Assessment of vortex generator shapes and pin fin perforations for enhancing water-based heat sink performance

Abstract

In this study, two models have been analysed numerically to examine the impact of the geometry and the working fluid under laminar flow on heat and flow characteristics. The first model is a perforated pinned heat sink (PPHS) and the second is a new design of a uniform micro-channel having different shapes of vortex generators (VGs) positioned at intervals along the base of the channel. The VG shapes are circular, triangular and rectangular, and are compared to each other based on constant volume. Models with Reynolds number in the range of 50 to 2300 are subjected to a uniform heat flux relevant to microelectronics air and water cooling. Validations against previous micro-channel studies were conducted using the COMSOL Multiphysics software package and found to be in good agreement. The results show that there is no significant enhancement in heat transfer using water in PPFHS. However, the VGs described here are shown to offer significant potential in combatting the challenges of heat transfer in the technological drive toward lower weight/smaller volume electrical and electronic devices. It is also found that the circular VGs offer the best heat performance among the proposed shapes.

Assessment of vortex generator shapes for enhancing thermohydraulic performance of fluid flow in a channel equipped with perforated chevron plate-fin

“…On the other hand, the HC vortex generator has the lowest values of pressure drop as compared with the other enhanced models particularly at higher Reynolds numbers. This result is consistent with results of Al-Asadi et al (2018) research that showed the circular VG shape has lower pressure drop than symmetric triangular and square models.…”

Do ionic liquids replace water or nanofluids to enhance heat transfer in micro-channel systems?

“…The conjugate heat transfer model and validations against previous studies of the micro-channel is presented as in [1,5,6]. Al2O3 and SiO2 nanoparticles are considered to be separated from each other and well distributed in water as a base fluid at all ranges of concentrations to offer homogeneous nanofluid.…”

“…This brings to fore the need to eliminate the generated heat as it could adversely affect the electronic chip. This can be achieved in a number of ways, using air and waterbase cooled heat sinks [1][2][3][4] and the use of mini-and micro-channel heat exchangers and/or advanced fluids [1,[5][6][7]. Micro-channel design is being modified rapidly to meet the recent improvement in electronic chips and to enhance the heat transfer rate [8].…”

Impact of Twisted Fins on the Overall Performances of a Rectangular-Channel Air-Heat Exchanger

“…Al-Asadi et al [18] explored a novel geometry of VGs to reinforce the 3D conjugate heat transfer of a laminar micro-channel flow by using a CFD technique. Al-Asadi et al [19] also reported another simulation to examine the impact of pin fin perforations under laminar heat transfer flow in heat sinks. Aravind and Deepu [20] enhanced the mass transfer in high-velocity fluid flows by combined lateral sweep VGs and dimple surfaces.…”