Heat dissipation and fluid flow in micro-channel heat sink equipped with semi-elliptical pin-fin structures: A numerical study


Ali N., Srivastava S., Haque I., Yadav J., Alam T., Siddiqui T. U., ...More

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, vol.155, pp.107492, 2024 (SCI-Expanded)

Abstract

Microchannel heat sinks offer efficient heat removal, enhanced heat transfer rates, and precise tem-perature control within chemical reactors. Their compact design, scalability, and ability to maintain tem-perature uniformity throughout the reactor make them valuable tools for optimizing reaction kinetics, product quality, and safety. This investigation presents a new adaptation to traditional microchannel heat sinks (MCHSs) by incorporating semi-elliptical pin-fins (SEPFs) in a symmetrical arrangement within the fluid domain. The focus of the study is on the variation of aspect ratios (Ψ) of the SEPF, which range from 1.00 to 0.36. Numerical simulations are undertaken to assess the thermal and hydraulic efficacy of the al-tered MCHS. The results demonstrate that the decrease in Ψ causes a decline in the formation of the wake region, while also causing a reduction in thermal efficacy as a result of diminished flow disruptions. The inclusion of SEPF results in a notable enhancement in the efficiency of heat transfer (HT) when compared to conventional MCHS, due to the augmented convective surface area. However, the impact of flow disruptions and flow merging outweighs the enhancement in HT. While the use of SEPF enhances thermal efficiency, it is also linked to an increase in pressure drop. A comprehensive assessment of thermohydraulic efficiency demonstrates that SEPF with an aspect ratio (Ψ) of 1.00 displays the most outstanding performance among the various configurations. This study offers valuable insights for optimizing MCHS designs to achieve improved thermal performance while mitigating associated pressure drop effects.