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THERMOMAGNETIC CONVECTION OF FERROFLUID IN NON-UNIFORM MAGNETIC FIELD ARROUND A CURRENT CARRYING WIRE

DOI: 10.1615/ICHMT.2017.CHT-7.90
pages 59-64

Ashkan Vatani
School of engineering, Griffith University, Gold Coast, Australia, 4222; Queensland Micro and Nanotechnology center, Brisbane, Australia

Peter Woodfield
School of engineering, Griffith University, Gold Coast, Australia, 4222

Nam-Trung Nguyen
Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessels Road, Brisbane QLD 4111, Australia

D. Dao
School of engineering, Griffith University, Gold Coast, Australia, 4222; Queensland Micro and Nanotechnology center, Brisbane, Australia

Abstract

In this paper, the induced thermomagnetic convection of a dilute ferrofluid in a non-uniform magnetic field induced around a current-carrying wire was theoretically studied, experimentally tested and numerically validated. The temperature rise of the hot wire has been measured for different currents applied to the wire. The velocity and temperature profiles have been numerically studied and compared for the cases of free convection only, and free convection accompanied by thermomagnetic convection. Results revealed that at low currents the effect of thermomagnetic convection is insignificant, while at higher currents it becomes dominant and higher heat transfer coefficients with enhanced cooling effect are achievable. This phenomenon in larger scale can minimize the need for pumping power in cooling applications.

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