Forced convection through open cell foams based on homogenization approach: Transient analysis

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

doi:10.1016/j.ijthermalsci.2015.07.013

Cited by 14 publications

(2 citation statements)

References 23 publications

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“…For this reason, based on the experimental data, the numerical inversion method has been used to obtain the volumetric heat transfer coefficient [19]. Based on this principle, the steady-state method in which a heat source is fixed to a wall-heated foam material and the single-blow method in which a fluid heated or cooled foam material are proposed [20,21]. Under the experimental conditions, the steady-state method has a temperature gradient in the channel, and the volumetric heat transfer coefficient mostly depends on the thermal conductivity of the solid phase.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Study on Convective Heat Transfer Characteristics in Foam Materials

Han

Yang

Wu³

et al. 2020

Energies

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Foam materials are widely used in heat exchange because of their high porosity and large specific surface area. Correctly characterizing heat transfer characteristics is the key to ensuring efficient heat transfer. In this paper, single-blow transient test technology is used to experimentally measure the temperature. Silicon carbide ceramics with various thicknesses ranging from 30 to 105 mm and different pore structures were used in the experiments. The test was carried out at the velocity ranging from 0.5 to 1.8 m/s. The air temperature distributions of the inlet and outlet were obtained by processing the experimental data, and the regularity of the average volumetric heat transfer coefficient was obtained and analyzed. Subsequently, the simplified tetrakaidecahedron models with a porosity of 0.85 and 0.75 were used to analyze the heat transfer characteristics. The local thermal equilibrium and local thermal non-equilibrium at the pore scale were analyzed. By comparing the simulation with the experiment, it shows that the larger thickness affects local thermal equilibrium and leads to a decrease in the volumetric heat transfer coefficient. The conclusion can be used to guide the optimization of the design of foam material-mediated heat exchange equipment.

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Section: Introductionmentioning

confidence: 99%

“…Although a large number of correlations relate to porosity, pore size, and velocity are obtained through experiments and numerical simulations [20,[28][29][30][31][32]. The phenomenon of local thermal equilibrium (LTE) easily occurs inside the foam due to the complex structure and the high volumetric heat transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study on Convective Heat Transfer Characteristics in Foam Materials

Han

Yang

Wu³

et al. 2020

Energies

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Characterization of Heat Transport and Diffusion Processes During Metal Melt Filtration

Heisig,

Markuske,

Wulf

et al. 2024

Springer Series in Materials Science

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This chapter contains a summary of thermodynamic investigations of ceramic filters, metal melts and their interaction, which can serve as a basis for the optimization of the filters as well as the casting and metal melt filtration process. First, the thermophysical properties of two different filter base materials are briefly discussed. Subsequently, after demonstrating measurement conditions and parameters, the effective thermal conductivities of filters with varying pore size, porosity and material measured by the Transient-Plane-Source method at temperatures up to 700 °C are presented. The experimental determination of radiative properties of the filters using a Fourier-transform infrared spectrometer with an external integrating sphere was compared to simple predictive methods. Finally, after performing experiments with air, a measurement section was created and further developed to determine the volumetric heat transfer coefficient during metal melt filtration. The first results obtained with aluminum melt are presented.In addition to the knowledge of heat transport processes, the understanding of the sorption and diffusion behavior of various gases in metal melts is important. Therefore, a thermogravimetric apparatus, which enables the direct determination of the mass changes caused by (ab-)sorption using a high-precision magnetic suspension balance, was modified especially for this measurement task.

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Experimental based numerical approach for determination of volumetric heat transfer coefficients of modified graphite foams

Gürüf

Solmuş

Bilen

et al. 2020

Applied Thermal Engineering

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Forced convection through open cell foams based on homogenization approach: Transient analysis

Cited by 14 publications

References 23 publications

Numerical and Experimental Study on Convective Heat Transfer Characteristics in Foam Materials

Numerical and Experimental Study on Convective Heat Transfer Characteristics in Foam Materials

Characterization of Heat Transport and Diffusion Processes During Metal Melt Filtration

Experimental based numerical approach for determination of volumetric heat transfer coefficients of modified graphite foams

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