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Research Papers

Heat Transfer Enhancement by Sinusoidal Motion of a Water-Based Nanofluid

[+] Author and Article Information
Omer F. Guler

Department of Mechanical Engineering,
TOBB University of Economics and Technology,
Sogutozu Cad. No: 43,
Ankara 06560, Turkey
e-mail: oguler@etu.edu.tr

Oguz Guven

Department of Mechanical Engineering,
TOBB University of Economics and Technology,
Sogutozu Cad. No: 43,
Ankara 06560, Turkey
e-mail: oguven@etu.edu.tr

Murat K. Aktas

Department of Mechanical Engineering,
TOBB University of Economics and Technology,
Sogutozu Cad. No: 43,
Ankara 06560, Turkey
e-mail: maktas@etu.edu.tr

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received April 20, 2018; final manuscript received October 20, 2018; published online March 25, 2019. Assoc. Editor: T. S. Ravigururajan.

J. Thermal Sci. Eng. Appl 11(4), 041001 (Mar 25, 2019) (11 pages) Paper No: TSEA-18-1201; doi: 10.1115/1.4041877 History: Received April 20, 2018; Revised October 20, 2018

The oscillatory flows are often utilized in order to augment heat transfer rates in various industrial processes. It is also a well-known fact that nanofluids provide significant enhancement in heat transfer at certain conditions. In this research, heat transfer in an oscillatory pipe flow of both water and water–alumina nanofluid was studied experimentally under low frequency regime laminar flow conditions. The experimental apparatus consists of a capillary tube bundle connecting two reservoirs, which are placed at the top and the bottom ends of the capillary tube bundle. The upper reservoir is filled with the hot fluid while the lower reservoir and the capillary tube bundle are filled with the cold fluid. The oscillatory flow in the tube bundle is driven by the periodic vibrations of a surface mounted on the bottom end of the cold reservoir. The effects of the frequency and the maximum displacement amplitude of the vibrations on thermal convection were quantified based on the measured temperature and acceleration data. It is found that the instantaneous heat transfer rate between de-ionized (DI) water (or the nanofluid)-filled reservoirs is proportional to the exciter displacement. Significantly reduced maximum heat transfer rates and effective thermal diffusivities are obtained for larger capillary tubes. The nanofluid utilized oscillation control heat transport tubes achieve high heat transfer rates. However, heat transfer effectiveness of such systems is relatively lower compared to DI water filled tubes.

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Figures

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Fig. 1

The experimental apparatus

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Fig. 2

The schematic of the slip-flow model describing the thermal characteristics in the oscillation controlled heat transport tubes

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Fig. 3

Temporal (a) pressure and (b) temperature variations in DI water (f = 5 Hz, ΔS = 9.1 mm)

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Fig. 4

Effective thermal diffusivity as a function of tidal displacement at various frequencies in DI water

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Fig. 5

Effective thermal diffusivity as a function of exciter displacement in DI water at various excitation frequencies

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Fig. 6

Temporal variation of heat transfer at 5 Hz for different exciter displacements

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Fig. 7

Effective thermal diffusivity as a function of tube diameter at various frequencies in DI water

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Fig. 8

Total heat transfer as a function of diaphragm displacement and capillary tube size in DI water

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Fig. 9

Variation of the heat transfer effectiveness with excitation frequency in DI water (a = 1.5 mm)

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Fig. 10

Temporal variation of heat transfer in nanofluid for different exciter displacements at (a) f = 5 Hz and (b) f = 7 Hz

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Fig. 11

Total heat transfer as a function of diaphragm displacement in nanofluid at various excitation frequencies

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Fig. 12

Effective thermal diffusivity as a function of exciter displacement and power setting in nanofluid at (a) 5 Hz and (b) 8 Hz

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Fig. 13

Total heat transfer as a function of diaphragm displacement and capillary tube size in nanofluid media (f = 5 Hz)

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Fig. 14

Effective Prandtl number as a function of exciter displacement and frequency in (a) smaller capillary tubes and (b) larger capillary tubes

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Fig. 15

Heat transfer effectiveness in DI water and in the nanofluid

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