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首页> 外文会议>American Society of Mechanical Engineers(ASME) Summer Heat Transfer Conference(HT2005); 20050717-22; San Francisco,CA(UA) >FREE CONVECTION IN AIR-FILLED CAVITY WITH A LOCALIZED HEATER FROM BELOW AND COOLING LATERAL WALLS
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FREE CONVECTION IN AIR-FILLED CAVITY WITH A LOCALIZED HEATER FROM BELOW AND COOLING LATERAL WALLS

机译：从下方冷却侧壁并用局部加热的加热器在空洞中自由对流

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摘要

The paper investigates the development of natural convection in air-filled square enclosure with a heat source flush mounted on the lower horizontal surface; the cavity is symmetrically cooled from the lateral walls. The experimental analysis has been carried out with the real time holographic interferometry that makes possible the investigation of the development of the convective phenomenon, and with the double exposure technique in order to obtain the temperature distribution inside the cavity at the steady-state. The experimental analysis allows the study of a limited range of Rayleigh numbers from about 1.63·10~4 to 2.8·10~5. On the contrary the numerical investigation makes possible to enlarge the analysis to a more wide range of Rayleigh numbers; thus the experimental analysis, has been integrated with the numerical results provided by the investigation with the commercial finite volume software Fluent 6.0. for Rayleigh number from 10~3to 10~6 Different convective forms have been obtained depending on Ra, on the heat source length and on its position. The Nusselt number has been evaluated on the heater; graphs with relations between average Nu, Ra, the heat source length and its position are finally presented.
机译：本文研究了在空气充填的方形外壳中自然对流的发展情况，该方形外壳中的热源齐平安装在下部水平表面上。空腔从侧壁对称地冷却。已经使用实时全息干涉术进行了实验分析，这使得能够研究对流现象的发展，并且已经使用二次曝光技术来获得稳态下的腔内温度分布。实验分析允许研究有限范围的瑞利数，范围从大约1.63·10〜4到2.8·10〜5。相反，数值研究使得将分析扩大到更大范围的瑞利数成为可能。因此，使用商业有限体积软件Fluent 6.0将实验分析与调查提供的数值结果集成在一起。对于瑞利数在10〜3到10〜6之间的关系，根据Ra，热源长度及其位置，获得了不同的对流形式。已在加热器上评估了努塞尔数；最后给出了具有平均Nu，Ra，热源长度及其位置之间的关系的曲线图。

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