' 'Facteur renforcement' 'Module transverse' 'Lame unidirectionnelle' Epoxy Index. décimale : 668.4 Plastiques, vinyles Résumé : Composite materials are very widely used in the manufacturing of structures because of their specific mechanical properties. However, they are characterized by heterogeneity and anisotropy and they present great challenges in designing and also in predicting their behavior by using the numerical simulation. The unidirectional composite material has a more relevant property which is the transverse elasticity modulus E2. The determination of E2 is still interesting researchers because of the diversity of results obtained by several models and approaches. This study aims to predict the transverse elasticity modulus E2 of a unidirectional Glass/Epoxy composite material, the effect of the arrangement fibers on the transverse elasticity modulus and predict the values of the reinforcement factor used in the Halpin-Tsai model. To do so first we adopted the micromechanical approach, which is accurate but requires much computing, and we used a calculation code based on FEM method and considered two parameters to vary, which are the volume fraction of fibers and the distribution of fibers. The obtained results of numerical modeling were tightly compared to those obtained by the available analytical models and the adopted approach can be used to predict the transverse elasticity modulus E2 and the reinforcement factor ξ. Note de contenu : - ANALYTICAL MODELS BASED ON THE RULE OF MIXTURE : Rule of mixture (ROM) - Halpin-Tsai (HT) and modified Halpin-Tsai (HTM) models - Chamis (CH) model - Tsai with contiguity model
- FINITE ELEMENT MODELING : Objective - Materials and characterizations - Representative volume element (RVE) - Cell geometry used for meshesMesh of the representative volume Calculation of the transverse elasticity module E2 - Calculation of the reinforcement factor ξ
- RESULTS AND DISCUSSION : The effect of the position of the fibers on the transverse modulus of elasticity E2 - Normal stress distribution σ22 - Transverse elasticity module as a function of the volume content of the fibers - Reinforcement factor as a function of the volume content of the fibers
- Table 1 : The elastic characteristics
- Table 2 : Boundary conditions along the 2 and 3 directionsDOI : https://doi.org/10.18280/rcma.305-602 En ligne : https://www.iieta.org/download/file/fid/46441 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37652
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 30, N° 5-6 (12/2020) . - p. 203-210[article]