Flow Above a Heated Plate in an Ascending Current |
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| Authors: | A V Gudzovskii |
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| Institution: | (1) Division of Atmospheric Sciences, University of Helsinki, Helsinki, Finland;(2) Finnish Meteorological Institute, Helsinki, Finland;(3) Nansen Environmental and Remote Sensing Centre, Bjerknes Centre for Climate Research, Bergen, Norway;(4) Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel |
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| Abstract: | An analysis of the results of numerical experiments in which the two-dimensional flow near a plate placed across an ascending fluid current was simulated is presented. The plate temperature was higher than that of the fluid. Fluid flows with a Prandtl number 0.25  Pr 7 were considered on the moderate Reynolds and Richardson number ranges 25 < Re 100 and 0 Ri < 20. Under these conditions, two flow patterns were observable, which differed from each other by the intensity of the transverse oscillations of a system consisting of attached twin vortices and the near wake. For different Prandtl numbers, in the (Re, Ri1/2) plane the pattern stability boundaries were established, together with the distinctive features of pattern-to-pattern transition. It was found that the vortex arrangement in the wake above the heated plate can differ from that in the von Kàrmàn street in the absence of buoyancy |
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| Keywords: | vortex street thermal plume bifurcation hysteresis |
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