Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Thermal Characteristics of Additively-Manufactured Metamaterial Structures in Air flow Condition

Jonghwan No1,2, Min-Kyeom Kim1, Taehwan Kim1, Juwon Kim1 and Jonghwan Suhr1,a

1Department of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Gyeonggi-do, Republic of Korea

2Global Technology Research, Samsung Electronics, 129, Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, Republic of Korea


The metamaterial structures exhibit various mechanical properties such as high strength/stiffness, energy absorption, and lightweight. Additionally, it has unprecedented thermal performances via high specific surface area and complex flow patterns inside the pore. Accordingly, the metamaterial structures have been widely studied in recent years because of these advantages, having a great attention as the thermal management structures for transportation, manufacturing, and electronics industries. In this study, thermal performances and fluid flow characteristics of the metamaterial structures were comprehensively explored for them to be used in a 3D cooling channel system in a mold. The performances of metamaterial structure channels, fabricated with the powder bed fusion (PBF) technique and using 17-4 PH stainless steel, were numerically and experimentally investigated. It was observed that, in case of forced convection, complex flow pattern and porosity ratio of the structures affected the heat dissipating ability and pressure drop, which is encouraged to be improved via a porosity graded design. It was confirmed that the shape, wall thickness and specific surface area of the structures determines heat dissipation in the forced convection. The investigated characteristics can be applied to the design of 3D cooling channel mold.
This work could give an understanding of the correlation between air convection and thermal characteristics of various metamaterial structures along with the mechanical properties of them. Moreover, the structures could be a guideline for designing the structures for the industrial applications such as thermal insulation, heat dissipation and cooling channel system.

Keywords: Laser powder bed fusion, Additive manufacturing, Metamaterial structure, Thermal performance, Air cooling.

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