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- W2066792006 abstract "Abstract The temperature and velocity field in a horizontal convergent–divergent rectangular channel heated from below is studied experimentally for a Reynolds range 8–120, Grashof numbers from 0.44 × 10 5 to 2.56 × 10 5 and Richardson numbers from 3 to 4000, using water as working fluid. The duct aspect ratio (width/height) varies from 1 at its inlet to 2.28 at the stenosis neck, and both the upper and bottom walls are tilted with an angle of ±15.7° with respect to the horizontal. The temperature of the bottom wall is kept constant above that of the issuing fluid. The temperature field is recorded by liquid crystals in the vertical mid plane whereas the velocity field is measured in this plane as well as in four cross sections of the divergent passage by planar PIV, revealing the characteristics of the secondary velocity field. For all the examined cases the flow in the convergent passage is free of thermal plumes, and the thermal boundary layer is thin. In contrast, the divergent passage is characterized by a thermal plume which is shifted upstream with increasing Gr or reducing Re. Both transversal and longitudinal rolls emerge in this diffuser the strength of which depend on Re and Gr influencing the streamwise distribution of Nusselt which for low Re presents a minimum." @default.
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- W2066792006 date "2011-02-01" @default.
- W2066792006 modified "2023-09-26" @default.
- W2066792006 title "Mixed convection flow investigation in a rectangular horizontal tube stenosis via liquid crystal thermography and planar PIV" @default.
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- W2066792006 doi "https://doi.org/10.1016/j.expthermflusci.2010.10.008" @default.
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