Natural convection in a cavity with time-dependent flux boundary

Zhou, Linjing, Armfield, Steven, Williamson, Nicholas, Kirkpatrick, Michael, and Lin, Wenxian (2021) Natural convection in a cavity with time-dependent flux boundary. International Journal of Heat and Fluid Flow, 92. 108887.

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Abstract

Numerical simulations have been carried out to investigate the unsteady natural convection flow in a cavity subjected to a sidewall heat flux varying sinusoidally with time. With all walls non-slip and the upper and lower boundaries and the other sidewall adiabatic, the heating and cooling produces an alternating direction natural convection boundary layer that discharges hot fluid to the top and cold fluid to the bottom of the cavity, generating a time-varying thermal stratification in the cavity interior. Scaling analysis has been conducted for different flow regimes based on the forcing frequency, with the characteristic time scales being the forcing period and the boundary layer development time. The scaling relations are then verified using the simulations, with the results showing overall good agreement with the derived scaling relations.

Item ID: 71170
Item Type: Article (Scholarly Work)
ISSN: 1879-2278
Keywords: Natural convection flow; Numerical simulation; Heat transfer
Copyright Information: © 2021 Elsevier Inc. All rights reserved.
Funders: Australian Research Council (ARC)
Projects and Grants: ARC Discovery Project DP130100900
Date Deposited: 07 Jun 2022 03:24
FoR Codes: 40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401204 Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics) @ 60%
40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401207 Fundamental and theoretical fluid dynamics @ 40%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering @ 100%
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