Varying efficiency of differential constitutive equations based on either steady shear or unsteady (LAOS) characteristics

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985874%3A_____%2F17%3A00487313" target="_blank" >RIV/67985874:_____/17:00487313 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Varying efficiency of differential constitutive equations based on either steady shear or unsteady (LAOS) characteristics

Popis výsledku v původním jazyce

Efficiency of differential constitutive models (exponential Phan-Tien and Tanner, Giesekus, Leonov, and modified eXtended Pom-Pom) describing behaviour of a solution of poly(ethylene oxide) in dimethyl sulfoxide is evaluated in two steps. Firstly, nonlinear parameters of the models are optimized with the respect to steady shear measurements and sonsequently their ability to describe large amplitude oscillatory shear (LAOS) characteristics is tested. Secondly, nonlinear parameters of the models are optimized with the respect to LAOS measurements (both real and imaginary component of the stress amplitude are taken into account) and applicability of the models is tested against steady shear characteristics. In the first case, it is shown that the models are not capable of fitting the LAOS characteristics. In the second case, it is shown that optimization of nonlinear parameters is more responsible. Hence, a determination of the model parameters through LAOS measurements makes the models much more efficient.

Název v anglickém jazyce

Varying efficiency of differential constitutive equations based on either steady shear or unsteady (LAOS) characteristics

Popis výsledku anglicky

Efficiency of differential constitutive models (exponential Phan-Tien and Tanner, Giesekus, Leonov, and modified eXtended Pom-Pom) describing behaviour of a solution of poly(ethylene oxide) in dimethyl sulfoxide is evaluated in two steps. Firstly, nonlinear parameters of the models are optimized with the respect to steady shear measurements and sonsequently their ability to describe large amplitude oscillatory shear (LAOS) characteristics is tested. Secondly, nonlinear parameters of the models are optimized with the respect to LAOS measurements (both real and imaginary component of the stress amplitude are taken into account) and applicability of the models is tested against steady shear characteristics. In the first case, it is shown that the models are not capable of fitting the LAOS characteristics. In the second case, it is shown that optimization of nonlinear parameters is more responsible. Hence, a determination of the model parameters through LAOS measurements makes the models much more efficient.

Druh

O - Ostatní výsledky

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA17-26808S" target="_blank" >GA17-26808S: Charakterizace polymerních tavenin a roztoků pomocí konstitutivních modelů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů