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2. Comparison Between Physical and Thermal Properties of Raw and Treated Posidonia Oceania Leaves

Author

Mehrez, Insaf, Hachem, Houda, Gheith, Ramla, Jemni, Abdelmajid, 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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7. Contributors

Author

Abudula, Abuliti, primary, Afshari, Ebrahim, additional, Agelin-Chaab, Martin, additional, Al-Muhammad, Jafar, additional, Aloui, Fethi, additional, Amirhaeri, Yasaman, additional, Arslan, Oğuzhan, additional, Arumuru, V., additional, Asghari, Saeed, additional, Bansal, Sidharth, additional, Bayat, Mutlucan, additional, Berrich, Emna, additional, Birth, Torsten, additional, Birtürk, Aslı, additional, Buonomenna, Maria Giovanna, additional, Çeliktaş, Melih Soner, additional, Chandrasekar, M., additional, Chen, Ming, additional, Chen, Siqi, additional, Dai, Haifeng, additional, Das, M.K., additional, Daşdemirli, Yakup, additional, Delacourt, Éric, additional, El Idi, Mohamed Moussa, additional, Ergün, Alper, additional, Feng, Zixiao, additional, Gheith, Ramla, additional, Ghomashchi, Reza, additional, Guan, Guoqing, additional, Guo, Zhechen, additional, Hachem, Houda, additional, Hadavi, Hamed, additional, Ijam, Ali, additional, Jahantigh, Nabi, additional, Jiang, Zhengyong, additional, Karaağaç, Mehmet Onur, additional, Karkri, Mustapha, additional, Kaskun Ergani, Songül, additional, Kayfeci, Muhammet, additional, Keçebaş, Ali, additional, Keskin, Tugba, additional, Kumar, Parvesh, additional, Li, Xianglin, additional, Liu, Yuanxin, additional, Liu, Zhao, additional, Mafat, Iradat Hussain, additional, Malhotra, Abhishek, additional, Mameri, Fateh, additional, Mei, Xuesong, additional, Morin, Céline, additional, Nandan, R., additional, Patel, Aarsh, additional, Patel, Jay R., additional, Pourfayaz, Fathollah, additional, Rathod, Manish K., additional, Romdhane, Mehrez, additional, Salhi, Mansoura, additional, Sams, Michael W., additional, Saravanan, C.G., additional, Saxena, Rajat, additional, Scheffler, Marcel, additional, Shahid, Seham, additional, Shamsizadeh, Pedram, additional, Shao, Keke, additional, Soltani, Ilham, additional, Song, Mengjie, additional, Sonthalia, Ankit, additional, Stallard, Silven, additional, Abdou Tankari, Mahamadou, additional, Uysal, Ali, additional, Varuvel, Edwin Geo, additional, Wang, Xingzao, additional, Wei, Xuezhe, additional, Wu, Mingtao, additional, Xiao, Liusheng, additional, Xu, Jun, additional, Xu, Yuan, additional, Xu, Ziming, additional, Yıldız, Gökhan, additional, You, Hongxin, additional, Yuan, Jinliang, additional, Zaferani, Sadeq Hooshmand, additional, Zhang, Long, additional, Zhang, Xuan, additional, Zhao, Jiapei, additional, and Zheng, Jianmin, additional

Published
2023
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21. 4.6 Stirling Engines

Author

Gheith, Ramla, primary, Hachem, Houda, additional, Aloui, Fethi, additional, and Ben Nasrallah, Sassi, additional

Published
2018
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29. Optimization of Mortar/Agave americana Fibers Composite Behavior Based on Experimental Design.

