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Technical Briefs

Enhanced Critical Heat Flux During Quenching of Extremely Dilute Aqueous Colloidal Suspensions With Graphene Oxide Nanosheets

[+] Author and Article Information
Zitao Yu

e-mail: yuzitao@zju.edu.cn

Danyang Li, Yacai Hu

Institute of Thermal Science and Power Systems,
Department of Energy Engineering,
Zhejiang University,
Hangzhou 310027, PRC

Liwu Fan

Institute of Thermal Science and Power Systems,
Department of Energy Engineering,
Zhejiang University,
Hangzhou 310027, PRC;
State Key Laboratory of Clean Energy Utilization,
Department of Energy Engineering,
Zhejiang University,Hangzhou 310027, PRC
e-mail: liwufan@zju.edu.cn

Kefa Cen

State Key Laboratory of Clean Energy Utilization,
Department of Energy Engineering,
Zhejiang University,
Hangzhou 310027, PRC

1Corresponding authors.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received April 25, 2012; final manuscript received December 19, 2012; published online April 9, 2013. Assoc. Editor: Louis C. Chow.

J. Heat Transfer 135(5), 054502 (Apr 09, 2013) (5 pages) Paper No: HT-12-1193; doi: 10.1115/1.4023304 History: Received April 25, 2012; Revised December 19, 2012

In this Technical Brief, we report on preliminary results of an experimental investigation of quenching of aqueous colloidal suspensions with graphene oxide nanosheets (GONs). Extremely dilute suspensions with only 0.0001% and 0.0002% (in mass fraction) of GONs were studied and their critical heat fluxes (CHF) during quenching were determined to increase markedly by 13.2% and 25.0%, respectively, as compared to that of pure water. Such efficient CHF enhancement was interpreted to be caused primarily by the improved wettability of the quenched surfaces, due to deposition of the fish-scale-shaped GONs resulting in self-assembly quasi-ordered microscale morphologies.

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Figures

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Fig. 1

TEM images of (a) a group of suspended GONs and (b) an individual GON (close-up view) in the aqueous GON dispersion (1 wt. %) as received

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Fig. 2

Comparison of the boiling curves (heat flux versus wall superheat) for the second quenching runs of pure water and aqueous GON nanofluids at the two dilute concentrations

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Fig. 3

Images representing the measured static contact angles of pure water on (a) the original nickel-plated surface and the surfaces quenched in the aqueous nanofluids of (b) 0.0001 wt. % and (c) 0.0002 wt. % of GONs, and (d) comparison of the averaged static contact angles. The insets in (b) and (c) illustrate the suspensions as prepared (left) and after quenching (right).

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Fig. 4

SEM images showing the morphologies of (a) the original nickel-plated surface and the surfaces quenched in the aqueous nanofluids of (b) 0.0001 wt. %, (c) 0.0002 wt. %, and (d) 0.0002 wt. % (at a higher magnification) of GONs

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