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ISSN Online: 2688-7231

ISBN Online: 978-1-56700-524-0

Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
December, 17-20, 2021, IIT Madras, Chennai, India

Effective Thermal Conductivity of Hollow Strut-based Periodic Cellular Solids

Get access (open in a dialog) DOI: 10.1615/IHMTC-2021.3160
pages 2091-2096

要約

Periodic cellular solids (PCS) (i.e., open-cell metallic microlattices with the same unit cell periodically repeated in all directions) are widely used for convective cooling in many thermal management applications because of their high specific surface-area-to-weight ratio and multifunctional applications such as load-bearing, sound absorption, and others. Effective thermal conductivity (keff) is one of the critical PCS properties for convective cooling applications as PCS with better keff have good fin efficiency. Hollow strut-based PCS (HPCS) consists of unit cells with hollow struts. HPCS has interesting mechanical properties. For example, it has more stiffness and fracture toughness than solid strut-based PCS of the same porosity. Also, it has excellent anti-buckling, anti-crushing, and anti-impact properties. So, HPCS can act as a good candidate for multifunctional applications involving heat transfer with load-bearing requirements. Hence it is essential to study the effective thermal conductivity of HPCS. This study introduces a novel method to fabricate conductive HPCS. An analytical model is developed to calculate the keff of the unit cell of HPCS using a thermal resistance approach. Also, a parametric study is undertaken to explore the impact of coating thickness and polymer substrate on overall keff.