Effect of viscosity ratio on the behaviour of ferrofluid droplet emulsions

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Sultan, Ghulam Muhammad Ayaz and Capobianchi, Paolo and Oliveira, Monica (2024) Effect of viscosity ratio on the behaviour of ferrofluid droplet emulsions. In: AERC2024 – Annual European Rheology Conference, April 9-12, 2024, Leeds, UK, 2024-04-09 - 2024-04-12, Leeds.

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Abstract

The behaviour of a ferrofluid droplet in a non-magnetisable immiscible liquid of different viscosity was investigated using a Hybrid Volume of fluid – Level Set approach [1]. We consider the droplet is subjected to simple shear flow and study the effect of viscosity ratio in the presence of magnetic field. The accuracy of the code was first assessed against existing experimental and numerical data in the absence of a magnetic field. We then study the effects produced by a uniform magnetic field applied normal to the flow direction for a range of capillary and Bond numbers. Using the approach of [2], the results are then used to infer the rheology of a dilute emulsion, showing that even relatively small magnetic fields can significantly affect the rheological properties such as the effective viscosity of the emulsion.

ORCID iDs

Sultan, Ghulam Muhammad Ayaz, Capobianchi, Paolo ORCID logoORCID: https://orcid.org/0000-0003-4253-7853 and Oliveira, Monica ORCID logoORCID: https://orcid.org/0000-0002-1836-4692;
CORE (COnnecting REpositories)