Benefits of spanwise gaps in cylindrical vortex generators for conjugate heat transfer enhancement in micro-channels

Abstract

Benefits of spanwise gaps in cylindrical vortex generators for conjugate heat transfer enhancement in micro-channels.

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].…”

Management of conjugate heat transfer using various arrangements of cylindrical vortex generators in micro-channels

“…The goal of a VG is to disturb the flow in the channel to improve heat transfer performance. The disturbed flow will create vortices which can be categorised into transverse and longitudinal vortices [23,24]. A transverse vortex has its rotation axis at a right angle to the direction of flow and a longitudinal vortex has it parallel to the direction of flow [25][26][27][28][29].…”

“…The half-circle VG resulted in lower pressure drop compared to the quarter-circle VG. Moreover, Al-Asadi et al [23] thoroughly studied three different models of placing the VG for full span, centred and split configurations. The results showed that the centred VG offered better heat transfer improvement compared to the other two models with an optimum number of VGs (5 circular VGs).…”

“…Thus, the literature has shown a gap of knowledge in how to enhance the heat transfer in microchannel heat sinks (MCHSs) while controlling the increase in pressure drop. This point has motivated researchers to propose novel ways in which heat transfer can be enhanced while trying to reduce the increase in pressure drop and one promising alternative is to employ cylindrical vortex generators (VGs) [23]. To the best of the authors' knowledge, there is currently a significant knowledge gap on how VGs distribution can be used to provide effective thermal management by enhancing heat transfer while controlling the increase in pressure drop.…”