High heat transfer rate is essential in several industrial applications, including, nuclear reactors, storage and transport of cryogenic liquid, and metal forming, which deal with the rapid cooling of various materials. Rapid cooling of surfaces at temperatures significantly higher than the boiling point of the coolant is often restricted by formation of a vapor layer around the surface that retards the rate at which heat can be dissipated. In the present work we report on the effect of finned structures of millimetric length scale on the enhancement of heat transfer performance during quenching. The fins are observed to destabilize hydrodynamic vapor layer during film boiling. We show that the quench duration reduces by ~3.8 times and the maximum heat flux (MHF) increases by nearly 230% for the finned sample as compared to the smooth samples. The quench duration and heat transfer rate are shown to be dependent on spacing between fins and the optimum fin spacing is determined to yield the highest MHF and minimum quench time.

高传热率在多种工业应用中至关重要，包括核反应堆、低温液体的储存和运输以及处理各种材料快速冷却的金属成型。在显着高于冷却剂沸点的温度下对表面进行快速冷却通常会受到在表面周围形成蒸汽层的限制，蒸汽层阻碍了热量的消散速度。在目前的工作中，我们报告了毫米长度尺度的翅片结构对淬火过程中传热性能增强的影响。观察到翅片在薄膜沸腾期间使流体动力蒸汽层不稳定。我们表明，与光滑样品相比，翅片样品的淬火持续时间减少了约 3.8 倍，最大热通量 (MHF) 增加了近 230%。