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Research Papers

Experimental Investigation of Magnetic Field Effect on the Magnetic Nanofluid Oscillating Heat Pipe

[+] Author and Article Information
Dianli Zhao

Institute of Marine Engineering and Thermal Science,
College of Marine Engineering,
Dalian Maritime University,
Dalian 116026, China

Hongbin Ma

LaPierre Professor
Fellow ASME
Department of Mechanical & Aerospace Engineering,
University of Missouri,
Columbia, MO 65211
e-mail: mah@missouri.edu

1Corresponding author.

Manuscript received February 22, 2012; final manuscript received August 16, 2012; published online February 22, 2013. Assoc. Editor: Jovica R. Riznic.

J. Thermal Sci. Eng. Appl 5(1), 011005 (Feb 22, 2013) (5 pages) Paper No: TSEA-12-1032; doi: 10.1115/1.4007498 History: Received February 22, 2012; Revised August 16, 2012

The magnetic field effect on oscillating motion and heat transfer in an oscillating heat pipe (OHP) containing magnetic nanofluid was investigated experimentally. The nanofluid consisted of distilled water and dysprosium (III) oxide nanoparticles with an average size of 98 nm. A magnetic field was applied to the evaporating section of the OHP by using a permanent magnet. The heat pipes charged with magnetic nanofluids at mass ratios of 0.1%, 0.05%, and 0.01% were tested. In addition, the effects of orientation and input power ranging from 50 W to 250 W on the heat transport capability of the heat pipe were investigated. The experimental results demonstrate that the magnetic field can affect the oscillating motions and enhance the heat transfer performance of the magnetic nanofluid OHP. The magnetic nanoparticles in a magnetic field can reduce the startup power of oscillating motion and enhance the heat transfer performance.

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Figures

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Fig. 6

Oscillating temperature of the magnetic nanofluid OHP without magnet (magnetic particles: Dy2O3; mass ratio: 0.01%; orientation: vertical; power input: 50 W)

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Fig. 7

Oscillating temperature of the magnetic nanofluid OHP with magnet (magnetic particles: Dy2O3; mass ratio: 0.01%; orientation: vertical; power input: 50 W)

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Fig. 8

Oscillating temperature of the magnetic nanofluid OHP without magnet (magnetic particles: Dy2O3; mass ratio: 0.01%; orientation: vertical; power input: 250 W)

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Fig. 9

Oscillating temperature of the magnetic nanofluid OHP with magnet (magnetic particles: Dy2O3; mass ratio: 0.01%; orientation: vertical; power input: 250 W)

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Fig. 10

Orientation effect on the thermal resistance of magnetic nanofluid OHP at a mass ratio of 0.01% (magnetic nanoparticles: Dy2O3; operating temperature: 20 °C)

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Fig. 11

Orientation effect on the thermal resistance of magnetic nanofluid OHP at a mass ratio of 0.05% (magnetic nanoparticles: Dy2O3; operating temperature: 20 °C)

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Fig. 12

Orientation effect on the thermal resistance of magnetic nanofluid OHP at a mass ratio of 0.1% (magnetic nanoparticles: Dy2O3; operating temperature: 20 °C)

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Fig. 5

Magnetic nanoparticle effect on the thermal resistance with and without magnetic field (magnetic nanoparticles: Dy2O3; mass ratio: 0.01%; operating temperature: 20 °C; base fluid: distilled water)

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Fig. 4

Experimental system

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Fig. 3

TEM image of dysprosium (III) oxide nanoparticles

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Fig. 2

Thermocouple locations

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Fig. 1

Experimental heat pipe and dimensioned drawing: (a) photo (b) dimensions (cm)

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