Stability and Nusselt number scaling for inclined differentially heated cavity flow

Williamson, N., Armfield, S.W., Lin, Wenxian, and Kirkpatrick, M.P. (2016) Stability and Nusselt number scaling for inclined differentially heated cavity flow. International Journal of Heat and Mass Transfer, 97. pp. 787-793.

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Abstract

The flow within inclined differentially side heated square cavities is investigated with two-dimensional numerical simulations. The cavity is inclined such that the heated wall is below the cooled wall. The angle of inclination is varied from theta=0°, which produces the standard differentially heated cavity flow, up to 90° where Rayleigh Bernard flow exists. The variation in flow structure, flow stability and heat transfer is presented with angle of inclination and the Rayleigh number. Results have been obtained over Ra=10⁴ – 10⁸ with Pr=7. It is shown that when the cavity is inclined the flow structure is changed with attached jet/plumes forming adjacent to the adiabatic walls, rather than diffuse intrusions as for the non-inclined side heated cavity. At a specific angle of inclination, the flow undergoes a bifurcation so that the fully developed flow is unsteady and single mode, with a further increase in inclination leading to multimodal flow. The critical transition angle is shown to vary inversely with the Rayleigh number. A scaling relationship for the Nusselt number is proposed which approximates the effect of cavity inclination on total heat transfer.

Item ID: 43637
Item Type: Article (Refereed Research - C1)
Keywords: convection; numerical simulation; inclined differentially heated cavity flow; travelling waves; stability
ISSN: 1879-2189
Funders: Australian Research Council (ARC)
Date Deposited: 19 Apr 2016 23:21
FoR Codes: 09 ENGINEERING > 0915 Interdisciplinary Engineering > 091505 Heat and Mass Transfer Operations @ 60%
09 ENGINEERING > 0915 Interdisciplinary Engineering > 091501 Computational Fluid Dynamics @ 20%
09 ENGINEERING > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics @ 20%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 100%
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