Study on the Thermal Properties of Closed-Cell Metal Foams Based on Voronoi Random Models

Li, Zhiqiang; Zhang, Jianjun; Wang, Zhi Hua; Song, Yanze; Zhao, Longmao

doi:10.1080/10407782.2013.811159

Cited by 12 publications

(5 citation statements)

References 21 publications

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“…As mentioned before, higher Voronoi randomness ensures better thermal insulation property [18,19]. Meanwhile, in terms of compressive strength, the R7-PCM14 also did not show obvious strength decrease compared to the R7-REF.…”

Section: Influence Of Mpcm On Out-of-plane Strengthmentioning

confidence: 59%

“…In terms of thermal insulation, Voronoi structure has been observed to possess excellent properties. Compared to traditional hexagonal honeycombs, References [18,19] demonstrated that Voronoi structure with higher irregularity possess improved thermal insulation property (lower thermal conductivity). With the help of experimental and numerical analysis, many studies have attempted to integrate Voronoi structure constituted by metal and polymers to fabricate cellular composites with excellent thermal performance [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…Compared to traditional hexagonal honeycombs, References [18,19] demonstrated that Voronoi structure with higher irregularity possess improved thermal insulation property (lower thermal conductivity). With the help of experimental and numerical analysis, many studies have attempted to integrate Voronoi structure constituted by metal and polymers to fabricate cellular composites with excellent thermal performance [19][20][21]. Considering the application of building thermal insulation, 2D Voronoi structure are easy to be manufactured, and the in-plane direction (shown in Figure 1) of the Voronoi structure would be used to insulate heat for the superior thermal properties.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties of Lightweight Cementitious Cellular Composites Incorporating Micro-Encapsulated Phase Change Material

Šavija

2021

Materials

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This work focuses on combining digitally architected cellular structures with cementitious mortar incorporating micro-encapsulated phase change material (mPCM) to fabricated lightweight cementitious cellular composites (LCCCs). Voronoi structures with different randomness are designed for the LCCCs. Aided by the indirect 3D printing technique, the LCCCs were prepared with a reference mortar (REF) and a mortar incorporating mPCM. The compressive behavior of the LCCCs was studied at the age of 28 days, by experimental and numerical methods. It was found that the highly randomized Voronoi structure and the mPCM have minor negative influence on the compressive properties of the LCCCs. The mPCM incorporated LCCCs have high relative compressive strength compared to conventional foam concrete. Furthermore, the critical role of air voids defects on the compressive behavior was identified. The highly randomized porous Voronoi structure, high mPCM content and good compressive strength ensure the LCCCs’ great potential as a novel thermal insulation construction material.

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Section: Influence Of Mpcm On Out-of-plane Strengthmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties of Lightweight Cementitious Cellular Composites Incorporating Micro-Encapsulated Phase Change Material

Šavija

2021

Materials

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“…1. Close-cell aluminum foams core with given cell shape irregularity (0.8) has been constructed based on 3-D Voronoi structure by Li et al in published literature [8], and its length in x-, y-, and z-direction is 0.04 m, 0.04 m, and 0.02 m, respectively. Closed-cell aluminum foams are 5052 aluminum alloy.…”

Section: Finite Element Models Of Sandwich Panels With Heat-protect L...mentioning

confidence: 99%

Thermal-mechanical behavior of sandwich panels with closed-cell foam core under intensive laser irradiation

Song

Tang

et al. 2014

THERM SCI

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Temperature field and thermal deformation of sandwich panels with closed-cell aluminum alloy foam core and heat-protective layer, which are subjected to Gaussian laser beam intensively irradiating, are investigated numerically. In transient heat analysis models, the influence of thermal conductivity, specific heat, and thickness of heat-protective layer on the temperature rise of the sandwich panels is calculated. In stress analysis models, a sequence coupled numerical method is utilized to simulate the thermal stress and deformation of sandwich panels induced by thermal expansion. Simulation results indicate that the temperature at center of sandwich panel increases firstly and then drops gradually with the increase of thermal conductivity of heat-protective layer after laser irradiation, and the critical thermal conductivity is obtained, while it decreases with the increase of specific heat and thickness of heat-protective layer. The thermal stress verifies the ?Cyclo-hoop effect?, i. e. radial stress is compression stress in ?hot zone? and tension stress in ?cold zone?. The max thermal deformation of sandwich panels slightly increases with the increase of thickness of heat-protective layer for given specific heat and thermal conductivity.

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“…But the discontinuous structure of the metal additives is different from the actual metal frame. More significantly, the Voronoi random model [20] has been used to investigate the influences of density, thickness and imperfection of pore edges on the metal foam for the composite PCM due to the merits of flexibility, controllability, diversity, and high quality. Therefore, by using the Voronoi random model, metal foam/PCM composite with microstructure is generated.…”

Section: Introductionmentioning

confidence: 99%

Lattice Boltzmann simulation on thermal performance of composite phase change material based on Voronoi models*

Guo¹,

Han²,

Liu³

et al. 2021

Chinese Phys. B

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Phase change materials (PCMs) are important for sustaining energy development. For the thermal performance enhancement, the composite PCM with metal foam reconstructed by the Voronoi method is investigated in this work. The lattice Boltzmann method (LBM) is used to analyze the melting process on a pore scale. The melting interface evolution and temperature contour of the composite PCM are explored and compared with those of pure PCM. Moreover, structure parameters including the pore density, porosity and irregularity are investigated comprehensively, indicating that the additive of metal foam strengthens the melting performance of PCM obviously. Compared with pure PCM, the composite PCM has quick rates of the melting front evolution and heat transfer. The heat conduction plays a great role in the whole melting process since the convection is weakened for the composite PCM. To improve the melting efficiency, a larger pore density and smaller irregularity are recommended in general. More significantly, a suitable porosity is determined based on the requirement for the balance between the melting rate and heat storage capacity in practical engineering.

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Study on the Thermal Properties of Closed-Cell Metal Foams Based on Voronoi Random Models

Cited by 12 publications

References 21 publications

Mechanical Properties of Lightweight Cementitious Cellular Composites Incorporating Micro-Encapsulated Phase Change Material

Mechanical Properties of Lightweight Cementitious Cellular Composites Incorporating Micro-Encapsulated Phase Change Material

Thermal-mechanical behavior of sandwich panels with closed-cell foam core under intensive laser irradiation

Lattice Boltzmann simulation on thermal performance of composite phase change material based on Voronoi models*

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