Evaluation of Active Heat Sinks Design under Forced Convection—Effect of Geometric and Boundary Parameters

Abstract

This study shows the performance of heat sinks (HS) with different designs under forced convection, varying geometric and boundary parameters, via computational fluid dynamics simulations. Initially, a complete and detailed analysis of the thermal performance of various conventional HS designs was taken. Afterwards, HS designs were modified following some additive manufacturing approaches. The HS performance was compared by measuring their temperatures and pressure drop after 15 s. Smaller diameters/thicknesses and larger fins/pins spacing provided better results. For fins HS, the use of radial fins, with an inverted trapezoidal shape and with larger holes was advantageous. Regarding pins HS, the best option contemplated circular pins in combination with frontal holes in their structure. Additionally, lattice HS, only possible to be produced by additive manufacturing, was also studied. Lower temperatures were obtained with a hexagon unit cell. Lastly, a comparison between the best HS in each category showed a lower thermal resistance for lattice HS. Despite the increase of at least 38% in pressure drop, a consequence of its frontal area, the temperature was 26% and 56% lower when compared to conventional pins and fins HS, respectively, and 9% and 28% lower when compared to the best pins and best fins of this study.

Pengaruh Modifikasi Geometri Fins Terhadap Performa Termal Heatsink Vertikal

“…Modifikasi ini melibatkan perubahan dalam desain fins yang merupakan elemen utama dari heatsink dengan pengurangan ketahanan termal berbasis massa sebesar 45% [18]. Modifikasi geometri fins [19] adalah pendekatan yang efektif untuk meningkatkan luas area permukaan kontak dengan udara sekitarnya dan dengan demikian meningkatkan efek perpindahan panas pada heatsink, sehingga memungkinkan penyerapan panas perangkat elektronik atau mesin lebih efisien dan disalurkan ke lingkungan sekitar. Salah satu modifikasi yang telah dilakukan adalah merubah bentuk silinder dioda dan menambah jumlah sirip, ketebalan, ukuran panjang (dimensi radial) dan tinggi [20].…”

“…Perbedaan bentuk sirip menghasilkan kinerja yang berbeda. Hasil sejalan dengan hasil penelitian sirip radial, dimana sirip dengan bentuk trapesium terbalik berlubang memiliki keunggulan besar dan desain ini merupakan desain yang kinerjanya lebih baik, sehingga variasi bentuk pin bermanfaat untuk kinerja termal [19]. Demikian juga hasil penelitian ini telah sesuai dengan hasil yang diperoleh dalam peelitian validasi eksperimental bentuk optimal heatsink yang diproduksi secara aditif untuk pendinginan pasif, yang mengukur beban pada variasi daya input terhadap temperatur penyerapan kalor [13].…”

Hybrid Manufacturing of Aluminium Parts Combining Additive and Conventional Technologies—Mechanical and Thermal Properties

“…Although thermal properties of an equivalent aluminium bulk material may be known, the use of additive manufacturing as a processing technique can result in different values. Uncertainties in the thermal properties may induce under-or overvalued results in thermal management applications such as injection-moulding inserts or additively manufactured heat sinks [25,26]. For this reason, a better understanding of these properties is an important step.…”

Influence of fin thickness variation on the thermal performance of metallic foam heat sink laminar condition

“…In order to better understand how heat sinks (HS) with diverse designs operate in forced convection, [11] used computational fluid dynamics simulations to examine the effect of changing geometric and boundary characteristics.…”