团队博士生张立玉关于整体曲率对周期性波状通道内流动传热特性影响的研究成果“A numerical analysis of fluid flow and heat transfer in wavy and curved wavy channels”发表于International Journal of Thermal Sciences期刊。

为开发更高效的紧凑型散热器，本文通过数值方法分别研究了传统波状通道与弯曲波状通道内的流动传热特性，分析了不同波幅下整体弯曲曲率对通道传热与阻力性能的影响，并基于场协同原理揭示了两种通道性能存在差异的原因。研究结果表明，当周期性波状结构的波幅为0.40mm和0.80mm时，弯曲波状通道的努塞尔数相比常规波状通道分别提高44.3%和15.3%；此外，研究结果显示工质在通道内的流动阻力对波长更敏感。当通道波幅给定时，弯曲波状通道内温度场与速度场的协同性相比传统波状通道更优。

To develop compact heatsinks with high heat transfer coefficient, the flow and heat transfer characteristics in the traditional wavy channel and the curved wavy channel were studied by numerical methods. The effects of the overall curvature on the heat transfer and resistance performance of the wavy channel under different amplitudes were analyzed, and the mechanism behind the difference in the performance between the two kinds of channels was revealed based on the field synergy principle. The results showed that the Nussel number in the curved wavy channel increases by 44.3% and 15.3% respectively against the conventional wavy channel for the given amplitudes of 0.40mm and 0.80mm. In addition, the results showed that the flow resistance is more sensitive to the wavelength. For a given amplitude, curved wavy channels always show a better field synergy than conventional wavy channels.

(a)                                                                             (b)

Fig. 1. The comparison between the conventional wavy channels and the curved wavy channels: (a) the ratio of Nusselt numbers (b) the ratio of friction factors.

Fig. 2. Overall field synergy angles in the convention wavy channels and the curved wavy channels with different amplitude.

论文链接：http://doi.org/10.1016/j.ijthermalsci.2021.107248