Journal
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
Volume 70, Issue -, Pages 92-101Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2013.03.012
Keywords
Fin; Transition; Unsteady flow
Categories
Funding
- Australian Research Council, National Natural Science Foundation of China [11142015, 11272045]
- 111 Project [B13002]
- Fundamental Research Funds for the Central Universities [2011JBM360]
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In this study we investigate the transition from a steady flow to an unsteady flow induced by an adiabatic fin on the sidewall of a differentially heated cavity using numerical simulation. A range of Rayleigh numbers (10(6)-10(9)) and various fin lengths with Prandtl number 6.63 are considered. It is found that the flow adjacent to the finned sidewall is unsteady for the cases with Rayleigh numbers higher than a critical value for a given fin length. Such an unsteady flow results from a fluid layer above the fin with an adverse temperature gradient and a through flow, which is a similar mechanism to a Rayleigh-Benard-Poiseuille (RBP) flow, though the configuration is such that it cannot be exactly a RBP flow. The transition from a steady flow to an unsteady flow is sensitive to the fin length, and the critical values of the transition for the different fin lengths are obtained. Moreover, the features of the unsteady flow induced by the fin are characterized and the mechanisms responsible for the unsteadiness are discussed. (c) 2013 Elsevier Masson SAS. All rights reserved.
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