Mesoscopic single and multi-mode rheological models for polymeric melts viscometric flows description

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985874%3A_____%2F18%3A00503720" target="_blank" >RIV/67985874:_____/18:00503720 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Mesoscopic single and multi-mode rheological models for polymeric melts viscometric flows description
Original language description
The Vinogradov and Pokrovskii rheological model was extended for a description of rheological behaviour of branched polymer melts. Since stationary elongational viscosity is a nonmonotonic function of the elongational rate, it required a generalization of the law of internal friction for beads of macromolecule. To achieve high prediction accuracy was proposed multi-mode approximation. The contribution of each independent mode to a stress tensor corresponds to the individual polymer fractions differing in relaxation time and viscosity. The theoretical predictions of the generalized model provide a good agreement with the measured steady and transient rheological characteristics of two samples branched low density polyethylenes.
Czech name
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Czech description
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Project
<a href="/en/project/GA103%2F09%2F2066" target="_blank" >GA103/09/2066: Analysis and development of constitutive equations for description of non-Newtonian fluids</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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