Shape Optimization of Micro-Channel Heat Sink for Micro-Electronic Cooling

Numerical Heat Transfer, Part A: Applications

Meyer

Ighalo

2010

Section: Resultssupporting

confidence: 90%

Combined Numerical Optimization and Constructal Theory for the Design of Microchannel Heat Sinks

Numerical Heat Transfer, Part A: Applications

Meyer

Ighalo

2010

“…Husain and Kim [12] also carried out a numerical investigation of 3D fluid flow and heat transfer in a rectangular microchannel using water as a cooling fluid in a silicon substrate.…”

Section: Introductionmentioning

confidence: 99%

Constructal design of combined microchannel and micro pin fins for electronic cooling

Adewumi

International Journal of Heat and Mass Transfer

Meyer

2013

This paper presents a three-dimensional numerical study of steady, laminar, incompressible flow and forced convection heat transfer through a microchannel heat sink with micro pin fin inserts for both fixed and variable axial lengths. The objective of the study was to optimise the geometric configuration of an integrated microchannel and micro pin fins for different solid volumes so that the peak temperature in the configuration was minimised. The effect of the micro pin fins on the optimised microchannel was also investigated. The geometric optimisation of the integrated microchannel and micro pin fin was carried out using a computational fluid dynamics (CFD) code with a goal-driven optimisation tool subject to global constraints. The optimisation procedure was carried out in two steps. Firstly, the microchannel configuration was optimised without the micro pin fins inserted and the results were compared with similar work found in the open literature. This optimisation was carried out for both fixed and relaxed lengths. Thereafter, the integrated design of the microchannel and micro pin fins was optimised. The effect of the Bejan number on the solid volume fraction, channel aspect ratio and hydraulic diameter, pin fin aspect ratio, minimised peak temperature and maximized thermal conductance were reported. Results showed that as the Bejan number increased, the minimised peak temperature decreased. Also, the maximum thermal conductance increased with the optimised microchannel structure with three to six rows of micro pin fin inserts. Diminishing return set in when the number of rows of micro pin fin inserts was greater than three for the fixed length but for the relaxed length, as the number of rows increased, the results improved but when it exceeded six diminishing returns set in for a fixed solid volume of 0.9mm 3 . For each Bejan number used in this study, there was an optimum channel hydraulic diameter and aspect ratio, solid volume fraction and pin fin aspect ratio that satisfied the global objective.

“…Manufacturing Restraint: Pin-n manufacturing and size constraint allows for typical aspect ratios in the range of 0.5 and 4 [17,18]. Considering fabrication techniques, inter n spacing is limited to 50 microns [19,20]. …”

Section: Constraintsmentioning

confidence: 99%

Multi-scale pin fins: Scale analysis and mathematical optimization of micro-pin fins arranged in rows

2015

Open Engineering

This paper shows the performance of a cylindrical micro-pin ns with multiples-arrays structures for maximum heat transfer. The structures has a varying geometric sizes (diameter, height and spacing). The e ects of Reynolds number and thermal conductivity ratio on the optimized geometric con gurations and the maximum heat transfer rate is documented. Two design con guration were considered. Scales and computational uid dynamics analysis shows that the bene ts of varying n height is minimal. Results show that performace is increased when three rows of micro pin n heat sinks with a reduced degree of freedom ( xed height) when compared to two rows of micro pin ns heat sink for the same amount of material. The optimized diameters of the ns seems to have greatest e ect on perfomance of the heat sink.