Abstract An attempt is made to improve the overall performances of channel heat exchangers. The techniques of baffles and nanofluids are combined to enhance the dynamic and thermal behaviors within the channel exchanger. Baffles under various attack angles are used as vortex generators. In addition, oil/multiwalled carbon nanotubes (MWCNT) is used as a working fluid. Both inclinations in the upstream and downstream directions were considered, referenced as Case A (UIB) and Case B (BIB), respectively. While the channel equipped with vertical baffles is referenced as Case C. The proposed models with combined techniques allowed a considerable enhancement in the overall efficiency. The comparison between the three cases revealed that the most significant value of thermal enhancement factor (TEF) of 5.634 was reached with vertical baffles (Case C) at the highest value of Reynolds number. When using inclined baffles, the 75° upstream attack angle (Case A) allowed the highest TEF of 4.814, compared with Case B.

中文翻译：

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通过挡板技术和油/多壁碳纳米管纳米流体增强通道中的湍流对流传热

摘要 试图提高通道式换热器的整体性能。挡板和纳米流体技术相结合，以增强通道交换器内的动态和热行为。各种攻角下的挡板用作涡流发生器。此外，油/多壁碳纳米管 (MWCNT) 用作工作流体。考虑了上游和下游方向的倾斜度，分别称为案例 A (UIB) 和案例 B (BIB)。而配备垂直挡板的通道被称为案例 C。采用组合技术的建议模型允许显着提高整体效率。三种情况之间的比较表明，热增强因子 (TEF) 的最显着值为 5。使用最高雷诺数值的垂直挡板（案例 C）达到 634。当使用倾斜挡板时，与案例 B 相比，75° 的上游攻角（案例 A）允许最高的 TEF 为 4.814。