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Research Papers

Thermal Performance of an Al2O3–Water Nanofluid Pulsating Heat Pipe

[+] Author and Article Information
Yuwen Zhang

e-mail: zhangyu@missouri.edu
Department of Mechanical and Aerospace Engineering,
University of Missouri,
Columbia, MO 65211

1Corresponding author.

Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received December 8, 2012; final manuscript received March 29, 2013; published online June 4, 2013. Assoc. Editor: Amy Fleischer.

J. Electron. Packag 135(3), 031005 (Jun 04, 2013) (9 pages) Paper No: EP-12-1107; doi: 10.1115/1.4024145 History: Received December 08, 2012; Revised March 29, 2013

A numerical study is performed to investigate the effects of nanofluids on the heat transfer performance of a pulsating heat pipe (PHP). Pure water is employed as the base fluid while Al2O3 with two different particle sizes, 38.4 and 47 nm, is used as nanoparticle. Different parameters including displacement of liquid slug, vapor temperature and pressure, liquid slug temperature distribution, as well as sensible and latent heat transfer in evaporator and condenser are calculated numerically and compared with the ones for pure water as working fluid. The results show that nanofluid has significant effect on heat transfer enhancement of the system and with increasing volume fraction and decreasing particles diameter the enhancement intensifies.

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Figures

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Fig. 2

Effect of nanoparticles on liquid slug displacement for dp = 38.4 nm

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Fig. 3

Effect of nanoparticles on temperature of two vapor plugs for dp = 38.4 nm

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Fig. 4

Effect of nanoparticles on pressure of two vapor plugs for dp = 38.4 nm

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Fig. 13

Effect of nanoparticle size on latent heat of vapor plug 2

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Fig. 12

Effect of nanoparticle size on latent heat vapor plug 1

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Fig. 11

Effect of nanoparticle size on sensible heat of the liquid slug

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Fig. 10

Effect of nanoparticle size on pressure of vapor plugs for volume fraction of 4%

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Fig. 9

Effect of nanoparticle size on temperature of vapor plugs for volume fraction of 4%

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Fig. 8

Effect of nanoparticle size on liquid slug displacement for volume fraction of 4%

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Fig. 7

Effect of nanoparticles on latent heat of vapor plug 2 for different volume fraction at dp = 38.4 nm

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Fig. 6

Effect of nanoparticles on latent heat of vapor plug 1 for different volume fraction at dp = 38.4 nm

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Fig. 5

Effect of nanoparticle on sensible heat transferred into the liquid slug for dp = 38.4 nm

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