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本文采用Mach-Zehnder干涉技术研究了自然对流冷却条件下水平和倾斜放置时非等温矩形肋片通道的流动和换热。定量测定了沿肋片高度方向局部换热系数的变化规律,建立了无因次准则关系式,揭示了肋宽及通道放置位置对换热的强烈影响。在倾斜放置时,通道上、下两个肋片的换热能力相差很大,下肋的换热能力可达上肋的1.33—2.33倍。在小于30°范围内,倾斜放置的平均换热性能略优于水平放置;在30°—90°范围内,倾斜放置的换热性能显著低于水平放置;当90°时,其换热性能仅为水平放置时的35％。
In this paper, the Mach-Zehnder interference technique was used to study the flow and heat transfer of non-isothermal rectangular fin channels under natural convection cooling conditions. The variation rule of local heat transfer coefficient along the height direction of fins was quantitatively determined. The relational formula of dimensionless criterion was established, and the strong influence of rib width and channel placement on heat transfer was revealed. When placed obliquely, the heat exchange capacity of the two upper and lower fins of the channel varies greatly, and the heat exchange capacity of the lower rib can reach 1.33-2.33 times of the upper rib. In the range of less than 30 °, the average heat transfer performance of the inclined placement is slightly better than that of the horizontal placement; in the range of 30 ° -90 °, the heat transfer performance of the inclined placement is significantly lower than that of the horizontal placement; when the temperature is 90 °, the heat exchange performance Only 35% when placed horizontally.