B313 臨界点近傍流体中の対流不安定性と熱伝達

概要

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We study convective instabilities and heat transfer induced in a near-critical fluid of CO_2 experimentally. The system which we investigate is as follows : CO_2 near the critical point, the temperature of which is slightly higher than the critical temperature, is confined between two horizontal plates. The temperature of the bottom plates is raised but the top plate is not heated nor cooled. The mode of convection induced in the system is investigated by visualising the temperature field by the Schlieren method. The following results were obtained through the experiment : (1) thermal plumes are induced not only upwards from the bottom thermal boundary layer but also from the top thermal boundary layer although the top surface is not cooled. (2) The wave number in the onset of the upward plumes becomes larger as the system temperature becomes closer to the critical point. (3) The heat transfer coefficient also becomes larger as the temperature reaches the critical point.
日本流体力学会の論文
2002-07-23