Flow field based data processing for the oscillating conical bob interfacial shear rheometer

Tajuelo, J., Rubio Álvarez, Miguel Ángel y Pastor, Juan Manuel . (2018) Flow field based data processing for the oscillating conical bob interfacial shear rheometer. Journal of Rheology

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Título Flow field based data processing for the oscillating conical bob interfacial shear rheometer
Autor(es) Tajuelo, J.
Rubio Álvarez, Miguel Ángel
Pastor, Juan Manuel
Materia(s) Física
Abstract A rotational rheometer can be used as an interfacial shear rheometer (ISR) by means of proper accessories that allow one to shear fluid-fluid interfaces in a controlled manner. One of the most used accessories, even commercially available, is based on a biconical bob geometry. However, recovering the correct values of the rheological variables is far from trivial. A strategy that has proved to be successful in other ISRs is to properly account for the interface and subphase drags by numerically finding the corresponding flow fields and, then, use an iterative scheme to recover the proper values of the complex Boussinesq number and, consequently, the dynamic surface moduli. Here, we propose to use such a scheme for the biconical bob oscillatory rheometer. We compare our solution with different well known previous approximations, and discuss under which conditions those approximations may lead to errors in the data processing. We have tested the performance of our design and numerical framework on several interfacial systems, comparing the results to those obtained through a magnetic needle rheometer (ISR). We demonstrate that, even for relatively low values of the Boussinesq number, the numerical flow field solution here proposed allows one to precisely reproduce the results obtained by the ISR, while those approximations based on a linear velocity decay at the interface may introduce spurious effects on the calculation of the dynamic surface moduli.
Palabras clave Rotational dynamics
Data processing
Thin films
Chemical elements
Polymers
Air-water interface
Fluid mechanics
Rheometer
Viscosity measurements
Fatty acids
Editor(es) American Institute of Physics
Fecha 2018-01-01
Formato application/pdf
Identificador bibliuned:DptoFF-FCIE-Articulos-Marubio-0005
http://e-spacio.uned.es/fez/view/bibliuned:DptoFF-FCIE-Articulos-Marubio-0005
DOI - identifier 10.1122/1.5012764
ISSN - identifier 1520-8516
Nombre de la revista Journal of Rheology
Número de Volumen 62
Página inicial 295
Página final 311
Publicado en la Revista Journal of Rheology
Idioma eng
Versión de la publicación acceptedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by-nc-nd/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales La versión registrada de este artículo, publicado por primera vez en Journal of Rheology, está disponible en línea en el sitio web del editor: American Institute of Physics https://doi.org/10.1122/1.5012764
Notas adicionales The registered version of this article, first published in Journal of Rheology, is available online at the publisher's website: American Institute of Physics https://doi.org/10.1122/1.5012764

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Creado: Fri, 09 Feb 2024, 04:37:34 CET