微细板翅与烧结多孔结构中对流换热实验研究

本文对水和空气流过4个微细板翅结构和1个烧结多孔结构中的对流换热进行了实验研究,并对其流动与对流换热性能进行了分析和比较。结果表明:在本文实验参数范围内,与空槽道相比,这4种微细板翅结构分别使水的对流换热系数增加10—24倍,分别使空气的对流换热增强了16~40倍;与相同孔隙率的烧结多孔结构相比,微细板翅结构中的流动阻力相近,而对流换热系数却增大。存在最优的微细板翅结构,其换热性能大大强于烧结多孔结构,而流动阻力更小。

EXPERIMENTAL INVESTIGATION OF CONVECTION HEAT TRANSFER IN MINI-FIN STRUCTURES AND SINTERED POROUS MEDIA

Forced convection heat transfer of air and water in four kinds of mini-fin structures and a sintered bronze porous media were investigated experimentally. The results showed that for the tested conditions the convection heat transfer coefficient was increased 10~24 fold for water and 16~40 fold for air in the mini-fin structures compared with an empty plate channel. The heat transfer coefficients in the mini-fin structure were larger than in the sintered porous plate channel with the same porosity and material and similar dimensions. An optimum mini-fin structure should exist, which has much larger heat transfer coefficient and less pressure drop than sintered porous media.