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dc.contributor.authorHo, Jin Yaoen_US
dc.contributor.authorLeong, Kai Choongen_US
dc.contributor.authorWong, Teck Nengen_US
dc.identifier.citationHo, J. Y., Leong, K. C., & Wong, T. N. (2019). Experimental and numerical investigation of forced convection heat transfer in porous lattice structures produced by selective laser melting. International Journal of Thermal Sciences, 137, 276-287. doi:10.1016/j.ijthermalsci.2018.11.022en_US
dc.description.abstractForced convection heat transfer in four structured porous materials produced by selective laser melting (SLM) was experimentally and numerically studied. The porous materials are lattice structures consisting of periodic arrangements of Rhombi-Octet unit cells. The lattice structures have similar porosity (ε) but are of different unit cell sizes of 5 mm, 7 mm, 10 mm and 12 mm. This investigation aims to characterize and evaluate the thermo-hydraulic properties of this new class of lattice structures. The hydrodynamic and heat transfer characteristics of the lattices structures such as the permeability (K), inertia coefficient (CE) and Nusselt number (Nu) were determined experimentally in an air flow channel in which the Reynolds number (Re) can be varied between 1300 and 7000. Using a linear heat conduction setup, the stagnant effective thermal conductivities (keff) of the various lattice structures were determined and a relationship between keff and the ligament width (d) of the lattice structure was obtained. Based on the local thermal non-equilibrium model, numerical simulations were performed to determine the interfacial heat transfer coefficients (hsf) of the lattice structures. Our results showed that the pressure drop (ΔP) and Nusselt number (Nu) of the lattice structures increase with decreasing d and the highest Nu of 906 was obtained with the L1 lattice structure which has the smallest ligament width. The lattice structures also exhibited high keff values which were up to 5.5 times higher than that of the aluminum foams. Due to the orderly arrangements of the lattice structures, their permeability-based friction factors (f⋅Da1/2) were found to be lower than the metallic foams. However, their hsf values were also lower. The Colburn j-factor and thermal efficiency index (η) of the lattice structures were determined and found to be higher than those of the commercial metallic foams and conventional pin fin heat sinks. In summary, this investigation demonstrates the promising use of a new class of lattice structures (Rhombi-Octet) for enhancing single-phase forced convection cooling.en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofInternational Journal of Thermal Sciencesen_US
dc.rights© 2018 Elsevier Masson SAS. All rights reserved. This paper was published in International Journal of Thermal Sciences and is made available with permission of Elsevier Masson SAS.en_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleExperimental and numerical investigation of forced convection heat transfer in porous lattice structures produced by selective laser meltingen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.contributor.researchSingapore Centre for 3D Printingen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsForced Convectionen_US
dc.description.acknowledgementThe authors would like to acknowledge the assistance of Mr. Noor Muhammad Bin Noor Khalid and Ms. Lin Li Ng for conducting some of the experiments presented in this paper. The SLM equipment used in this research is supported by the National Research Foundation, Prime Minister's Office, Singapore under its Medium-Sized Centre funding scheme.en_US
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