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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

THERMOHYDRODYNAMICS OF FERROFLUIDIC FLOW WITH PERIODIC PULSATION UNDER THE EFFECT OF STATIC AND ALTERNATING MAGNETIC FIELD-: A NUMERICAL STUDY

Get access (open in a dialog) DOI: 10.1615/IHTC16.ctm.023439
pages 3981-3988

要約

Perturbing the periodic pulsatile flow field with a constant and time dependent magnetic field manipulates the momentum and energy exchange process taking place. The present investigation is an effort to study numerically the heat transfer characteristics of pulsating ferrofluidic flow between heated parallel plates under the effect of constant and alternating magnetic field. The flow is both thermally and hydrodynamically developing, while the channel walls are maintained at uniform heated condition. The simulations are performed at Prandtl number (Pr) 5.5, Reynolds number (Re) 93 and for flow frequency of 1-10 Hz and magnetic field frequency of 0-20 Hz. The main objective is to have a proper understanding of the involved physics, when the flow field is perturbed by constant and periodically pulsating external magnetic field. It is found that the changes in the species transport can be highly augmented with help of the external magnetic field. Under the effect of constant magnetic field, the heat transfer enhancement process remains an interplay between the inertia force and the magnetic force, leading to the formation of recirculation zone and its, subsequently clearing off. Whereas under the effect of alternating magnetic field, the individual time scale (such as pulsatile flow time scale (1/ƒ), magnetic field perturbation time scale (1/ƒm), convective time scale, (Lc/uav), etc.) single handedly or in combination plays a pivotal role. It is found that when the external magnetic force perturbs the pulsatile flow field numerous numbers of times for a give cycle, the momentum and thermal energy exchange in the transverse direction gets augmented.