Optimization of nanofluid-cooled microchannel heat sink

Abstract

The optimization of a nanofluid-cooled rectangular microchannel heat sink is reported. Two nanofluids with volume fraction of 1 %, 3 %, 5 %, 7 % and 9 % are employed to enhance the overall performance of the system. An optimization scheme is applied consisting of a systematic thermal resistance model as an analysis method and the elitist non-dominated sorting genetic algorithm (NSGA-II). The optimized results showed that the increase in the particles volume fraction results in a decrease in the total thermal resistance and an increase in the pumping power. For volume fractions of 1 %, 3 %, 5 %, 7 % and 9 %, the thermal resistances were 0.072, 0.07151, 0.07075, 0.07024 and 0.070 [oK W-1] for the SiC-H2O while, they were 0.0705, 0.0697, 0.0694, 0.0692 and 0.069 [oK W-1] for the TiO2-H2O. The associated pumping power were 0.633, 0.638, 0.704, 0.757 and 0.807 [W] for the SiC-H2O while they were 0.645, 0.675, 0.724, 0.755 and 0.798 [W] for the TiO2-H2O. In addition, for the same operating conditions, the nanofluid-cooled system outperformed the water-cooled system in terms of the total thermal resistance (0.069 and 0.11 for nanofluid-cooled and water-cooled systems, respectively). Based on the results observed in this study, nanofluids should be considered as the future coolant for electronic devices cooling systems.

Improving thermal performance of micro-channel electronic heat sink using supercritical CO2 as coolant

“…A pump is used to maintain required pressure rise for flow through MCHS -heat exchanger system. Single layered MCHS structure [14] is considered in this study and supercritical CO 2 is proposed as a coolant. As the main aim of this study to promote supercritical CO 2 as coolant in MCHS, the performance of MCHS using supercritical CO 2 has been only studied.…”

“…Apart from this, ethylene glycol-water brine, methanol-water mixture, FC-72, etc., were also proposed. Recently, nanofluids also have been proposed as heat transfer fluid and lots of numerical and experimental works for nanofluid-cooled MCHS have been conducted [8][9][10][11][12][13][14]. In the present study, supercritical CO 2 is being proposed as a heat transfer fluid in MCHS for electronics cooling.…”

Thermal and hydrodynamic performance of a microchannel heat sink with carbon nanotube nanofluids

“…The thermal conductivity and heat capacity -two properties responsible towards a coolant ability to remove heat -of air, water, and refrigerants could be manipulated through the addition of moisture in the case of gas, and particles for the liquids. The latter has become the trending coolant with continuous studies into different particles with various concentrations dispersed in various base fluids [23,24,25]. The enhanced heat transfer attainable with nanofluids have made them as a popular choice of coolants [26], as also evidenced in some of the previous references.…”

Performance Characteristics of Divergence Micro-Channels Heat Sink Using Nanofluids.

“…Rectangular microchannel heat sink studied by Adham et al (2016) [11] using nanofluid as working fluid. They used SiC-HO and TiO 2 -H 2 O with particles concentrations of 1%, 3%, 5%, 7% and 9% to improved heat sink performance using thermal resistance method with genetic algorithm.…”

“…The nano properties (the density, specific heat, viscosity and thermal conductivity) that required for flow were calculated using the following equations [11]: The density:…”