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Rheologica Acta

Erschienen in:

01.02.2012 | Original Contribution

Effect of interfacial modifier on single drop deformation and breakup in step increasing shear flow

verfasst von: Foroud Abbassi-Sourki, Mosto Bousmina, Michel A. Huneault

Erschienen in: Rheologica Acta | Ausgabe 2/2012

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Abstract

This work deals with in situ visualisation of deformation and breakup of a copolymer modified single Newtonian drop immersed in a Newtonian homogenous matrix. The experiments were carried out on a model system made of poly-isobutylene as the suspending fluid and two poly-dimethylsiloxanes with different molecular weights as the drop phase with viscosity ratios 0.036 and 1.13, below and above but close to unity. Three weight concentrations 0.5%, 2% and 10% of the block copolymer laying below, close to and above the critical concentration of the total drop surface coverage were examined. Single drop deformation experiments were carried out in a home-designed Couette quartz cell connected to a home-modified Paar Physica Rheometer. The variation in the length-to-diameter ratio (L/D) versus shear rate and capillary number was measured both in steady and in transient regimes till breakup. The results indicated a weaker resistance of copolymer modified drops against hydrodynamic stresses at both viscosity ratios as compared to the clean drop. However, the drop deformation was found to be complex and depends on the copolymer concentration and the viscosity ratio.

Vorheriger Artikel Suspension-like hardening behavior of HDPE and time-hardening superposition

Nächster Artikel Linear and non-linear viscoelastic properties of ethylene vinyl acetate/nano-crystalline cellulose composites

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Titel: Effect of interfacial modifier on single drop deformation and breakup in step increasing shear flow
verfasst von: Foroud Abbassi-Sourki
Mosto Bousmina
Michel A. Huneault
Publikationsdatum: 01.02.2012
Verlag: Springer-Verlag
Erschienen in: Rheologica Acta / Ausgabe 2/2012
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-011-0602-x

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