S. Gijoy , M.A. Gayathri , S. Rejin , K.E. Reby Roy
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Numerical investigation and optimization of an asymmetric elliptical-cylindrical pin fin heat sink
A 3D numerical simulation was performed to analyse the heat transfer characteristics of an asymmetric elliptical-cylindrical pin fin heat sink (AECPFHS) in a turbulent flow scenario and to determine the optimum asymmetric elliptical-cylindrical pin fin (AECPF) structure. The investigation is performed in three stages. The numerical procedure and the software tool used in the current research are first validated with another work in which the performance enhancement of a heat sink with staggered cylindrical pin fins (CPFs) was studied. A cylindrical pin fin heat sink (CPFHS) with staggered fins was considered as the reference case. In the next stage, the heat sink with staggered solid-AECPFs (SAECPFs) was simulated, and its performance was compared with the reference case. The highest fin effectiveness obtained was 1.43 for the fin radius (r) to channel height (H) ratio (r/H) = 0.9. This structure was chosen as the base case, and in the third stage, its performance is improved by adding perforation on AECPFs. The influence of nine distinct perforation patterns of three different hole size were selected, and their thermal performance was analysed in detail. The highest fin effectiveness noted for the fins with 8 holes of 3 mm diameter is 2.25 at Re 3111. Furthermore, with the proposed perforated-AECPFHS (PAECPFHS) structure, in comparison to the reference case, the volume of the fins was lowered by as much as 60 %.
期刊介绍：
The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review.
The fundamental subjects considered within the scope of the journal are:
* Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow
* Forced, natural or mixed convection in reactive or non-reactive media
* Single or multi–phase fluid flow with or without phase change
* Near–and far–field radiative heat transfer
* Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...)
* Multiscale modelling
The applied research topics include:
* Heat exchangers, heat pipes, cooling processes
* Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries)
* Nano–and micro–technology for energy, space, biosystems and devices
* Heat transport analysis in advanced systems
* Impact of energy–related processes on environment, and emerging energy systems
The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.
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