Newtonian drop in a Newtonian matrix subjected to large amplitude oscillatory shear flows

• Published in: Rheologica acta Vol. 43; no. 6; pp. 575 - 583
• Main Authors: GUIDO, Stefano, GROSSO, Massimiliano, MAFFETTONE, Pier Luca
• Format: Journal Article
• Language: English
• Published: Berlin Springer 01-12-2004; Springer Nature B.V
• Subjects: Amplitudes; Drops and bubbles; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Higher harmonics; Non-newtonian fluid flows; Nonhomogeneous flows; Physics; Qualitative analysis; Shear flow; Oscillating flow; Viscoelastic fluid; Geometrical shape; Shear viscosity; Shear flow; Drops; Liquid liquid interface; Experimental study; Forced flow; Rheological properties
• ISSN: 0035-4511; 1435-1528
• DOI: 10.1007/s00397-004-0388-1

The dynamics of a single Newtonian drop immersed in a Newtonian matrix subjected to large-amplitude oscillatory shear flow is investigated. The ratio of the drop and matrix viscosity is above criticality, and thus break-up is absent under constant shear flow. At small forcing amplitudes the drop shape follows a “regular” oscillation. As the forcing amplitude increases, multipeaked oscillations of drop shape and orientation are observed. Experimental results are compared with predictions obtained with a phenomenological model. Model predictions are in qualitative good agreement with experimental data. The model suggests that the appearance of higher harmonics in the drop response is mainly due to flow nonaffinity.