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HEAT TRANSFER CHARACTERISTICS OF FERROFLUIDIC FLOW BETWEEN PARALLEL PLATES UNDER THE INFLUENCE OF STATIC AND TRANSIENT MAGNETIC FIELD

Danvendra Singh
Indian Institute of Technology, Guwahati

Sudip Shyam
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

DOI: 10.1615/IHMTC-2017.80
pages 43-48

摘要

Heat transfer characteristics of forced convective flow of ferrofluids between parallel plate, in presence of constant and transient magnetic field is investigated extensively by using commercially available package, COMSOL Multiphysics 5.2a. The heat transfer characteristics is parameterized with the variation of Reynolds number (Re), Magnetic field intensity (B) and frequency of alternating magnetic field (f). Magnetic field is applied perpendicular to the flow direction. By doing so, there will always be spatial distribution of magnetic field which in turn generate the magnetic force field. The interaction between inertia and magnetic forces will govern the flow field which will differ from classical internal laminar flow. The consequence of interaction of the two forces will appear as significant disturbances in the hydrodynamic and thermal boundary layer affecting the transport of heat and momentum. Present study indicated that the heat transfer augmentation is directly influenced by magnetic field intensity, the externally applied frequency of the alternating magnetic field and the flow Reynolds number. The effect of different forces on heat transfer is explained in terms of various time scales, such as advective time scale, perturbation time scale, viscous diffusion time scale and thermal diffusion time scale. These time scales are either individually or in combinations govern the thermo-hydrodynamics of physical phenomenon. The maximum enhancement in heat transfer is found approximately 13.7 % when compared to without magnetic field case for Re=23.6 and B=1 Tesla.

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