Homogenized and pore-scale analyses of forced convection through open cell foams

Vijay, Dig; Goetze, Pitt; Wulf, Rhena; Groß, Ulrich

doi:10.1016/j.ijheatmasstransfer.2018.03.008

Cited by 30 publications

(3 citation statements)

References 39 publications

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“…The large deviation in the Nusselt number with respect to viscous dissipation then implies that the dissipative effects must be considered when numerically simulating the system. geometric model obtained from CT images [25]. Particularly, the study considered samples with linear pore densities between 10 PPI, and 30 PPI, and porosity between 79% and 87%.…”

Section: Numerical Modelingmentioning

confidence: 99%

Determining the Thermal Effects of Channels on Porous Heat Sinks Under Forced Convection Conditions with Nanofluid: An Experimental and Numerical Study

Welsford¹

2021

Preprint

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The present study determines the effects which foam metals and Nanofluid have on the performance of a simulated CPU. The present study employs yAl2O3-water Nanofluid and 6061- T6 Aluminum foam metal with a porosity of 0.91 and permeability of 40 pores per linear inch formed in bulk media and porously filled channels. The concentrations evaluated are 0.1%, 0.3%, and 0.6% by volume. The study shall consider both original empirical results and numerical results obtained from COMSOL Multiphysics, showing good agreement with a maximum error of 4.3%. The present study. When considering the average Nusselt number as the representation of the strength of the heat transfer mechanism, and as such ignoring pumping requirements, it is shown that the use of porously filled channels interacting with 0.6% Nanofluid produces the most effective combination. However, when pumping power is relevant, a combination of bulk porous media interacting with 0.3% Nanofluid is observed. The results obtained herein can be applied to the cooling of electronics, or any other system wherein a general inward heat flux is applied.

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Section: Numerical Modelingmentioning

confidence: 99%

Determining the Thermal Effects of Channels on Porous Heat Sinks Under Forced Convection Conditions with Nanofluid: An Experimental and Numerical Study

Welsford¹

2021

Preprint

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“…the foams, are formed during the polymerization and foaming processes. In open cells, pores are connected to each other and form a porous interconnected network when air or water vapor passes through the material fast enough [17]. In the closed cell system, the pores are closed because of the trapped gases, thus forming a much denser material than those in the open cell system.…”

Section: Cell Sizes and Their Surface Areasmentioning

confidence: 99%

Catalytic Effect of Transition Metals (Copper, Iron, and Nickel) on the Foaming and Properties of Sugar-Based Carbon Foams

2019

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Recently, bio-based carbon foams have gained much interest in many chemical industry fields because of their unique structure and properties. This study provides new information on the effects of catalytic metals (iron, nickel, and copper) on the foaming process. Specifically, the effects of these catalysts on the density, foam growth, and cell size and then further on the pore size distribution and specific surface areas after the physical activation are considered. Furthermore, some of the activated sugar foams were used in adsorption tests using methylene blue as adsorbent. Results showed that the highest effect on foam density was obtained using the iron catalyst in the foaming process. In addition, increasing the iron amount, the development of micro-pores decreased from 95.2 to 60.3% after cabonization and activation of the foams. Nickel and iron had the highest and lowest effect on foam rise at 1375 and 500%, respectively. Interestingly, when the nickel catalyst was used, cell sizes and surface areas two times larger than those when the foams were prepared with the iron and copper catalysts was obtained. The specific surface area of activated sugar-based carbon foams changed significantly with the increased copper amount inside the foaming solution in compared with iron or nickel catalyst. Methylene blue adsorption capacity of additional series of activated sugar foams decreased from 28 to 9% when meso-pore amount decreased.

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“…However, a larger Reynolds number would result in a larger difference between the two structures. Vijay [38] concluded that a simplified foam structure could not represent real foam when considering a heat transfer via the foam tortuous structure. In fact, the exact use of geometric models and large computational demands can lead to limited numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Convective Heat Transfer and Local Thermal Equilibrium in Ceramic Foam

Han

et al. 2020

Processes

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Foam materials have been widely used in various industrial applications, where higher and higher heat and mass transfer performances are pursued. However, the mechanism of many factors on the heat transfer performances is still unclear. The main purpose of this article is to investigate how the porous properties, porosity, cell size and the sample thickness affect the volumetric convective heat transfer. In this study, the single-blow method is used to determine the volumetric heat transfer coefficient of ceramics foam in the temperature range from 283 K to 323 K. In particular, sensitivity analysis of the foam porosity, cell size, velocity and the sample thickness on the volumetric heat transfer coefficient within the ceramics foam were all conducted. The results indicate that the sample thickness has a significant effect on the volumetric heat transfer coefficient which decreases with the sample thickness. In addition, the local thermal equilibrium phenomenon is verified and its influence on the volumetric heat transfer coefficient discussed. Based on the experimental data, a new correlation is proposed that includes sample thickness, porosity, superficial velocity and fluid properties. This study is crucial to the theory of the convective heat transfer inside the porous media, and can be used to guide the design and optimization of volumetric solar air receivers, compact heat exchangers, heat sinks, heat regenerators, packed bed reactors and so on.

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Homogenized and pore-scale analyses of forced convection through open cell foams

Cited by 30 publications

References 39 publications

Determining the Thermal Effects of Channels on Porous Heat Sinks Under Forced Convection Conditions with Nanofluid: An Experimental and Numerical Study

Determining the Thermal Effects of Channels on Porous Heat Sinks Under Forced Convection Conditions with Nanofluid: An Experimental and Numerical Study

Catalytic Effect of Transition Metals (Copper, Iron, and Nickel) on the Foaming and Properties of Sugar-Based Carbon Foams

Experimental Study of the Convective Heat Transfer and Local Thermal Equilibrium in Ceramic Foam

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