2 résultat(s) recherche sur le tag ''Vortex'

Non-isothermal simulation of a corner vortex within entry flow for a viscoelastic fluid Huan-Chang Tseng EMAIL logo / Huan-Chang Tseng in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 3 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 3 (2023) . - p. 362-374 Titre : Non-isothermal simulation of a corner vortex within entry flow for a viscoelastic fluid Huan-Chang Tseng EMAIL logo Type de document : texte imprimé Auteurs : Huan-Chang Tseng, Auteur Année de publication : 2023 Article en page(s) : p. 362-374 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux) Polyéthylène basse densité Rhéologie Simulation par ordinateur Tags : 'Simulation  numérique  3D'  'Vortex  de  coin'  'Flux  d'entrée'  'Modèle  White-Metzner  modifié'  non  isotherme'  'Fluides  viscoélastiques Index. décimale : 668.4 Plastiques, vinyles Résumé : A modified White-Metzner viscoelastic constitutive equation is incorporated into the state-of-the-art Three Dimensional Computational Fluid Dynamics (3D-CFD) framework for performing isothermal and non-isothermal entry flow simulations of a polymer melt. As a result, the corner vortex becomes smaller with increased isothermal temperature, namely, the so-called temperature-induced vortex reduction. In addition, the vortex grows with raising wall temperatures, whereas the vortex reduction is found under high inlet temperatures. Through the visualized flow patterns, it is significant to investigate the dramatic variations of vortex size in relation to fluid temperature, weighted viscosity and extension rate, as well as Weissenberg number and Trouton ratio. Note de contenu : - THEORETICAL BACKGROUND : GNF shear viscosity - GNF-X weighted shear/extensional viscosity - WMT-X viscoelastic constitutive equation - RESULTS AND DISCUSSION : Fit of WMT-X model to viscoelastic material functions - Temperature induced vortex reduction within isothermal entry flow - Simulations of non-isothermal entry flow with vortex streamline - Table 1 : Shear viscosity parameters of Cross-WLF model for LDPE melt - Table 2 : Extensional viscosity parameters of Trouton ratio of GNF-X model for LDPE melt - Table 3 : N 1 parameters of Weissenberg number of WMT-X model for LDPE melt - Table 4 : -N 2/N 1 ratio parameters of WMT-X model for LDPE melt DOI : https://doi.org/10.1515/ipp-2022-4312 En ligne : https://drive.google.com/file/d/1ftb1rtH9JYA2Lsi7n9bhLsQcRctU6-zO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39698 [article]

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Effect of sloped die lip geometry on the operability window in slot coating flows using viscocapillary and two-dimensional models / Si Hyung Lee in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 1 (01/2014) . - p. 47-55 Titre : Effect of sloped die lip geometry on the operability window in slot coating flows using viscocapillary and two-dimensional models Type de document : texte imprimé Auteurs : Si Hyung Lee, Auteur ; See Jo Kim, Auteur ; Jaewook Nam, Auteur ; Hyun Wook Jung, Auteur ; Jae Chun Hyun, Auteur Année de publication : 2014 Article en page(s) : p. 47-55 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Enduction par filière Revêtements Tags : 'Buse  à  lèvres'  'Vortex  en  amont'  aval'  'Fenêtre  inclinée'  'Modèle  de  Navier-Stokes'  Visco-capillaire'  Revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : As an indicator for determining the operability window in slot coating flow, the viscocapillary model considering various configurations of upstream and downstream slot die lips was tested and compared with Navier–Stokes two-dimensional model. Bead pressure and sloped lip angle conditions for uniform coating operation demarcated from leaking and bead break-up defects were quantitatively predicted from the position of upstream meniscus from both models. By comparing the results, it is confirmed that the viscocapillary model for many kinds of sloped die lips could predict the operability window accurately. It is also found that there exists vortex or recirculation regimes inside upstream and downstream coating bead regions, depending on the angles of sloped die lips, even for the stable coating flow. The flow control by die lip structure will be usefully applied to design the strategy for the reliable and optimal coating process, including vortex-free windows. Note de contenu : - GOVERNING EQUATIONS FOR COATING BEAD FLOW : Viscocapillary model considering the sloped die configuration - Calculation of 2-D coating bead flow DOI : 10.1007/s11998-013-9504-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-013-9504-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20615 [article]

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