A method for the determination of shear viscosity of power–law fluids in a rectangular duct and concentric annulus

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F22%3A00352904" target="_blank" >RIV/68407700:21220/22:00352904 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1002/apj.2727" target="_blank" >https://doi.org/10.1002/apj.2727</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/apj.2727" target="_blank" >10.1002/apj.2727</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A method for the determination of shear viscosity of power–law fluids in a rectangular duct and concentric annulus

Popis výsledku v původním jazyce

This work deals with a practical approach for the determination of the rheological parameters of the purely viscous power–law fluids in the rectangular channel and concentric annulus. The rectangular channels with a height to width ratio (aspect ratio) of less than 0.1 and concentric annulus of large aspect ratios are used for the determination of the shear viscosity of the non-Newtonian fluids. For rectangular channels of aspect ratio greater than 0.1, the determination of the shear viscosity for the power–law model requires two geometrical parameters, according to conventional methods. In this work, a practical method is introduced in order to determine rheological parameters of the power–law fluids for rectangular channels and concentric annulus with the aspect ratios between 0 and 1 using one geometric parameter. The validity of the suggested one-parameter method is firstly compared with the conventionally used two-parameter model analytically. Then, verification is carried out by experimental method using slit viscometer and a rectangular channel with an aspect ratio of 0.2. Obtained wall shear rate-wall shear stress values from both geometries are compared and finally obtained rheological parameters are verified by numerical methods. It has shown that the suggested method is successful for the determination of shear viscosity, and results reveal that rectangular channels with an aspect ratio greater than 0.1 can be used to obtain rheological parameters for power–law fluids.

Název v anglickém jazyce

A method for the determination of shear viscosity of power–law fluids in a rectangular duct and concentric annulus

Popis výsledku anglicky

This work deals with a practical approach for the determination of the rheological parameters of the purely viscous power–law fluids in the rectangular channel and concentric annulus. The rectangular channels with a height to width ratio (aspect ratio) of less than 0.1 and concentric annulus of large aspect ratios are used for the determination of the shear viscosity of the non-Newtonian fluids. For rectangular channels of aspect ratio greater than 0.1, the determination of the shear viscosity for the power–law model requires two geometrical parameters, according to conventional methods. In this work, a practical method is introduced in order to determine rheological parameters of the power–law fluids for rectangular channels and concentric annulus with the aspect ratios between 0 and 1 using one geometric parameter. The validity of the suggested one-parameter method is firstly compared with the conventionally used two-parameter model analytically. Then, verification is carried out by experimental method using slit viscometer and a rectangular channel with an aspect ratio of 0.2. Obtained wall shear rate-wall shear stress values from both geometries are compared and finally obtained rheological parameters are verified by numerical methods. It has shown that the suggested method is successful for the determination of shear viscosity, and results reveal that rectangular channels with an aspect ratio greater than 0.1 can be used to obtain rheological parameters for power–law fluids.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20402 - Chemical process engineering

Projekt

<a href="/cs/project/GA21-07851S" target="_blank" >GA21-07851S: Studium metod modifikace mechanických vlastností a struktury kolagenní hmoty</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Asia-Pacific Journal of Chemical Engineering

ISSN

1932-2135

e-ISSN

1932-2143

Svazek periodika

17

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

—

Kód UT WoS článku

000715632900001

EID výsledku v databázi Scopus

2-s2.0-85118553334