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结合对流传热场协同原理分析了微酒窝通道、圆柱面凹槽通道及低肋通道强化传热特点,研究发现酒窝与圆柱面凹槽强化传热主要原因为:1)增加近壁区流体扰动,促进酒窝或凹槽内部流体与主流之间的传热;2)酒窝与凹槽均可扩展传热面积,进而提高总传热量。与低肋通道相比,酒窝与圆柱面凹槽仅对其附近流体的流动产生影响,而对主流流体的流动影响较小,进而阻力增加较少。提出传热量单元性能参数PEC_A作为评价指标,酒窝通道综合性能参数略高于圆柱面凹槽通道,而远高于低肋通道。
Combined with the synergistic principle of convective heat transfer field, the characteristics of heat transfer enhancement in dimple channel, cylindrical channel and low rib channel are analyzed. The main reasons for the enhanced heat transfer in dimple dimple are as follows: 1) , To promote dimples or grooves within the fluid and the mainstream heat transfer; 2) Dimples and grooves can be extended heat transfer area, thereby increasing the total heat transfer. Compared with the low-ribbed channel, dimples and cylindrical grooves affect the flow of fluid only in the vicinity of it, but have less influence on the flow of the mainstream fluid, and thus increase the resistance less. Proposed heat transfer unit performance parameters PEC_A as an evaluation index, dimple channel overall performance parameters slightly higher than the cylindrical groove channel, and much higher than the low rib channel.