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Research Papers: Forced Convection

Thermal-Hydraulic Performance of SiC-Water and Al2O3-Water Nanofluids in the Minichannel

[+] Author and Article Information
Ji Zhang

The Department of Building Environment
and Facility Engineering,
The College of Architecture
and Civil Engineering,
Beijing University of Technology,
No. 100 Pingleyuan,
Chaoyang District,
Beijing 100124, China

Yanhua Diao

The Department of Building
Environment and Facility Engineering,
The College of Architecture
and Civil Engineering,
Beijing University of Technology,
No. 100 Pingleyuan,
Chaoyang District,
Beijing 100124, China
e-mail: diaoyanhua@bjut.edu.cn

Yaohua Zhao, Yanni Zhang

The Department of Building
Environment and Facility Engineering,
The College of Architecture
and Civil Engineering,
Beijing University of Technology,
No. 100 Pingleyuan,
Chaoyang District,
Beijing 100124, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 13, 2014; final manuscript received August 5, 2015; published online October 21, 2015. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 138(2), 021705 (Oct 21, 2015) (9 pages) Paper No: HT-14-1736; doi: 10.1115/1.4031699 History: Received November 13, 2014; Revised August 05, 2015

The single-phase flow and heat transfer behaviors of SiC and Al2O3 nanoparticles dispersed in water were studied experimentally in a multiport minichannel flat tube (MMFT). The volume concentrations of the two nanofluids ranged from 0.001% to 1%. Their effective particle sizes, thermal conductivities, and viscosities were also measured. Results indicated that these nanofluids as a working fluid could enhance heat transfer but increase pressure drop and the Nusselt number by up to 85%. The two nanofluids exhibited a common optimal volume concentration of 0.01% for heat transfer. Effective particle size was also found to have a significant effect on heat transfer.

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Figures

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Fig. 1

SEM images of SiC and Al2O3 nanoparticles (φ = 0.1%)

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Fig. 2

DLS measurement of effective particle size (φ = 0.1%)

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Fig. 3

Effective thermal conductivity of nanofluid at 0.1% volume concentration at various temperatures (error bar ± 5%)

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Fig. 4

Effective viscosity of nanofluid at various volume concentrations (error bar ±5%)

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Fig. 5

Schematic of test section

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Fig. 6

Schematic of test system

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Fig. 7

Friction factor versus Re (water)

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Fig. 8

Average Nu versus Re (water)

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Fig. 9

Friction factor versus Re for nanofluids

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Fig. 10

Nu versus Re for nanofluids

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Fig. 11

Comparison of averaged Nu of SiC-water and Al2O3-water nanofluids at φ = 0.001%

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Fig. 12

PEC versus Re for nanofluids

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