Utilizing the Discrete Element Method for the modeling of viscosity in concentrated suspensions
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F16%3A43902724" target="_blank" >RIV/60461373:22340/16:43902724 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1021/acs.langmuir.6b02335" target="_blank" >http://dx.doi.org/10.1021/acs.langmuir.6b02335</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.langmuir.6b02335" target="_blank" >10.1021/acs.langmuir.6b02335</a>
Alternative languages
Result language
angličtina
Original language name
Utilizing the Discrete Element Method for the modeling of viscosity in concentrated suspensions
Original language description
The rheological behavior of concentrated suspensions is a complicated problem, because it originates in the collective motion of particles and their interaction with the surrounding fluid. For this reason, it is difficult to accurately model the effect of various system parameters on the viscosity even for highly simplified systems. We model the viscosity of a hard-sphere suspension subjected to high shear rates using the dynamic Discrete Element Method (DEM) in three spatial dimensions. The contact interaction between particles was described by the Hertz model of elastic spheres (soft-sphere model) and the interaction of particles with flow was accounted for by the two-way coupling approach. The hydrodynamic interaction between particles was described by the lubrication theory accounting for the slip on particle surface. The viscosity in a simple-shear model was evaluated from the force balance on the wall. Obtained results are in close agreement with literature data for systems with hard spheres. Namely, the viscosity is shown to be independent of shear rate and primary particle size for monodisperse suspension. In accordance with theory and experimental data, the viscosity grows rapidly with particle volume fraction. We show that this rheological behavior is predominantly caused by the lubrication forces. A novel approach based on the slip of water on particle surface was developed to overcome the divergent behavior of lubrication forces. This approach was qualitatively validated with literature data from AFM measurements using a colloidal probe. The model presented in this work represents a new, robust and versatile approach to the modeling of viscosity in suspensions with the possibility to include various interaction models and to study their effect on viscosity.
Czech name
—
Czech description
—
Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CI - Industrial chemistry and chemical engineering
OECD FORD branch
—
Result continuities
Project
<a href="/en/project/GA16-22997S" target="_blank" >GA16-22997S: Preparation of Porous Materials by Controlled Assembly of Nanoparticles</a><br>
Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Langmuir
ISSN
0743-7463
e-ISSN
—
Volume of the periodical
32
Issue of the periodical within the volume
33
Country of publishing house
US - UNITED STATES
Number of pages
10
Pages from-to
8451-8460
UT code for WoS article
000381959200018
EID of the result in the Scopus database
—