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research-article

Experimental investigations on the thermal performance of a single closed loop pulsating heat pipe using TiO2 Nano fluid

[+] Author and Article Information
Pradeep GV

Jain University, Department of Mechanical Engineering, Bangalore-562112, India
pradeep_gv99@yahoo.com

K Rama Narasimha

K S Institute of Technology, Department of Mechanical Engineering, Bangalore-560062, India
k.ramanarasimha@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4041953 History: Received September 10, 2018; Revised November 07, 2018

Abstract

This paper describes the experimental investigations conducted on a closed loop pulsating heat pipe (CLPHP) for assessing the thermal performance. The pulsating heat pipe has a single closed loop made of copper. The working fluids used are water and titanium-di-oxide nano fluids with varying concentrations of TiO2 nano particles (1.5% and 1%) on weight basis. The TiO2 particles are mixed in water to form a stable suspension using a sonicator. The heat input is varied between 40W-100W in steps of 20W. All experiments are conducted in the bottom heating mode (evaporator at the top) in vertical and horizontal orientations. The parameters considered for evaluating the thermal performance are the temperature difference between evaporator and condenser, thermal resistance, heat transfer coefficient and thermal conductivity. The results of the investigation reveals that, the vertical orientation and increase in nano particle concentration favors better heat transfer performance of the PHP

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