水平円筒内空気の非定常二次元自然対流 : 第1報,流れの特徴

概要

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Two-dimensional transient free convection in a horizontal circular cylinder, which occurs when the pressure inside the cylinder is decreased stepwise, was studied experimentally. The pattern and the velocity of free convection were studied using a flow visualization technique and Laser Doppler Velocimeter. The range of the Grashof number (based on the radius of the cylinder) covered in the experiment was from 10^3 to 5× 10^5. The flow is accelerated at first and then decelerated. The acceleration period becomes short with increasing Gr. The velocity of convection increases with increasing Gr. In a high Gr case, the central flow velocity is known to oscillate in the deceleration phase. The oscilation is estimated to be caused by the rolling up of the shear layer developped by the rising flow near the cylinder wall and by the hot air rising along the wall and descending through the central part.
一般社団法人日本機械学会の論文
1987-08-25