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首页> 外文期刊>International Journal of Heat and Mass Transfer >FLOW TRANSITIONS IN LAMINAR RAYLEIGH-BENARD CONVECTION IN A CUBICAL CAVITY AT MODERATE RAYLEIGH NUMBERS
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FLOW TRANSITIONS IN LAMINAR RAYLEIGH-BENARD CONVECTION IN A CUBICAL CAVITY AT MODERATE RAYLEIGH NUMBERS

机译：中等腔数下立方腔中层状瑞利贝纳德对流的流变

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摘要

A three-dimensional numerical study of the natural convection in a cubical cavity heated from below is reported at moderate Rayleigh numbers for three Prandtl numbers Pr=0.71,10and 130. The six walls are considered rigid and immobile, with isothermal horizontal plates and adiabatic lateral walls. The Boussinesq approximation for the variation of physical properties is assumed. Seven different structures, four single roll-type, two four roll-type and a toroidal roll, and several flow transitions have been identified in the steady and laminar regime for Ra≤6 x10~4 and Pr≤130. Both, teh dynamic and heat transfer characteristics of these seven structures are discussed. The effects of slightly changing the aspect ratio or tiliting the cavity on the stability of the different structures are also analyzed. There is general agreement between the predicted average Nusselt number and available correlations for Rayleigh-Benard convection in rectangular enclosures and between two horizontal plates.
机译：在三个瑞氏数为Pr = 0.71,10和130的中等瑞利数下，报道了从下面加热的立方腔中自然对流的三维数值研究。六个壁被认为是刚性且不动的，具有等温水平板和绝热侧向墙壁。假设物理性质的变化为Boussinesq近似。在Ra≤6x10〜4和Pr≤130的稳态和层流状态下，已经确定了七个不同的结构，四个单辊型，两个四个辊型和一个环形辊，以及几个流动过渡。讨论了这七个结构的动态和传热特性。还分析了略微改变纵横比或倾斜空腔对不同结构的稳定性的影响。在矩形封闭空间和两个水平板之间的瑞利-贝纳德对流的预测平均Nusselt数与可用相关性之间存在普遍的共识。

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