Reduced material model for closed cell metal foam infiltrated with phase change material based on high resolution numerical studies

Ohsenbrügge, Christoph; Marth, Wieland; Sosa, Iñaki Navarro y de; Drossel, Welf‐Guntram; Voigt, Axel

doi:10.1016/j.applthermaleng.2015.09.102

Cited by 17 publications

(4 citation statements)

References 19 publications

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“…For aluminum lattices with a specific density greater than 0.6, the Ashby lower bound was found to provide a convenient approximation. As the Ashby lower bound in the work of Ohsenbrügge et al was considered a good estimation of the effective thermal conductivity of closed-cell aluminum foams [32], it can be stated that both structure types, aluminum BCC lattices and closed-cell aluminum foams, exhibit similar heat-transfer characteristics at a congruent specific density.…”

Section: Discussionmentioning

confidence: 99%

“…where k s is the thermal conductivity of the foam material [31]. Ohsenbrügge et al stated that the lower Ashby bound was found to be in good agreement with the effective thermal conductivity of the closed-cell aluminum foam examined in their work [32]. Both approaches were applied to the specifications of the fabricated specimens and evaluated with respect to the estimation quality.…”

Section: Analytical Estimationmentioning

confidence: 99%

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Heat-Transfer Properties of Additively Manufactured Aluminum Lattice Structures in Combination with Phase Change Material

Voigt,

Schmerler,

Korn

et al. 2024

Materials

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Compared to sensible heat storage, latent heat storage provides higher energy density due to the enthalpy difference of the storage medium undergoing a phase change. However, the heat storage capability of phase change materials is opposed by low thermal conductivity. To enable sufficient heat transfer within a latent heat storage unit, phase change materials can be used in combination with a metallic matrix. One approach is the infiltration of phase change materials into additively manufactured metallic lattice structures. In this work, the fabrication of aluminum lattice structures through laser powder bed fusion is described. During fabrication, the cell size and the strut diameter were varied to obtain specimens of different geometries. To obtain the thermal conductivity of the fabricated lattices, measurements were conducted based on the transient plane source method. Additionally, finite element simulations were carried out to evaluate the effect of fabrication and measurement uncertainties. The thermal conductivity of the fabricated lattices was found to be between 3 W/(m·K) and 130 W/(m·K). The numerically and analytically performed calculations provide good estimations of the experimentally obtained data.

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Section: Discussionmentioning

confidence: 99%

Section: Analytical Estimationmentioning

confidence: 99%

Heat-Transfer Properties of Additively Manufactured Aluminum Lattice Structures in Combination with Phase Change Material

Voigt,

Schmerler,

Korn

et al. 2024

Materials

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“…A pesar de su relevancia, las investigaciones de las propiedades de medios porosos con celdas cerradas son pocas si se comparan con aquellas para medios con celdas abiertas y muchas de estas investigaciones están enfocadas esencialmente en las propiedades estructurales o mecánicas, más que en propiedades de transporte de energía o masa. Estos fenómenos de transporte, son descritos por las propiedades termofísicas de los materiales y la mayoría de los artículos existentes están enfocados en determinar la conductividad térmica efectiva, kef, en estado estacionario (Deng et al, 2017;Lu et al, 2014;Zhu et al, 2014;Ohsenbrugge et al, 2016).…”

Section: Introductionunclassified

Evaluación de la difusividad térmica efectiva en el estado transitorio de una geometría fractal para condiciones de temperatura y flujo de calor constantes

Rosas Yescas,

Acosta Cano de los Ríos,

Chávez López

et al. 2023

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En este trabajo se comparan dos modelos para calcular la difusividad térmica efectiva usada en simulaciones de fenómenos transitorios con diferencias finitas de medios porosos con geometría fractal del tipo Alfombra de Sierpinsky. Se evalúa la coincidencia entre los resultados obtenidos utilizando estos modelos y simulaciones de elemento finito. Esta comparación se hace para dos condiciones: temperatura constante y flujo de calor constante y para diferentes valores de la porosidad. La simulación en elemento finito se hace utilizando el software Solidworks (SW) y las simulaciones con diferencias finitas utilizan el enfoque de equilibrio térmico local. Los resultados muestran que dependiendo del fenómeno a simular se puede utilizar alguno de los dos modelos. El modelo utilizado reproduce de manera adecuada el efecto de la porosidad en la evolución temporal de la temperatura, pero la distribución espacial no se ve afectada por este parámetro.

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“…The current state of the art shows examples and applications of MT structures made of hybrid materials [ 12 , 13 , 14 , 15 , 16 , 17 ], nevertheless these studies do not offer a complete comparison between materials, based on the static and dynamic performances of the mobile parts. The modern machines need to satisfy high and strict requirements in terms of precision, speed, and flexibility.…”

Section: Introductionmentioning

confidence: 99%

Vibration Damping Analysis of Lightweight Structures in Machine Tools

et al. 2017

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The dynamic behaviour of a machine tool (MT) directly influences the machining performance. The adoption of lightweight structures may reduce the effects of undesired vibrations and increase the workpiece quality. This paper aims to present and compare a set of hybrid materials that may be excellent candidates to fabricate the MT moving parts. The selected materials have high dynamic characteristics and capacity to dampen mechanical vibrations. In this way, starting from the kinematic model of a milling machine, this study evaluates a number of prototypes made of Al foam sandwiches (AFS), Al corrugated sandwiches (ACS) and composite materials reinforced by carbon fibres (CFRP). These prototypes represented the Z-axis ram of a commercial milling machine. The static and dynamical properties have been analysed by using both finite element (FE) simulations and experimental tests. The obtained results show that the proposed structures may be a valid alternative to the conventional materials of MT moving parts, increasing machining performance. In particular, the AFS prototype highlighted a damping ratio that is 20 times greater than a conventional ram (e.g., steel). Its application is particularly suitable to minimize unwanted oscillations during high-speed finishing operations. The results also show that the CFRP structure guarantees high stiffness with a weight reduced by 48.5%, suggesting effective applications in roughing operations, saving MT energy consumption. The ACS structure has a good trade-off between stiffness and damping and may represent a further alternative, if correctly evaluated.

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Reduced material model for closed cell metal foam infiltrated with phase change material based on high resolution numerical studies

Cited by 17 publications

References 19 publications

Heat-Transfer Properties of Additively Manufactured Aluminum Lattice Structures in Combination with Phase Change Material

Heat-Transfer Properties of Additively Manufactured Aluminum Lattice Structures in Combination with Phase Change Material

Evaluación de la difusividad térmica efectiva en el estado transitorio de una geometría fractal para condiciones de temperatura y flujo de calor constantes

Vibration Damping Analysis of Lightweight Structures in Machine Tools

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