Rheological characterisation of complex fluids by means of relaxation and retardation spectra / J. M. Madiedo in LES CAHIERS DE RHEOLOGIE, Vol. XVI, N° 1 (10/1998)

[article]  inLES CAHIERS DE RHEOLOGIE > Vol. XVI, N° 1 (10/1998) . - p. 411-418 Titre : Rheological characterisation of complex fluids by means of relaxation and retardation spectra Type de document : texte imprimé Auteurs : J. M. Madiedo, Auteur ; C. Callegos, Auteur Année de publication : 1998 Article en page(s) : p. 411-418 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Emulsions Fluides complexes Huiles et graisses Phénomènes de relaxation (matériaux) Rhéologie Index. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : Linear viscoelasticity functions are related to the relaxation or to the retardation spectrum by means of Fredholm integral equations. As these spectra cannot be obtained directly from experimentation, its determination makes necessary to invert these equations. However, it is a well-know fact that the resolution of these equations is an ill-posed problem : even small oscillations in the values of the rheological functions give rise to strong oscillations in the spectra, and the solution becomes unstable and, in some cases, even without hysical sense. For that reason, many approximation methods have been developed to estimate the spectrum. Some of these techniques are reviewed in this work, together with an application to the characterisation of a complex oil-in-water emulsion. Note de contenu : - Calculation methods : Calculation of relaxation and retardation spectra from G(t) and J(t). transform inversion methods - Calculation of relaxation and retardation spectra from harmonic responses. Transform inversion methods - Application to oil-in-water emulsions : Relaxation spectra - Retardation spectra Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36548 [article]

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