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Effect of Aspect Ratio on Natural Convection in a Cavity with Wavy Walls

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Arici M., Kan M., Karabay H.
Acta Physica Polonica A
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2015
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vol. 128
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issue 2B
B-197-B-200
EN
In this study, flow characteristics and natural convection in a cavity with two wavy walls is studied numerically. The wavy walls of the cavity are isothermal and at different temperatures while other straight walls are adiabatic. The fluid considered inside the cavity is air having Prandtl number of 0.71. A parametric study is conducted for various aspect ratios (1 ≤ AR ≤ 5), Rayleigh numbers (10³ ≤ Ra_{H} ≤ 10⁶) and inclination angles (0° ≤ θ ≤ 180°). Streamlines, isotherms and local and mean Nusselt numbers are presented to show the effect of the investigated parameters on the flow field and heat transfer.
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Experimental Modelling of Czochralski Melt Flow with a Slow Crystal Dummy Rotation

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Haslavsky V., Gelfgat A., Kit E.
Acta Physica Polonica A
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2013
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vol. 124
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issue 2
193-197
EN
This study examines the effect of slow crystal dummy rotation on three-dimensional oscillatory instability and time-dependent supercritical flow states in a Czochralski melt flow experimental model. To enable further comparison with numerical modelling, the experiments are carried out using a 20 cSt silicone oil as an experimental liquid and in a large diameter crucible, which allows one to work in a narrow temperature interval, so that temperature dependence of all the thermophysical properties of the experimental liquid can be neglected. The measurements confirm, partially qualitatively and partially quantitatively, earlier numerical predictions on destabilization ofthe Czochralski convective flow by a slow rotation. A simple power dependence of flow oscillations frequency on the Grashof and rotational Reynolds numbers that fits all the experimental runs was found.
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