Considerable efforts have been spent in the development of magnetic nanoparticles (MNPs) in the last decade to
understand their behaviour, and the improvement of their applicability in many different areas. Precise control over the
synthesis conditions and surface functionalization of MNPs is crucial because it governs their physical properties and
their colloidal stability. The magnetic platforms possess very small size and narrow size distribution together with high
magnetization values. These nanoparticles (NPs) must combine high magnetic susceptibility for an optimum magnetic
enrichment and loss of magnetization after removal of the magnetic field.
Computational Fluid Dynamics (CFD) approach has been used to investigate the impact of a magnetic field in ferrofluid
flow through a T-microchannel. The microchannel consists of one 400μm wide main branch and two 200μm wide sidebranches.
Available experimental data is used to validate the Eulerian-Eulerian approach in simulating the nanoparticles
in flow flow under the influence of magnetic field. In general, magnetic nanoparticles are deflected across the
suspending ferrofluid by negative magnetophoresis and confined by a water flow to the center of the micro-channel. The
effect of ferrofluid flow rate on the particle focusing performance has been examined. It is found that the particle
focusing effectiveness increases with decreasing flow rate.
Experimental investigation and efficient control of magnetorheological (MR) damper towards smart energy absorption of
composite structures are presented in this paper. The evaluation of an existing MR damper based on the damping force
presented in our earlier work is limited by the experiment configuration setup. Using two arms configuration, an
experimental test rig is designed to overcome this limitation and enabled the MR damper to be investigated throughout
its full velocity range capability. A controller is then developed based on the MR damper investigation to provide
automated variable control of induced current with a set crushing force and available data of composite tube crushing
force. The controller is assessed numerically and shows that MR damper is controlled to provide consistent crushing
force despite oscillation from the composite tube crushing force. This, thus, shows promise of MR damper integration
towards smart energy absorption of composite structures.
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