Natural convection and heat transfer on a section-triangular roof

Zhai, Haoyu; Xu, Feng; Saha, Suvash C.

doi:10.1016/j.icheatmasstransfer.2018.02.007

Cited by 12 publications

(1 citation statement)

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“…However, less attention has been paid to fundamental research in ow dynamics and heat transfer. Our previous theoretical studies predict the mechanism of dynamics and heat transfer for the ow over the roof in laminar regimes under different heating condition [19,17] and subsequent ow bifurcations with increasing of Rayleigh number (Ra) [18]. However, the static wind condition used in these theoretical studies is not achievable in buildings surrounded by an atmospheric boundary layer.…”

Section: Introductionmentioning

confidence: 99%

Visualisation and measurement of a laminar boundary layer on the surface of an isothermal section-triangular roof

Zhai

Torres

Zhao

et al. 2021

Preprint

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Natural convection in air over a heated section-triangular roof with a fixed aspect ratio of 0.1 is experimentally investigated. The development of the flow over the roof subject to a range of temperatures is measured by digital interferometry and thermocouples. The experiments present distinct images of the thermal boundary layer, which changes from a quasi-steady to an unsteady state as the surface temperature of the triangular roof increases. Contrary to numerical simulations previously published, the observed flow becomes unsteady, which is very likely influenced by uncontrolled perturbations at the critical Rayleigh number where a pitchfork bifurcation of a steady flow is theoretically expected.

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Section: Introductionmentioning

confidence: 99%