Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with
Numerical computation of unsteady laminar three-dimensional natural convection and entropy generation in an inclined cubical trapezoidal air-filled cavity is performed for the first time in this work. The vertical right and left sidewalls of the cavity are maintained at constant cold temperatures. T...
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| Format: | Article |
| Language: | English |
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Elsevier
2016-06-01
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| Series: | Alexandria Engineering Journal |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110016816000089 |
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| author | Ahmed Kadhim Hussein Kolsi Lioua Ramesh Chand S. Sivasankaran Rasoul Nikbakhti Dong Li Borjini Mohamed Naceur Ben Aïssia Habib |
| author_facet | Ahmed Kadhim Hussein Kolsi Lioua Ramesh Chand S. Sivasankaran Rasoul Nikbakhti Dong Li Borjini Mohamed Naceur Ben Aïssia Habib |
| author_sort | Ahmed Kadhim Hussein |
| collection | DOAJ |
| description | Numerical computation of unsteady laminar three-dimensional natural convection and entropy generation in an inclined cubical trapezoidal air-filled cavity is performed for the first time in this work. The vertical right and left sidewalls of the cavity are maintained at constant cold temperatures. The lower wall is subjected to a constant hot temperature, while the upper one is considered insulated. Computations are performed for Rayleigh numbers varied as 103 ⩽ Ra ⩽ 105, while the trapezoidal cavity inclination angle is varied as 0° ⩽ Φ ⩽ 180°. Prandtl number is considered constant at Pr = 0.71. Second law of thermodynamics is applied to obtain thermodynamic losses inside the cavity due to both heat transfer and fluid friction irreversibilities. The variation of local and average Nusselt numbers is presented and discussed, while, streamlines, isotherms and entropy contours are presented in both two and three-dimensional pattern. The results show that when the Rayleigh number increases, the flow patterns are changed especially in three-dimensional results and the flow circulation increases. Also, the inclination angle effect on the total entropy generation becomes insignificant when the Rayleigh number is low. Moreover, when the Rayleigh number increases the average Nusselt number increases. |
| first_indexed | 2024-12-21T20:08:42Z |
| format | Article |
| id | doaj.art-5e2d4e8c8f1f4d6e9c8a3b42fc989b8d |
| institution | Directory Open Access Journal |
| issn | 1110-0168 |
| language | English |
| last_indexed | 2024-12-21T20:08:42Z |
| publishDate | 2016-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Alexandria Engineering Journal |
| spelling | doaj.art-5e2d4e8c8f1f4d6e9c8a3b42fc989b8d2022-12-21T18:51:47ZengElsevierAlexandria Engineering Journal1110-01682016-06-0155274175510.1016/j.aej.2016.01.004Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity withAhmed Kadhim Hussein0Kolsi Lioua1Ramesh Chand2S. Sivasankaran3Rasoul Nikbakhti4Dong Li5Borjini Mohamed Naceur6Ben Aïssia Habib7College of Engineering, Mechanical Engineering Department, Babylon University, Babylon City, Hilla, IraqUnité de recherche de Métrologie et des Systèmes Énergétiques, College of Engineering of Monastir, Energy Engineering Department, University of Monastir, TunisiaDepartment of Mathematics, Government P.G. College, Dhaliara 177103, Himachal Pradesh, IndiaInstitute of Mathematical Sciences, University of Malaya, Kuala Lumpur 50603, MalaysiaFaculty of Engineering, Ferdowsi University of Mashhad, P.O. Box No. 91775-1111, Mashhad, IranSchool of Architecture and Civil Engineering, Northeast Petroleum University, Fazhan Lu Street, Daqing 163318, ChinaUnité de recherche de Métrologie et des Systèmes Énergétiques, College of Engineering of Monastir, Energy Engineering Department, University of Monastir, TunisiaUnité de recherche de Métrologie et des Systèmes Énergétiques, College of Engineering of Monastir, Energy Engineering Department, University of Monastir, TunisiaNumerical computation of unsteady laminar three-dimensional natural convection and entropy generation in an inclined cubical trapezoidal air-filled cavity is performed for the first time in this work. The vertical right and left sidewalls of the cavity are maintained at constant cold temperatures. The lower wall is subjected to a constant hot temperature, while the upper one is considered insulated. Computations are performed for Rayleigh numbers varied as 103 ⩽ Ra ⩽ 105, while the trapezoidal cavity inclination angle is varied as 0° ⩽ Φ ⩽ 180°. Prandtl number is considered constant at Pr = 0.71. Second law of thermodynamics is applied to obtain thermodynamic losses inside the cavity due to both heat transfer and fluid friction irreversibilities. The variation of local and average Nusselt numbers is presented and discussed, while, streamlines, isotherms and entropy contours are presented in both two and three-dimensional pattern. The results show that when the Rayleigh number increases, the flow patterns are changed especially in three-dimensional results and the flow circulation increases. Also, the inclination angle effect on the total entropy generation becomes insignificant when the Rayleigh number is low. Moreover, when the Rayleigh number increases the average Nusselt number increases.http://www.sciencedirect.com/science/article/pii/S1110016816000089Transient natural convectionTrapezoidal cavityThree-dimensional flowEntropy generationSecond law analysis |
| spellingShingle | Ahmed Kadhim Hussein Kolsi Lioua Ramesh Chand S. Sivasankaran Rasoul Nikbakhti Dong Li Borjini Mohamed Naceur Ben Aïssia Habib Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with Alexandria Engineering Journal Transient natural convection Trapezoidal cavity Three-dimensional flow Entropy generation Second law analysis |
| title | Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with |
| title_full | Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with |
| title_fullStr | Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with |
| title_full_unstemmed | Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with |
| title_short | Three-dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with |
| title_sort | three dimensional unsteady natural convection and entropy generation in an inclined cubical trapezoidal cavity with |
| topic | Transient natural convection Trapezoidal cavity Three-dimensional flow Entropy generation Second law analysis |
| url | http://www.sciencedirect.com/science/article/pii/S1110016816000089 |
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