Transition to an unsteady flow induced by a fin on the sidewall of a differentially heated air-filled square cavity and heat transfer

Xu, Feng & Saha, Suvash C (2014) Transition to an unsteady flow induced by a fin on the sidewall of a differentially heated air-filled square cavity and heat transfer. International Journal of Heat and Mass Transfer, 71, pp. 236-244.

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Abstract

The transition from a steady to an unsteady flow induced by an adiabatic fin on the sidewall of a differentially heated air-filled cavity is numerically investigated. Numerical simulations have been performed over the range of Rayleigh numbers from Ra = 105–109. The temporal development and spatial structures of natural convection flows in the cavity with a fin are described. It has been demonstrated that the fin may induce the transition to an unsteady flow and the critical Rayleigh number for the occurrence of the transition is between 3.72 × 106 and 3.73 × 106. Furthermore, the peak frequencies of the oscillations triggered by different mechanisms are obtained through spectral analysis. It has been found that the flow rate through the cavity with a fin is larger than that without a fin under the unsteady flow, indicating that the fin may improve the unsteady flow in the cavity.

Impact and interest:

4 citations in Scopus
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3 citations in Web of Science®

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ID Code: 88493
Item Type: Journal Article
Refereed: Yes
Keywords: Steady flow;, Unsteady flow, Fin, Air-filled cavity
DOI: 10.1016/j.ijheatmasstransfer.2013.12.019
ISSN: 1879-2189
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 19 Oct 2015 05:25
Last Modified: 19 Oct 2015 05:25

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