Dynamic Measurements with the Bicone Interfacial Shear Rheometer: Numerical Bench-Marking of Flow Field-Based Data Processing
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MDPI
Materia
Interfacial rheology Interfacial shear rheometer Bicone interfacial rheometer Flow field-based data processing
Fecha
2018-12-07Referencia bibliográfica
Sánchez-Puga, P. [et al.]. Dynamic Measurements with the Bicone Interfacial Shear Rheometer: Numerical Bench-Marking of Flow Field-Based Data Processing. Colloids Interfaces 2018, 2, 69; doi:10.3390/colloids2040069.
Patrocinador
This research was funded by Ministerio de Economía, Industria y Competitividad, Gobierno de España, Grant Numbers FIS2013-47350-C5-5-R and FIS2017-86007-C3-3-P. P.S.P. was funded by Consejería de Educación, Juventud y Deporte, Comunidad de Madrid, Research Assistant Grant Number PEJ16/IND/AI-1253.Resumen
Flow field-based methods are becoming increasingly popular for the analysis of interfacial
shear rheology data. Such methods take properly into account the subphase drag by solving the
Navier–Stokes equations for the bulk phase flows, together with the Boussinesq–Scriven boundary
condition at the fluid–fluid interface and the probe equation of motion. Such methods have been
successfully implemented on the double wall-ring (DWR), the magnetic rod (MR), and the bicone
interfacial shear rheometers. However, a study of the errors introduced directly by the numerical
processing is still lacking. Here, we report on a study of the errors introduced exclusively by the
numerical procedure corresponding to the bicone geometry at an air–water interface. In our study, we
set an input value of the complex interfacial viscosity, and we numerically obtained the corresponding
flow field and the complex amplitude ratio for the probe motion. Then, we used the standard
iterative procedure to obtain the calculated complex viscosity value. A detailed comparison of the set
and calculated complex viscosity values was made in wide ranges of the three parameters herein
used, namely the real and imaginary parts of the complex interfacial viscosity and the frequency.
The observed discrepancies yield a detailed landscape of the numerically-introduced errors.