格拉晓夫数Gr对侧向局部加热腔体内对流结构的影响

发布时间：2018-04-05 07:12

  本文选题：侧向局部加热　切入点：周期性　出处：《力学季刊》2016年01期

【摘要】：通过二维流体力学基本方程组数值模拟,研究了Pr=6.949时侧向局部加热腔体内不同格拉晓夫数Gr对对流结构的影响.发现随着格拉晓夫数Gr增加出现以下四种情况:准定常流→单局部周期滚动→双局部周期滚动→定常流.还分析了周期对流阶段的对流特性.随着格拉晓夫数Gr增大,对流卷随时间移动的周期减小.随Gr增大,在0≤≤Y 5.2和0.5≤≤Y 5.7范围内对流卷逐渐消失,在5.2≤≤Y5和5.7≤≤Y10范围内对流卷由单对流卷变为多对流卷.
[Abstract]:The effects of different Graschev numbers Gr on the convection structure in a laterally heated cavity with Pr6.949 were studied by numerical simulation of the basic equations of two-dimensional hydrodynamics.It is found that with the increase of Graschev number Gr there are four cases: quasi steady flow with single local periodic rolling and double local periodic rolling steady flow.The convection characteristics of periodic convection are also analyzed.With the increase of Gr, the period of convection volume moving with time decreases.With the increase of Gr, the convection volume gradually disappears in the range of 0 鈮，

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