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Flow and Heat Transfer in Porous Media

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Dear Colleagues,

It is my immense pleasure to invite you to contribute to a high-impact Special Issue on the general subject of “Flow and Heat Transfer in Porous Media”. Fluid flow and heat transfer in porous media are involved in various fields in our daily lives. Research into the field of fluid flow with heat and mass transfer is essential for the advancement of applied science, engineering and technology fields. Therefore, this Special Issue aims to focus on advanced and recent topics in the fields of analytical, numerical and experimental techniques on fluid dynamics with heat and mass transfer in porous media.

Topics of interest for this Special Issue include, but are not limited to, the following: fluid flow and heat/mass transfer in porous media, drying technology, geothermal systems, microfluidics, nanofluidics, multiphase flows, heat pipes, thermal energy systems, HVAC systems, renewable energy systems and thermal system design and optimization.

Prof. Dr. Sivanandam Sivasankaran
Prof. Dr. Marimuthu Bhuvaneswari
Guest Editors

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Research

19 pages, 15234 KiB

Open AccessArticle

Charging of an Air–Rock Bed Thermal Energy Storage under Natural and Forced Convection

by Ashenafi Kebedom Abrha, Mebrahtu Kidanu Teklehaymanot, Mulu Bayray Kahsay and Ole Jørgen Nydal

Energies 2024, 17(19), 4952; https://doi.org/10.3390/en17194952 - 3 Oct 2024

Viewed by 468

Abstract

An air-rock bed thermal storage system was designed for small-scale powered generation and analyzed with computational fluid dynamics (CFD) using ANSYS-Fluent simulation. An experimental system was constructed to compare and validate the simulation model results. The storage unit is a cylindrical steel container with granite rock pebbles as a storage medium. The CFD simulation used a porous flow model. Transient-state simulations were performed on a 2D axisymmetric model using a pressure-based solver. During charging, heat input that keeps the bottom temperature at 550 °C was applied to raise the storage temperature. Performance analysis was conducted under various porosities, considering natural and forced convection. The natural convection analysis showed insignificant convection contribution after 10 h of charging, as observed in both average air velocity and the temperature profile plots. The temperature distribution profiles at various positions for both convection modes showed good agreement between the simulation and experimental results. Additionally, both cases exhibited similar temperature growth trends, further validating the models. Forced convection reduced the charging time from 60 h to 5 h to store 70 MJ of energy at a porosity of 0.4, compared to natural convection, which stored only 50 MJ in the same time. This extended charging period was attributed to poor natural convective heat transfer, indicating that relying solely on natural convection for thermal energy storage under the given conditions is not practical. Using a small fan to enhance heat transfer, forced convection is a more practical method for charging the system, making it suitable for power generation applications. Full article

(This article belongs to the Special Issue Flow and Heat Transfer in Porous Media)

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26 pages, 30266 KiB

Open AccessArticle

Heat Transfer in 3D Laguerre–Voronoi Open-Cell Foams under Pulsating Flow

by Aidar Khairullin, Aigul Haibullina, Alex Sinyavin, Denis Balzamov, Vladimir Ilyin, Liliya Khairullina and Veronika Bronskaya

Energies 2022, 15(22), 8660; https://doi.org/10.3390/en15228660 - 18 Nov 2022

Cited by 3 | Viewed by 1540

Abstract

Open-cell foams are attractive for heat transfer enhancement in many engineering applications. Forced pulsations can lead to additional heat transfer enhancement in porous media. Studies of heat transfer in open-cell foams under forced pulsation conditions are limited. Therefore, in this work, the possibility of heat transfer enhancement in porous media with flow pulsations is studied by a numerical simulation. To generate the 3D open-cell foams, the Laguerre–Voronoi tessellation method was used. The foam porosity was 0.743, 0.864, and 0.954. The Reynolds numbers ranged from 10 to 55, and the products of the relative amplitude and the Strouhal numbers ranged from 0.114 to 0.344. Heat transfer was studied under the conditions of symmetric and asymmetric pulsations. The results of numerical simulation showed that an increase in the amplitude of pulsations led to an augmentation of heat transfer for all studied porosities. The maximum intensification of heat transfer was 43%. Symmetric pulsations were more efficient than asymmetric pulsations, with Reynolds numbers less than 25. The Thermal Performance Factor was always higher for asymmetric pulsations, due to the friction factor for symmetrical pulsations being much higher than for asymmetric pulsations. Based on the results of a numerical simulation, empirical correlations were obtained to predict the heat transfer intensification in porous media for a steady and pulsating flow. Full article

(This article belongs to the Special Issue Flow and Heat Transfer in Porous Media)

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