Analysis of the Shear-Thinning viscosity behavior of the Johnson-Segalman viscoelastic fluids

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985840%3A_____%2F22%3A00556906" target="_blank" >RIV/67985840:_____/22:00556906 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21220/22:00356598

Výsledek na webu

<a href="https://doi.org/10.3390/fluids7010036" target="_blank" >https://doi.org/10.3390/fluids7010036</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/fluids7010036" target="_blank" >10.3390/fluids7010036</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Analysis of the Shear-Thinning viscosity behavior of the Johnson-Segalman viscoelastic fluids

Popis výsledku v původním jazyce

This paper presents a numerical comparison of viscoelastic shear-thinning fluid flow using a generalized Oldroyd-B model and Johnson-Segalman model under various settings. Results for the standard shear-thinning generalization of Oldroyd-B model are used as a reference for comparison with those obtained for the same flow cases using Johnson-Segalman model that has specific adjustment of convected derivative to assure shear-thinning behavior. The modeling strategy is first briefly described, pointing out the main differences between the generalized Oldroyd-B model (using the Cross model for shear-thinning viscosity) and the Johnson-Segalman model operating in shear-thinning regime. Then, both models are used for blood flow simulation in an idealized stenosed axisymmetric vessel under different flow rates for various model parameters. The simulations are performed using an in-house numerical code based on finite-volume discretization. The obtained results are mutually compared and discussed in detail, focusing on the qualitative assessment of the most distinct flow field differences. It is shown that despite all models sharing the same asymptotic viscosities, the behavior of the Johnson-Segalman model can be (depending on flow regime) quite different from the predictions of the generalized Oldroyd-B model.

Název v anglickém jazyce

Analysis of the Shear-Thinning viscosity behavior of the Johnson-Segalman viscoelastic fluids

Popis výsledku anglicky

This paper presents a numerical comparison of viscoelastic shear-thinning fluid flow using a generalized Oldroyd-B model and Johnson-Segalman model under various settings. Results for the standard shear-thinning generalization of Oldroyd-B model are used as a reference for comparison with those obtained for the same flow cases using Johnson-Segalman model that has specific adjustment of convected derivative to assure shear-thinning behavior. The modeling strategy is first briefly described, pointing out the main differences between the generalized Oldroyd-B model (using the Cross model for shear-thinning viscosity) and the Johnson-Segalman model operating in shear-thinning regime. Then, both models are used for blood flow simulation in an idealized stenosed axisymmetric vessel under different flow rates for various model parameters. The simulations are performed using an in-house numerical code based on finite-volume discretization. The obtained results are mutually compared and discussed in detail, focusing on the qualitative assessment of the most distinct flow field differences. It is shown that despite all models sharing the same asymptotic viscosities, the behavior of the Johnson-Segalman model can be (depending on flow regime) quite different from the predictions of the generalized Oldroyd-B model.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10101 - Pure mathematics

Projekt

<a href="/cs/project/GA19-04243S" target="_blank" >GA19-04243S: Parciální diferenciální rovnice v mechanice a termodynamice tekutin</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Fluids

ISSN

2311-5521

e-ISSN

2311-5521

Svazek periodika

7

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

24

Strana od-do

36

Kód UT WoS článku

000758496900001

EID výsledku v databázi Scopus

2-s2.0-85123623044