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research-article

Experimental study of temporal deterioration in 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
naveen_glau@yahoo.in

Arun Kumar Tiwari

Department of Mechanical Engineering, IET Lucknow, India
arun_tiwari25@yahoo.co.in

Subrata Kumar Ghosh

Department of Mechanical Engineering, Indian Institute of Technology (ISM), Dhanbad-826004, India
subratarec@yahoo.co.in

1Corresponding author.

ASME doi:10.1115/1.4040146 History: Received October 11, 2017; Revised April 18, 2018

Abstract

The enhancements in thermal performance of mesh wick heat pipe using TiO2/H2O nanofluid (0.5, 1.0 & 1.5 vol. %) as working fluid for different (50,100, & 150 watts) power input were investigated. Results showed maximum 17.2 % reduction in thermal resistance and maximum 13.4% enhancement in thermal efficiency of heat pipe using 1.0 vol. % nanofluid as compared to water. The wick surface of the heat pipe was then coated with TiO2 nanoparticles by physical vapor deposition method. The experimental investigation had been also carried out on coated wick heat pipe using water as working fluid. Results showed 12.1% reduction in thermal resistance and 11.9% enhancement in thermal efficiency of the heat pipe as compared to uncoated wick heat pipe using water. Temporal deteriorations in thermal performance during prolonged working (2, 4 and 6 months) of heat pipe were also studied. Temporal deterioration in thermal performance of heat pipe 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study shows that after a certain time of operation, thermal performance of heat pipe with nanoparticle coated wick superseded that of the heat pipe filled with nanofluid.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.

Copyright (c) 2018 by ASME
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