论文标题
使用单个无源屏障的雷利 - 贝纳德对流中的传热增强
Heat transfer enhancement in Rayleigh-Bénard convection using a single passive barrier
论文作者
论文摘要
在这项关于Rayleigh-Bénard对流的数值研究中，我们试图通过被动手段改善传热。为此，我们引入了一个以纵横比一个单元为中心的单个倾斜导电屏障，打破了几何形状的对称性，并引导上升的热和下降的冷羽。我们研究了全球和本地传热和雷利数字的流动组织$ 10^5 \ leq ra \ leq 10^9 $，用于固定的prandtl $ pr = 4.3 $。我们发现，全球热传输最多可提高$ 18 \％$，在本地约为$ 800 \％$。当引入屏障时，即使对于那些增加了全球传热的情况，平均雷诺数总是会减少。我们绘制由$ ra = 10^8 $的方向和大小跨越的整个参数空间。
In this numerical study on Rayleigh-Bénard convection we seek to improve the heat transfer by passive means. To this end we introduce a single tilted conductive barrier centered in an aspect ratio one cell, breaking the symmetry of the geometry and to channel the ascending hot and descending cold plumes. We study the global and local heat transfer and the flow organization for Rayleigh numbers $10^5 \leq Ra \leq 10^9$ for a fixed Prandtl number of $Pr=4.3$. We find that the global heat transfer can be enhanced up to $18\%$, and locally around $800\%$. The averaged Reynolds number is always decreased when a barrier is introduced, even for those cases where the global heat transfer is increased. We map the entire parameter space spanned by the orientation and the size of a single barrier for $Ra=10^8$.
