Experimental Study of Al2O3 Nanofluids on the Thermal Efficiency of Curved Heat Pipe at Different Tilt Angle

S Razvarz,R Jafari

doi:10.1155/2018/1591247

Abstract

This paper represents an experimental study about the effect of curves related to thermosyphons and heat pipes with different active fluids and inclination angle at the thermal efficiency. The nanofluid utilized in this work is an aqueous soluble of Al2O3 nanoparticles with 35 nm diameter in pure water. The test saturation level of nanoparticles is 0%, 1%, and 3%wt. All the experiments were conducted and repeated at inclination angle of 30°, 60°, and 90° (vertical). The article presents the gravity impacts on the heat transfer characteristics in different angles and the effects of working fluids and tilt angle of heat pipe tube by the addition of nanoparticles and weight fractions on the thermal efficiency of heat pipe at different inclination. According to the experimental results, the heat pipe at the tilt angle of 60° generates the superior results. At a particle volume concentration of 1%, the use of Al2O3/water nanofluid gives significantly higher heat transfer.

Highlights

The problem of heat dissipation from the electronic equipment is taken into consideration by using a new heat transfer devices such as heat pipe
This paper presents the study on heat transfer in the curved heat pipe in an adiabatic section and the effect of heat pipe tilt angle that have rarely been reported
The base working fluid is pure water in this experiment, and Al2O3 nanoparticles are the most common nanoparticles used with 30 nm and 45 nm in size measured by transmission electron microscopy (TEM)

Summary

Introduction

The problem of heat dissipation from the electronic equipment is taken into consideration by using a new heat transfer devices such as heat pipe. Moraveji and Razvarz [21] investigated on the outcome of Al2O3 nanofluids related to the thermal performance of the heat pipe; they demonstrated that more nanoparticles will cause a better performance in the heat pipe. Their results indicate that increasing the nanoparticle concentration and temperature could enhance the convective heat transfer coefficient of nanofluid. Asirvatham et al [23] studied silver nanoparticles by dispersing in deionized water to improve heat transfer performance of a heat pipe. The results of this paper will be helpful in logical choice of acceptable percentage of nanoparticle in heat transfer

Experimental Setup and Procedure

Results and Discussion

Conclusions