多孔表面新型复杂结构优化沸腾传热的实验研究

Pool boiling heat transfer experiment on an optimizing porous surfaces with vapor channels

报道了 R1 1在烧结多孔表面开槽时沸腾传热的实验研究。实验发现 ,与普通槽道和双空隙层多孔表面相比 ,沸腾换热增强 ,沸腾表现为液体灌注、槽道起泡、底部蒸干三个区。对特定的多孔层 ,开槽可获得更好的换热效果。带槽道的多孔表面实验件与均匀多孔表面相比 ,在相同壁面过热度 ( θ)条件下 ,热流密度 ( q)提高2～ 1 0倍 ,临界热流密度提高 2～ 4倍。

Boiling heat transfer on a new structural porous coated surfaces with vaper channels was investigated experimentally. In this experiment, R11 is employed to determine the effects on the boiling heat transfer. Observations showed that bubbles escaping from the channels enhanced the heat transfer. Three regimes were identified: liquid flooding, bubbles in the channel and dry-out. The heat transfers coefficient and q· CHF of the porous surfaces with vapor channels was much higher than that on the smooth surface. The critical heat flux increased 2~4 times and the boiling heat transfer coefficient was improved 2~10 times.