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Prikladnaya Mekhanika i Tekhnicheskaya Fizika, 2013, Volume 54, Issue 6, Pages 60–68
(Mi pmtf1121)
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This article is cited in 13 scientific papers (total in 13 papers)
Entropy generation and natural convection in square cavities with wavy walls
S. Morsli, A. Sabeur-Bendehina Universite des Sciences et de la Technologie Mohamed Boudiaf Oran (USTO), Oran, Algérie
Abstract:
The aim of the present work is to study the entropy generation in the natural convection process in square cavities with hot wavy walls through numerical simulations for different undulations and Rayleigh numbers, while keeping the Prandtl number constant. The results show that the hot wall geometry affects notably the heat transfer rate in the cavity. It has been found in the present numerical study that the mean Nusselt number in the case of heat transfer in a cavity with wavy walls is lower, as compared to heat transfer in a cavity without undulations. Based on the obtained dimensionless velocity and temperature values, the distributions of the local entropy generation due to heat transfer and fluid friction, the local Bejan number, and the local entropy generation are determined and plotted for different undulations and Rayleigh numbers. The study is performed for Rayleigh numbers $10^3<\mathrm{Ra}<10^5$, irreversibility coefficients $10^{-4}<\varphi<10^{-2}$, and Prandtl numbers $\mathrm{Pr}=0.71$. The total entropy generation is found to increase with increasing undulation number.
Keywords:
natural convection, undulated cavity, entropy generation, Bejan number.
Received: 08.08.2012
Citation:
S. Morsli, A. Sabeur-Bendehina, “Entropy generation and natural convection in square cavities with wavy walls”, Prikl. Mekh. Tekh. Fiz., 54:6 (2013), 60–68; J. Appl. Mech. Tech. Phys., 54:6 (2013), 913–920
Linking options:
https://www.mathnet.ru/eng/pmtf1121 https://www.mathnet.ru/eng/pmtf/v54/i6/p60
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