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Investigation of the transition of natural convective flow of water in a differentially heated cubic enclosure

机译：Investigation of the transition of natural convective flow of water in a differentially heated cubic enclosure

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ABSTRACT The present study aims at the investigation of the transition of the natural convective flow in a water-filled differentially heated cubic enclosure. The schlieren-particle image velocimetry (PIV) system has been developed and employed for simultaneous measurement of ray-averaged velocity and temperature fields from transient schlieren images for distinct Rayleigh number (Ra) (1?×?107 ≤?Ra ≤ 5?×?108). The experimentally obtained results have been compared with three-dimensional computational results. The three-dimensional incompressible simulations are carried out for a wide range of Ra (1?×?105 ≤?Ra ≤ 5?×?108), treating the density difference using Boussinesq approximation. The results from present simulations show that the flow is found steady in the range of Ra (1?×?105 ≤?Ra ≤ 1?×?108) while the critical Ra, at which the steady flow becomes unsteady, lies between 1?×?108 and 5?×?108. The critical Ra from the experiments is found to lie between 4?×?108 and 5?×?108. Also, the three-dimensionality effect on large-scale temperature field is found to decrease as Ra increases.

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