Shear thickening of dilute suspensions of fractal silica aggregates

Barik, S and Bera, PK and Sood, AK and Majumdar, S (2024) Shear thickening of dilute suspensions of fractal silica aggregates. In: Journal of Non-Newtonian Fluid Mechanics, 328 .

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Abstract

The increase in viscosity under shear known as shear thickening (ST) is an inherent property of a wide variety of dense particulate suspensions. Recent studies indicate that ST systems formed by fractal particles are promising candidates for various practical applications. However, ST in fractal systems remains poorly explored. Here we experimentally study the ST behavior in suspensions of hydrophilic fumed silica (FS) particles in glycerol. Remarkably, unlike non-fractal systems, we observe a strong dependence of the onset stress for ST on the volume fraction of fractal objects and a reversible weakening of the ST response that depends strongly on the particle volume fraction as well as the properties of the FS system. Using in-situ boundary imaging, we map out the spatio-temporal flow properties during ST for different FS systems. We find that the fractal nature and structural properties like the internal branching of the particles can qualitatively explain the complex ST phase diagram of these systems. © 2024

Item Type:	Journal Article
Publication:	Journal of Non-Newtonian Fluid Mechanics
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Non Newtonian flow; Non Newtonian liquids; Rheology; Silica; Suspensions (fluids); Volume fraction, Dense particulate suspensions; Dilute suspensions; Fractal particles; Fractal suspension; Fractal systems; Fumed silicas; Non-Newtonian fluids; Property; Shear thickening; Thickening systems, Fractals
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	29 May 2024 07:14
Last Modified:	29 May 2024 07:14
URI:	https://eprints.iisc.ac.in/id/eprint/85018

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