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Research Papers: Micro/Nanoscale Heat Transfer

Experimental Study of Thermal Performance of Nanofluid-Filled and Nanoparticles-Coated Mesh Wick Heat Pipes

[+] Author and Article Information
Naveen Kumar Gupta

Department of Mechanical Engineering,
Indian Institute of Technology (ISM),
Dhanbad 826004, India;
Department of Mechanical Engineering,
Institute of Engineering and Technology,
GLA University,
Mathura 281406, India
e-mail: naveen_glau@yahoo.in

Arun Kumar Tiwari

Department of Mechanical Engineering,
Institute of Engineering and
Technology Lucknow,
Lucknow 226021, India

Subrata Kumar Ghosh

Department of Mechanical Engineering,
Indian Institute of Technology (ISM),
Dhanbad 826004, India

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 11, 2017; final manuscript received April 18, 2018; published online June 7, 2018. Assoc. Editor: Ali Khounsary.

J. Heat Transfer 140(10), 102403 (Jun 07, 2018) (7 pages) Paper No: HT-17-1598; doi: 10.1115/1.4040146 History: Received October 11, 2017; Revised April 18, 2018

The enhancements in thermal performance of mesh wick heat pipe (HP) using TiO2/H2O nanofluid (0.5, 1.0, and 1.5 vol %) as working fluid for different (50, 100, and 150 W) power input were investigated. Results showed maximum 17.2% reduction in thermal resistance and maximum 13.4% enhancement in thermal efficiency of HP using 1.0 vol % nanofluid as compared to water. The wick surface of the HP was then coated with TiO2 nanoparticles by physical vapor deposition method. The experimental investigation had been also carried out on coated wick HP using water as working fluid. Results showed 12.1% reduction in thermal resistance and 11.9% enhancement in thermal efficiency of the HP as compared to uncoated wick HP using water. Temporal deteriorations in thermal performance during prolonged working (2, 4, and 6 months) of HP were also studied. Temporal deterioration in thermal performance of HP filled with nanofluid depends upon the deterioration in thermophysical properties of nanofluids. The deterioration is due to the agglomeration and sedimentation of nanoparticles with respect to the time. Comparative study shows that after a certain time of operation, thermal performance of HP with nanoparticle coated wick superseded that of the HP filled with nanofluid. Therefore, nanoparticle coating might be a good substitute for nanofluid to avoid the stability issues. The present paper provides incentives for further research to develop nanofluids that avoid the encountered sedimentation or agglomeration.

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Figures

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Fig. 1

Malvern Zetasizer size distribution image of TiO2 nanoparticles

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Fig. 6

(a) Evaporator thermal resistance and (b) condenser thermal resistance, at different heat inputs

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Fig. 5

Variations of wall temperature along the length of HP (a) 50 W, (b) 100 W, and (c) 150 W

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Fig. 4

Thermocouple locations (in mm) on the wall surface of HP

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Fig. 3

Schematic diagram of the experimental setup

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Fig. 2

Photographic view of the experimental setup

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Fig. 8

UV-vis spectrum of TiO2/H2O nanofluids having different concentrations

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Fig. 7

Variation in thermal efficiency of HP with respect to input power

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Fig. 9

Variation of relative particle concentration with respect to time

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Fig. 10

Temporal deterioration in thermal efficiency of HP with respect to input power

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Fig. 11

FESEM images (a) and (b) of mesh wick surface, before and after using nanofluid for 6 months

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Fig. 12

FESEM images (a) and (b) of coated wick surface, before and after using water for 6 months

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