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首页> 外文期刊>Journal of enhanced heat transfer >ENHANCED HEAT TRANSFER AND FLOW FEATURES IN A DUCT MOUNTED WITH VARIOUS RIBS
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ENHANCED HEAT TRANSFER AND FLOW FEATURES IN A DUCT MOUNTED WITH VARIOUS RIBS

机译：增强的传热和流量在安装有各种肋的管道中

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摘要

The present experimental work is a comprehensive study of heat transfer and flow field characteristics inside a rectangular duct integrated with ribs of variable cross sections on the bottom wall. Four kinds of rib configurations, i.e., square (Case 1), pentagonal (Case 2), trapezium (Case 3), and truncated prismatic (Case 4), were deployed in the cooling passage to improve the thermal performance. The optical techniques, i.e., particle image velocimetry for flow field measurements and liquid crystal thermography for surface temperature measurements, were used to obtain reliable and accurate information about the flow and heat transfer features without disturbing the actual flow conditions. Transient experiments were conducted at a typical Reynolds number value, i.e., 42,500. The influence of the rib configurations and their relative spacing (P/e = 8, 10, and 12) were studied through the mapping of local- and spanwise-averaged enhanced heat transfer. Furthermore, the thermal performance parameters (overall Nusselt number augmentation, friction factor ratio, and thermohydraulic performance) are discussed in detail to select the best rib design. The truncated prismatic rib provided the best values of the thermal (27.91%), friction (32.75%), and thermohydraulic performance (45.16%) at P/e = 8, P/e = 12, and P/e = 8, respectively, when compared with square ribs. Moreover, the reasons for the variations in the heat transfer distribution inside the ribbed passages are elucidated through the flow structure information (mean velocities, mean streamlines, fluctuation statistics, mean vorticity, and turbulent intensity) at a relative spacing of 12. The heat transfer results are in harmony with the flow features, which helps in understanding the fundamental heat transfer mechanism.
机译：本实验工作是对集成矩形管道内的传热和流场特性的综合研究，该矩形管道与底壁上的可变横截面的肋条集成。在冷却通道中部署了四种肋配置，即正方形（壳体1），五角形（壳体2），五角形（壳体2），梯形（壳体3），并截断棱柱形（壳体4），以提高热性能。用于流场测量和表面温度测量的流场测量和液晶热成像的光学技术，用于获得有关流动和传热特征的可靠和准确的信息，而不会扰乱实际流动条件。瞬态实验在典型的雷诺数值下进行，即42,500。通过绘制局部和跨越平均增强的传热来研究肋骨配置及其相对间隔（P / E = 8,10和12）的影响。此外，详细讨论了热性能参数（整体露天的数量增强，摩擦因子比和热液压性能）以选择最佳肋设计。截短的棱镜肋提供了P / E = 8，P / E = 12和P / E = 8的热（27.91％），摩擦（32.75％）和热液态效果（45.16％）的最佳值，与方形肋骨相比。此外，在相对间隔为12的流动结构信息（平均速度，平均流线，波动统计，平均旋转和湍流统计，平均涡流和湍流统计，平均涡流和湍流和湍流，涡流统计，平均涡流和湍流强度），阐明了肋状通道内的传热分布的变化的原因。传热结果与流动特征和谐相处，有助于了解基本的传热机制。

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