Natural convection indued by unintended horizontal temperature distribution in a narrow-closed container heated from above
Natural convection indued by unintended horizontal temperature distribution in a narrow-closed container heated from above
复制标题
从上方加热的狭窄密闭容器中意外水平温度分布引起的自然对流
DOI：
10.1016/j.ijheatmasstransfer.2021.122018
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发表时间：
2022
影响因子：
5.2
通讯作者：
Yuko Inatomi，Ichiro Ueno
中科院分区：
文献类型：
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作者：
Isamu Orikasa;Takuma Osada;Shinsuke Suzuki;Yuko Inatomi，Ichiro Ueno
这项研究旨在将从上方加热的狭窄封闭容器中液体的速度场表示为容器尺寸的函数，以估计扩散占主导地位的条件。通过一系列实验，跟踪了示踪剂颗粒在准二维玻璃池中的示踪粒子在不同内宽W的空腔中的运动。示踪粒子的平均速度Vm e An随W值的减小而近乎线性地减小。我们发现，在从上方加热的封闭窄腔内，实现了意想不到的水平温差，从而导致了自然对流。我们推导了雷诺数和格拉索夫数之间的关联式，它们分别被描述为平均速度和意外水平温差的函数。在此基础上，提出了当前几何条件下的对流起始阈值。
This study aims at expressing the velocity fields of the liquids held in a narrow-closed container heated from above as a function of the dimensions of the container to estimate the diffusion-dominant condition. The motions of tracer particles in liquid salol held in a quasi-two-dimensional glass cell were tracked in cavities of various inner width W through the series of experiments. The mean velocity of the tracer particles, V m e a n, decreased almost linearly with the decrease in the values of W. Thermal flow fields were successfully reproduced by the series of numerical simulations. We found that the unintended horizontal temperature difference is realized, which induces the natural convection in the closed narrow cavity heated from above. We derived the correlation between the Reynolds and Grashof numbers, which are described as a function of the mean velocity and the unintended horizontal temperature difference, respectively. The threshold of the convection onset in the present geometry was then proposed.