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Technical Brief

Thermomagnetic convection around a current-carrying wire in ferrofluid

[+] Author and Article Information
Ashkan Vatani

School of Engineering, Griffith University, Gold Coast Campus, Gold Coast, QLD 4222, AustraliaQueensland Micro- and Nanotechnology Centre, Brisbane, QLD 4111, Australia
ashkan.vatani@griffithuni.edu.au

Peter Lloyd Woodfield

School of Engineering, Griffith University, Gold Coast Campus, Gold Coast, QLD 4222, Australia
p.woodfield@griffith.edu.au

Nam-Trung Nguyen

Queensland Micro- and Nanotechnology Centre, Brisbane, QLD 4111, Australia
nam-trung.nguyen@griffith.edu.au

Dzung Viet Dao

School of Engineering, Griffith University, Gold Coast Campus, Gold Coast, QLD 4222, AustraliaQueensland Micro- and Nanotechnology Centre, Brisbane, QLD 4111, Australia
d.dao@griffith.edu.au

1Corresponding author.

ASME doi:10.1115/1.4036688 History: Received August 23, 2016; Revised May 07, 2017

Abstract

Thermomagnetic convection of a ferrofluid flow induced by the internal magnetic field around a vertical current-carrying wire was theoretically analysed and experimentally validated for the first time. The Nusselt number for a heated 50-?m diameter wire in a ferrofluid was measured for different electrical currents and fluid temperatures. Experimental results are in good agreement with the proposed scaling analysis. We found that increasing the current will increase the Nusselt number nonlinearly, and ultimately enhances the heat transfer capability of the induced ferrofluid flow. We observed that the thermomagnetic convection becomes dominant, if large enough currents are applied.

Copyright (c) 2017 by ASME
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