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6 results on '"Afass, Ayoub"'

1. Investigation of a Buoyant Bubble Motion in a Wall-Driven Square Cavity

Author

Afass, Ayoub, Bergadà, Josep M., Derfoufi, Soufiane, Ahachad, Mohammed, Mahdaoui, Mustapha, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Ali-Toudert, Fazia, editor, Draoui, Abdeslam, editor, Halouani, Kamel, editor, Hasnaoui, Mohammed, editor, Jemni, Abdelmajid, editor, and Tadrist, Lounès, editor

Published
2024
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2. Thermal Performance of a Heat Sink with Nanoparticles Integrated in a Phase Change Material

Author

Briache, Ayoub, Afass, Ayoub, Ouardouz, Mustapha, Ahachad, Mohammed, Mahdaoui, Mustapha, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Ali-Toudert, Fazia, editor, Draoui, Abdeslam, editor, Halouani, Kamel, editor, Hasnaoui, Mohammed, editor, Jemni, Abdelmajid, editor, and Tadrist, Lounès, editor

Published
2024
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4. Thermal performance improvement of a heat sink using phase change materials and fins.

Author

Briache, Ayoub, Afass, Ayoub, Ouardouz, Mustapha, Ahachad, Mohammed, and Mahdaoui, Mustapha

Subjects
*HEAT sinks, *HEAT transfer fluids, *PHASE change materials, *FINS (Engineering), *ELECTRONIC systems, *ELECTRONIC equipment, *THERMAL conductivity
Abstract

This study proposes an investigation on the performance of a passive cooling system of electronic equipment, with a heat sink that has different numbers of fins with a constant volume fraction of fin thickness and integrating a phase change material. A numerical study was carried to simulate conjugate solid-fluid heat transfer, which is performed by using finite volume-based commercial Ansys Fluent software, characteristic parameters, such as melting period, the heat sink base temperature, and the number and spacing of fins, were investigated. The results showed that the heat sink with four fins has the highest thermal conductivity enhancement, and a lower base temperature compared to the other cases, i.e., two, three, and without fins. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Investigation of a buoyant bubble motion in a wall-driven square cavity

Author

Universitat Politècnica de Catalunya. Departament de Mecànica de Fluids, Universitat Politècnica de Catalunya. CATMech - Centre Avançat de Tecnologies Mecàniques, Afass, Ayoub, Bergadà Granyó, Josep Maria, Derfoufi, Soufiane, Ahachad, Mohammed, Mahdaoui, Mustapha, Universitat Politècnica de Catalunya. Departament de Mecànica de Fluids, Universitat Politècnica de Catalunya. CATMech - Centre Avançat de Tecnologies Mecàniques, Afass, Ayoub, Bergadà Granyó, Josep Maria, Derfoufi, Soufiane, Ahachad, Mohammed, and Mahdaoui, Mustapha

Abstract

Direct steam generation is considered as a potential substitute for conventional power generation technologies, for its advantageous characteristics. It can be directly powered by solar radiation by concentrating it on a specific point, besides eliminating heat exchangers and fluid refrigerant, which allows to reduce operating costs. It is crucial, to properly grasp the two-phase flow involved in these technologies. In this paper, we numerically explore the effect of flow strength and wall-driven position on the flow structure and dynamic behavior of bubbles in a square enclosure, through employing the Boltzmann pseudopotential lattice method. The terminal position of the bubble reflects the concurrence between the existing forces. When the value of the Reynolds number exceeds 600, the fluid flow strength overcomes buoyancy and pushes the bubble towards the center of the primary vortex, regardless of the wall-driven configuration. In terms of flow structure, wall-driven flow structures dominate the square cavity in all studied cases. The wall motion configuration affects the bubble trajectory, especially the left wall-driven case where the bubble only reaches the second quarter of the cavity height before being driven toward the center of the primary vortex. Note that the wall configuration has a strong impact on bubble trajectory for equal Reynolds values, Postprint (published version)

Published
2022

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