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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, Australia;
Queensland Micro- and Nanotechnology Centre,
Brisbane, QLD 4111, Australia
e-mail: ashkan.vatani@griffithuni.edu.au

Peter Lloyd Woodfield

School of Engineering,
Griffith University,
Gold Coast Campus,
Gold Coast, QLD 4222, Australia

Nam-Trung Nguyen

Queensland Micro- and Nanotechnology Centre,
Brisbane, QLD 4111, Australia

Dzung Viet Dao

School of Engineering,
Griffith University,
Gold Coast Campus,
Gold Coast, QLD 4222, Australia;
Queensland Micro- and Nanotechnology Centre,
Brisbane, QLD 4111, Australia

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received August 23, 2016; final manuscript received May 7, 2017; published online May 23, 2017. Assoc. Editor: Milind A. Jog.

J. Heat Transfer 139(10), 104502 (May 23, 2017) (4 pages) Paper No: HT-16-1533; doi: 10.1115/1.4036688 History: Received August 23, 2016; Revised May 07, 2017

Thermomagnetic convection of a ferrofluid flow induced by the internal magnetic field around a vertical current-carrying wire was theoretically analyzed and experimentally validated for the first time. The Nusselt number for a heated 50-μm diameter wire in a ferrofluid was measured for different electrical currents and fluid temperatures. The experimental results are in a 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.

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Figures

Grahic Jump Location
Fig. 1

Schematic of the induced magnetic field around a current-carrying wire

Grahic Jump Location
Fig. 2

Schematic of the measurement apparatus

Grahic Jump Location
Fig. 3

Transient temperature rise of the wire in de-ionized water (DIW) and ferrofluid (FF) for two different electrical currents (2 A and 3 A) with an initial temperature of 40 °C

Grahic Jump Location
Fig. 4

Maximum Nusselt number for a wire in ferrofluid against current at different initial temperatures

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