Performance of TiO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; Nanofluid and DI Water Filled Flat Type Heat Pipe (FTHP) Internally Grooved at Various Fill Ratios and Inclinations

Alagappan Narayanan

doi:10.11648/j.ajmie.20180304.11

Abstract

Heat pipe operates, with a metallic wick (or grooved) installed inside the pipe, containing fluid under a pressure which permits evaporated vapour at the hot side to fill the core of the pipe and travel to the cooled side. The vapour condenses at cold side, transporting heat by this method. This study focuses on the heat transfer performance of flat type internally grooved heat pipe with two different working fluids DI water and TiO2 nano fluid, used with various heat input (50, 60, 70 and 80W) and at two different orientation 45deg and 90deg of the pipe. The fill ratio used was 50% and 70%, concentration and the size of the nano particle were 80 mg/lit and 30 nm respectively. In this setup, the condenser section of the Flat Type Heat Pipe (FTHP) was cooled by rectangular aluminum fins. The result shows that the decisive factors of FTHP are the working fluids, internal grooves and inclination angle. The relatively high rate of heat transfer was achieved while using TiO2 nano fluid at 90deg orientation with a fill ratio of 50% compared to FTHP with DI water.

Highlights

Heat pipes are very effective heat transfer devices employed to transmit large quantities of heat through a small cross-sectional area over a considerable distance with no additional power input to the system
The high range [300 to 7000 Btu/hr-ft2°F] of heat transfer was achieved in the evaporator section by using internally grooved heat pipe was reported by Carnavos [26]
In order to study the effect of% charged value of working fluid on thermal resistance of Flat Type Heat Pipe (FTHP), in a different heat input, here heat pipe was charged with two different working fluids were DI water and TiO2 nano fluid in two different quantities 50% and 70% of fill ratio

Summary

Introduction

Heat pipes are very effective heat transfer devices employed to transmit large quantities of heat through a small cross-sectional area over a considerable distance with no additional power input to the system. They are capable of controlling and transporting large quantities of heat at various temperature levels. It has been clearly demonstrated that the flatshaped heat pipes [13,14,15,16,17,18] have an advantage in terms of heat removal capability and geometrical adaption for many applications such as electronic cooling, space craft thermal control and commercial thermal applications

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Conclusion