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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISSN: 2688-7231 (Online)

Internal Flow Dynamics of Ferrofluid Droplet Under the Influence of Magnetic Field

Sudip Shyam
Department of Mechanical Engineering, Indian Institute of Technology, Guwahati-781039, Assam, India

Balkrishna Mehta
Indian Institute of Technology Kanpur, Kanpur-208016 (U.P.) India; Indian Institute of Technology, Guwahati-781039, Assam, India; Department of Mechanical Engineering, IIT Bhilai

Pranab Kumar Mondal
Indian Institute of Technology, Guwahati-781039, Assam, India

Md Asfer
College of Engineering, University of Shaqra, Saudi Arabia

DOI: 10.1615/IHMTC-2019.900
pages 533-538

要約

Perturbing the ferrofluid droplet domain with a magnetic field can be an effective strategy of augmenting the velocity of the droplet flow field. In the current investigation the ferrofluid droplet domain is disturbed in a time dependent manner by two alternatively operating magnetic field. Bright field visualisation is carried out to observe the motion of the MNP's while micro-particle image velocimetry technique is used for quantification the velocity of the droplet flow field. On actuation of the magnetic field the MNP's were observed to migrate towards the magnet and on reaching the magnetically active zone, the MNP's arranges itself along the magnetic field lines and agglomerates in a chain-like cluster formation. Also the motion of MNP's towards the magnet generates a bulk flow motion in its opposite direction. It was found that in absence of magnetic field the velocity of the droplet flow domain is of the order of 10-6 m/s as opposed to the case when a time dependent magnetic field disturbs the droplet domain, the velocity is of the order of 10-4 m/s. The hydrodynamics of the droplet flow field were found to be governed by the balance between the various involved timescales mainly: - the perturbation time scale, the viscous time scale and the advective time scale. The investigation showed that the maximum disturbances can only be created in the droplet flow domain, when the advective time scale is equal to the perturbation time scales.

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