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• W2593514092 abstract "The buoyancy-driven boundary-layer flow that develops over a semi-infinite inclined hot plate is known to become unstable at a finite distance from the leading edge, characterized by a critical value of the Grashof number Gr based on the local boundary-layer thickness. The nature of the resulting instability depends on the inclination angle ϕ, measured from the vertical direction. For values of ϕ below a critical value ϕc the instability is characterized by the appearance of spanwise traveling waves, whereas for ϕ>ϕc the bifurcated flow displays Görtler-like streamwise vortices. The Boussinesq approximation, employed in previous linear stability analyses, ceases to be valid for gaseous flow when the wall-to-ambient temperature ratio Θw is not close to unity. The corresponding non-Boussinesq analysis is presented here, accounting also for the variation with temperature of the different transport properties. A temporal stability analysis including nonparallel effects of the base flow is used to determine curves of neutral stability, which are then employed to delineate the dependences of the critical Grashof number and of its associated wave length on the inclination angle ϕ and on the temperature ratio Θw for the two instability modes, giving quantitative information of interest for configurations with Θw-1∼1. The analysis provides in particular the predicted dependence of the crossover inclination angle ϕc on Θw, indicating that for gaseous flow with Θw-1∼1 spanwise traveling waves are predominant over a range of inclination angles 0⩽ϕ⩽ϕc that is significantly wider than that predicted in the Boussinesq approximation." @default.
• W2593514092 created "2017-03-16" @default.
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• W2593514092 date "2017-06-01" @default.
• W2593514092 modified "2023-09-23" @default.
• W2593514092 title "Non-Boussinesq stability analysis of natural-convection gaseous flow on inclined hot plates" @default.
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• W2593514092 doi "https://doi.org/10.1016/j.ijheatmasstransfer.2017.02.010" @default.
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