Author

Mehrez, Insaf, Hachem, Houda, Gheith, Ramla, and Jemni, Abdelmajid

Subjects
*MORTAR, *FIBROUS composites, *AGAVES, *EXPERIMENTAL design, *MANUFACTURING processes, *COMPOSITE material manufacturing
Abstract

Processing parameters and manufacturing techniques of composite materials have a considerable impact on the physicomechanical properties of a final product. The innovative contribution of the current work was to optimize the preparation process of composite materials to obtain the best physicomechanical properties. The mechanical characteristics and the water absorption uptake of mortar/unidirectional Agave americana fibers composite were optimized using an experimental design approach (statistical analysis). A central composite design was considered to determine the optimum preparation conditions of the mortar/A. americana composite to ensure the highest mechanical properties and lowest moisture effect. A second-order polynomial model was developed. The results show that both parameters and their interactions significantly affect the composite’s compressive strength, water absorption uptake, and stress strain. However, only the two studied parameters have a significant effect on flexural strength response. The optimal properties of the composite are 11.14 MPa, 2.03 mm, 3.88 MPa, 0.93 mm, and 14.6%, respectively, for compressive strength, stress strain, flexural strength, displacement, and water absorption. These properties are obtained at specific processing parameters, respectively, 17.6Ve% of agave fibers loading and 4.2% sodium hydroxide fibers treatment solution concentration. The adequate treatment process was proven when testing fibers morphology (Scanning electron microscopy) and their crystallinity index (X-ray diffraction). [ABSTRACT FROM AUTHOR]

Published
2023
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32. Stirling Engines

Author

Gheith, Ramla, Hachem, Houda, Aloui, Fethi, Ben Nasrallah, Sassi, Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201 (LAMIH), and Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Centre National de la Recherche Scientifique (CNRS)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France)

Subjects
Heat transfer, Experimental design methodology, Numerical methods, [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], Stirling engine, Experimental optimization
Abstract

International audience; The Stirling engine is mainly composed by five compartments: two working spaces and three heat exchangers (heater, cooler, and regenerator). The regenerator (porous medium) characteristics, especially material and porosity, are determinant for the whole engine performance. In order to choose the adequate regenerator, numerical and experimental methods can be adopted. Numerical models, i.e., isothermal, adiabatic, and quasi steady, are applied to determine the engine performances considering the regenerator parameters. The most powerful numerical tool is the computational fluid dynamics (CFD) simulation, which allows a detailed examination of flow behavior through the porous media. The one-variate experimental method is generally considered to test regenerator operation in the Stirling engine but the figure of merit (FOM) formulation and the experimental design methodology are more precise and faster to compare several regenerators performances.

Published
2018

35. Simulation CFD des échangeurs de chaleur dans un moteur Stirling à Double effet

Author

Gheith, Ramla, Frikha, Mohamed, Hachem, Houda, Aloui, Fethi, Ben Nasrallah, Sassi, Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201 (LAMIH), and Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Centre National de la Recherche Scientifique (CNRS)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France)

Subjects
[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

36. Exergy assessment of heat transfer inside a Beta type Stirling engine

Author

Hachem, Houda, Gheith, Ramla, Aloui, Fethi, Ben Nasrallah, Sassi, Dincer, Ibrahim, École Nationale d’Ingénieurs de Monastir (ENIM), Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201 (LAMIH), Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Centre National de la Recherche Scientifique (CNRS)-INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France), University of Ontario Institute of Technology (UOIT), and University of Western Ontario (UWO)

Subjects
"Stirling engine", "exergy efficiency", "external losses", "energy efficiency", "exergy destruction", [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]
Abstract

IF=1.377; International audience; This paper presents an assessment of both energy and exergy efficiencies of a Beta Stirling engine prototype with a 30 W capacity as the maximum mechanical power output. Its operating pressure is close to atmospheric pressure, and it supports a maximum hot end temperature of 650 degrees C. The prototype is experimented with and without thermal insulation of its two heat sources. Exergy destructions are quantified and analysed, and their causes are explained. The effects of external losses and their reduction on energy and exergy efficiencies are investigated. Furthermore, the effects of rotational speed on the performances of the engine were investigated and their relations with temperature and pressure drop are illustrated.

Published
2016

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