Direct Numerical Simulation of Ferrofluid Drops in a Cylindrical Microfluidic under the Influence of a Non-uniform Magnetic Field
نویسندگان
چکیده
Ferrofluids are magnetic liquids comprised of magnetic nanoparticles coated with surfactants and suspended in a carrier fluid. With biomedical and pharmaceutical applications in mind, we study the motion and deformation of axisymmetric ferrofluid droplets in the presence of non-uniform magnetic fields. Here we carry out direct numerical simulations of interfacial dynamics of ferrofluid droplet in a cylindrical microfluidic device driven by a magnetic field gradient. The governing equations are the Maxwell equations for a non-conducting flow, momentum equation and incompressibility. The numerical algorithm models the interface between a magnetized fluid and a non-magnetic fluid via a volume-of-fluid framework. A continuum-surfaceforce formulation is used to model the interfacial tension force as a body force, and the placement of the liquids is tracked via a volume fraction function.
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