Abstract
In this paper, we numerically study the influence of the addition of parallelogram ribs and pie-shaped ribs in micro-channels on thermal exchange in three dimensions. We design four different silicon micro-channel heat sinks; the first and second cases without ribs, the third case with added pie-shaped ribs, and a fourth case containing parallelogram ribs. The main purpose of this research is to determine the best micro-channel heat sink in which the heat dissipation is sufficient to improve the heat exchange performance of the micro-channel, as well as to improve the cooling of the electronic components. A constant heat flux is applied to the bottom wall of the four micro-channels, and we use liquid diamond-water with a volume concentration of 5% diamond nanoparticles as a coolant, with a Reynolds number chosen between 200 and 600. The numerical results show that the Nusselt number (Nu) of the micro-channel that contains the parallelogram ribs is higher than that for the other cases, and it also yiels lower temperature values on the bottom wall of the substrate compared to the micro-channel containing pie ribs. When increasing the flow velocity, the thermal resistance of the micro-channel decreases in all cases, and we then find the largest value of the friction factor in the fourth case (with parallelogram ribs).
Highlights
The field of electronics has witnessed remarkable developments recently
The results show that the flow velocity increases and the temperature values of the heated bottom wall decrease in all cases
We found that the lowest temperature values were obtained with the micro-channel containing the parallelogram ribs
Summary
The field of electronics has witnessed remarkable developments recently. The tremendous proliferation of electronic devices made possible by the miniaturization of electronic components and increased operating performance has led to high-temperature problems. Safaei et al [9] examined the mixed convection heat transfer of various water and copper nanofluids through an inclined ribbed micro-channel using the finite volume method for a Reynolds number of 50, inclination angles ranging from 0° to 90°, and nanoparticle size fractions from 0.0 to 0.04 They studied the effect of nanoparticle volume concentration, inclination angle, buoyancy and shear forces, and rib shape on the hydraulics and thermal behavior of nanofluid flow. Their results showed that the use of nanofluids, ribs, and secondary channels in the micro-channel greatly improved the performance of the heat sink They confirmed that increasing the volume concentration and Reynolds number helped to decrease the temperature and improved the average heat transfer coefficient with convection. A conclusion summarizing the main results is given at the end of this article, with some recommendations for future studies
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