Thermal and Hydraulic Performances of Nanofluids Flow in Microchannel Heat Sink with Multiple Zigzag Flow Channels

Weerapun Duangthongsuk

doi:10.1051/matecconf/20179503011

Abstract

This article presents an experimental investigation on the heat transfer performance and pressure drop characteristic of two types of nanofluids flowing through microchannel heat sink with multiple zigzag flow channel structures (MZMCHS). SiO 2 nanoparticles dispersed in DI water with concentrations of 0.3 and 0.6 vol.% were used as working fluid. MZMCHS made from copper material with dimension of 28 × 33 mm. Hydraulic diameter of MZMCHs is designed at 1 mm, 7 number of flow channels and heat transfer area is about 1,238 mm 2 . Effects of particle concentration and flow rate on the thermal and hydraulic performances are determined and then compare with the common base fluid. The results indicated that the heat transfer coefficient of nanofluids was higher than that of the water and increased with increasing particle concentration as well as Reynolds number. For pressure drop, the particle concentrations have no significant effect on the pressure drop across the test section.

Highlights

A decade ago, thermal performance of the air-cooled was quite small due to limitation of the thermal performance
The measured data indicated that the surface temperatures of MZMCHS increased with increasing heat load and decrease as particle concentration increased
This mean that nanofluid-cooled microchannel heat sink (MCHS) gave better thermal performance than that of the water-cooled MCHS which led to increase in the heat removal rate from the system

Summary

Introduction

A decade ago, thermal performance of the air-cooled was quite small due to limitation of the thermal performance. Because of the thermal performance of liquid-cooled system are very high compared to the air-cooled system. Improving the thermal performance of the coolants and innovative cooling equipment with special geometric structures were required. Tuckerman and Pease [1] who first introduced the concept of the microchannel heat sink (MCHS) to increase the thermal performance of the cooling system. Masuda and colleges [2] was first to improve the thermal performance of the coolants by using very small solid particles dispersed in the common fluids. Many researchers reported that the thermal performance of nanofluids was higher than the common heat transfer fluids and little penalty drop in pressure [4]-[11]. Nanofluid-cooled heat sink was estimated to be a very effective cooling system for removing high heat densities generated by the modern electronic devices. Effect of particle concentration and flow rate on the heat transfer coefficient and pressure drop are reported

Experimental apparatus

Sample preparation

Data reduction

Results and discussion

Conclusions