Experimental and numerical investigation of forced convection heat transfer in porous lattice structures produced by selective laser melting

Ho, Jin Yao; Leong, K.C.; Wong, Teck Neng

doi:10.1016/j.ijthermalsci.2018.11.022

Cited by 85 publications

(20 citation statements)

References 36 publications

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“…As in other studies involving heat sinks, the main goal is to reach heat sink temperatures as low as possible, minimizing thermal resistance. The computational domain ( Figure 1 ) includes a heat sink (main dimensions 50 × 50 × 50 mm 3 ) and a wind tunnel, designed so that the total flow converges to the heat sink, avoiding the bypass phenomenon [ 25 , 55 ]. It was considered a fan diameter of 80 mm.…”

Section: Problem Descriptionmentioning

confidence: 99%

“…Lattice structures have showed high potential in increasing forced convection heat transfer. They consist of orderly unit cell arrangements, which can have different configurations such as hexagon, honeycomb, and pyramidal [ 55 ]. They have large surface area-to-volume ratios, are light, and promote tortuous fluid paths, promoting fluid mixing.…”

Section: Introductionmentioning

confidence: 99%

“…They have large surface area-to-volume ratios, are light, and promote tortuous fluid paths, promoting fluid mixing. Their advantage over metal foams are constant periodicity and homogeneity allowing optimization of the ligament configuration and diameter, better mechanical properties, and greater ease of production with emerging additive manufacturing technologies [ 54 , 55 , 56 ]. The study of the fluid flow through them has become popular in thermal management [ 55 , 56 , 57 , 58 , 59 ].…”

Section: Introductionmentioning

confidence: 99%

“…Although the lattice structure heat sink allows a high surface area to volume ratios, its performance may be limited by the absense of interaction between the cooling air and structure [ 7 ]. According to Ho et al [ 55 ], pressure drop and Nusselt number of Rhombi-Octet lattice structures increased with decreasing unit cell size and the highest Nusselt number was obtained with the lattice structure with the smallest ligament width. The same conclusion was obtained by Son et al [ 60 ].…”

Section: Introductionmentioning

confidence: 99%

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

2021

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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.

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Section: Problem Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2021

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“…Ho et al applied periodic lattice of Rhombi-Octet unit cell to the design of key cooling components. The simulation and experimental results show that the periodic lattice structure improves the thermal performance of the structure [12,13]. Shen et al [14] replaced pin fins of wedge-shaped channels with a Kagome lattice structure, which enhanced the heat dissipation performance by 20∼35%.…”

Section: Introductionmentioning

confidence: 99%

Leaf Vein-Inspired Bionic Design Method for Heat Exchanger Infilled with Graded Lattice Structure

2021

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Due to its excellent performance and high design freedom, the lattice structure has shown excellent capabilities and considerable potential in aerospace and other fields. This paper proposes a method to map the biometric model to the lattice structure. Taking leaf veins as bionic objects, they are used to generate a bionic design with a gradient lattice structure to improve the performance of a heat exchanger. In order to achieve the above goals, this article also proposes a leaf vein model and a mapping method that combine the leaf vein model with the lattice structure. A series of transient thermal finite element simulations was conducted to evaluate and compare the heat dissipation performance of different designs. The analysis results show that the combination of the bionic design and the lattice structure effectively improves the heat dissipation performance of the lattice structure heat exchanger. The results indicate that the application of bionic design in lattice structure design has feasibility and predictable potential.

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Bioinspired, Simulation‐Guided Design of Polyhedron Metamaterial for Simultaneously Efficient Heat Dissipation and Energy Absorption

Zhang

Song

Yao

et al. 2022

Adv Materials Technologies

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Light‐weight, high‐strength metamaterials with excellent heat dissipation and energy absorption capabilities are of great interest to aerospace and automobile applications. Particularly, innovative structure design and its successful realization are paramount but often challenging due to the vast design space and associated complex manufacturing. Herein, in this study, inspired by pomelo peel's superior shielding protection to the pulp, bionic polyhedron metamaterials (BPMs) that imitate the pomelo peel are designed and realized by metal 3D printing to achieve not only superior heat dissipation but also high energy absorption. Guided by experiments and numerical simulations, the BPM with circular struts possesses the highest Nusselt number, lowest pressure drop, and friction factor at Re = 7000–30000. Above results integrated lead to that the BPM with circular struts exhibit a higher thermal efficiency index that exceeds 1 at 0.92 porosity. Furthermore, the BPM with circular struts possesses moderate specific energy absorption in existing mechanical metamaterials for their corresponding density, which has potential for gas turbines and some cooling structures. The above findings will guide the design of metamaterials with high heat dissipation and energy absorption.

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Experimental and numerical investigation of forced convection heat transfer in porous lattice structures produced by selective laser melting

Cited by 85 publications

References 36 publications

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

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

Leaf Vein-Inspired Bionic Design Method for Heat Exchanger Infilled with Graded Lattice Structure

Bioinspired, Simulation‐Guided Design of Polyhedron Metamaterial for Simultaneously Efficient Heat Dissipation and Energy Absorption

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