Heat transfer and fluid flow of natural convection along a vertical flat plate in the transition region: experimental analysis of the wall temperature field
Heat transfer and fluid flow of natural convection along a vertical flat plate in the transition region: experimental analysis of the wall temperature field
复制标题
过渡区垂直平板自然对流传热与流体流动：壁温场实验分析
DOI：
10.1016/0017-9310(95)00057-g
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发表时间：
1995
影响因子：
5.2
通讯作者：
K. Komori
中科院分区：
文献类型：
--
作者：
T. Inagaki;K. Komori
对竖直平板过渡段自然对流沿着流动和换热进行了实验研究。测量了竖直平板沿着向的局部换热系数，以区分第一过渡区。然后使用液晶片和水溶性荧光涂料可视化壁温和流体流动。还讨论了速度场和温度场的可视化的帮助下的特征统计量。实验结果表明，壁面上出现了马蹄形的低温区，在传热过程中起着重要作用。当数据被整体平均时，发现模式的特征时间和空间尺度在统计上不仅与热通量无关，而且与它们发生的位置无关。此外，在近壁区还出现了具有三维不稳定结构的W型流型。它们在层流到湍流的转变中起着重要的作用。
Heat transfer and fluid flow of natural convection along a vertical flat plate were experimentally investigated in the transition region. Local heat transfer coefficients along a vertical flat plate were measured to distinguish the first transition region. The wall temperature and fluid flow were then visualized using a liquid crystal sheet and water-soluble fluorescent paint. Also discussed are the characteristic statistical quantities with the aid of visualizations for the velocity and temperature fields. It was revealed from a series of experiments that horseshoe-shaped low-temperature patterns appear on the wall and that they play a significant role in heat transfer. When the data was ensemble-averaged it was found that the characteristic time-and-space scales of the patterns are statistically independent of not only heat flux but also the position in which they occur. Moreover, W-shaped flow patterns, which possess three-dimensional and unstable structures, appear in the near-wall region. They play a significant role in the laminar to turbulent transition.