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Research Papers: Nuclear Power

Boiling Heat Transfer and Critical Heat Flux Enhancement of Upward- and Downward-Facing Heater in Nanofluids

[+] Author and Article Information
Muhamad Zuhairi Sulaiman

Energy and Environment Laboratory,
Department of Mechanical Engineering & Intelligent Systems,
The University of Electro-Communications,
1-5-1, Chofugaoka, Chofu-shi,
Tokyo 182-8585, Japan
e-mail: zuhairi@ump.edu.my

Masahiro Takamura

e-mail: takamura@ihmt.mech.eng.osaka-u.ac.jp

Kazuki Nakahashi

e-mail: nakahashi@ihmt.mech.eng.osaka-u.ac.jp
Department of Mechanical Engineering,
Osaka University, 2-1 Yamadaoka,
Suita-shi, Osaka 565-0871, Japan

Tomio Okawa

Energy and Environment Laboratory,
Department Mechanical Engineering & Intelligent Systems,
The University of Electro-Communications,
1-5-1, Chofugaoka, Chofu-shi,
Tokyo 182-8585, Japan
e-mail: okawa.tomio@uec.ac.jp

1Corresponding author.

Contributed by the Power Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 18, 2012; final manuscript received October 26, 2012; published online June 12, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(7), 072901 (Jun 12, 2013) (6 pages) Paper No: GTP-12-1411; doi: 10.1115/1.4023688 History: Received October 18, 2012; Revised October 26, 2012

Boiling heat transfer (BHT) and critical heat flux (CHF) performance were experimentally studied for saturated pool boiling of water-based nanofluids. In present experimental works, copper heaters of 20 mm diameter with titanium-oxide (TiO2) nanocoated surface were produced in pool boiling of nanofluid. Experiments were performed in both upward and downward facing nanofluid coated heater surface. TiO2 nanoparticle was used with concentration ranging from 0.004 until 0.4 kg/m3 and boiling time of tb = 1, 3, 10, 20, 40, and 60 mins. Distilled water was used to observed BHT and CHF performance of different nanofluids boiling time and concentration configurations. Nucleate boiling heat transfer observed to deteriorate in upward facing heater, however; in contrast effect of enhancement for downward. Maximum enhancements of CHF for upward- and downward-facing heater are 2.1 and 1.9 times, respectively. Reduction of mean contact angle demonstrate enhancement on the critical heat flux for both upward-facing and downward-facing heater configuration. However, nucleate boiling heat transfer shows inconsistency in similar concentration with sequence of boiling time. For both downward- and upward-facing nanocoated heater's BHT and CHF, the optimum configuration denotes by C = 400 kg/m3 with tb = 1 min which shows the best increment of boiling curve trend with lowest wall superheat ΔT = 25 K and critical heat flux enhancement of 2.02 times.

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Figures

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Fig. 1

Schematic diagram of the experimental apparatus (upward-facing heater)

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Fig. 2

Dependence of the critical heat flux on the boiling time in nanofluids between upward-facing and downward-facing heaters (qw = 330 kw/m2)

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Fig. 3

Relationship between the critical heat flux and the mean static contact angle for upward-facing and downward-facing heater (qw = 330 kw/m2)

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Fig. 4

Boiling curve for upward-facing heater in pure water and TiO2 nanofluids coated heater with C = 0.004 kg/m3 and tb = 1, 3, 10, 20, 40 and 60 mins

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Fig. 5

Boiling curve for upward-facing heater in pure water and TiO2 nanofluids coated heater with C = 0.040 kg/m3 and tb = 1, 3, 10, 20, 40 and 60 mins

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Fig. 6

Boiling curve for upward-facing heater in pure water and TiO2 nanofluids coated heater with C = 0.400 kg/m3 and tb = 1, 3, 10, 20, 40 and 60 mins

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Fig. 7

Boiling curve for downward-facing heater in pure water and TiO2 nanofluids coated heater with C = 0.004 kg/m3 and tb = 1, 3, 10, 20, 40 and 60 mins

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Fig. 8

Boiling curve for downward-facing heater in pure water and TiO2 nanofluids coated heater with C = 0.040 kg/m3 and tb = 1, 3, 10, 20, 40 and 60 mins

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Fig. 9

Boiling curve for downward-facing heater in pure water and TiO2 nanofluids coated heater with C = 0.4 kg/m3 and tb = 1, 3, 10, 20, 40 and 60 mins

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Fig. 10

Boiling curve for upward and downward-facing heater in pure water and TiO2 nanofluids coated heater with C = 0.004 kg/m3 and tb = 20 mins

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Fig. 11

Boiling curve for upward and downward-facing heater in pure water and TiO2 nanofluids coated heater with C = 0.040 kg/m3 and tb = 20 mins

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Fig. 12

Boiling curve for upward and downward-facing heater in pure water and TiO2 nanofluids coated heater with C = 0.400 kg/m3 and tb = 20 mins

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