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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

THERMAL-FLOW CHARACTERISTICS OF FERROFLUID IN THE MICROCHANNEL UNDER EXTERNAL MAGNETIC FORCE

Get access (open in a dialog) DOI: 10.1615/IHTC16.cms.023705
pages 1791-1798

Resumo

As electronic devices become smaller, free convective cooling method, which is circulated and cooled by buoyancy due to heat to lower the competitive price and reduce maintenance costs could be adopted. Recently, ferrofluid, which is attracted attention as a heat dissipation material, is a colloidal solution containing 10 ~ 20 nm sized magnetic particles. When a magnetic field is applied to the ferrofluid, the natural convection and isothermal characteristics are changed due to magnetic body force. In general, thermal-flow characteristics are varied by the external force applied to the ferrofluid due to dielectrophoresis or magnetophoresis force. In this study, behavior of ferrofluids in the microchannel was investigated using the commercial code, COMSOL Multiphysics. Numerical results on the temperature distribution, Nusselt number and magnetophoretic force are obtained and graphically described with different microchannel geometry and flow conditions. Results show that the heat transfer varies with the size of the permanent magnet and the distance of the obstacle within the microchannel. As a result, the average Nusselt number was improved by about 29% compared with the reference model.