EXPERIMENTAL INVESTIGATION OF CONVECTION HEAT TRANSFER IN MINI-FIN STRUCTURES

摘要

Forced convection heat transfer of air and water in bronze and pure copper mini-fin structures and a sintered bronze porous media was investigated experimentally. The mini-fin dimensions were 0.7mmx0.2mm, 0.8mmx0.2mm, 0.8mmx0.4mm and 0.8mmx0.8mm. The tests investigated the effects of fluid velocity, mini-fin dimensions and materials, and fluid properties on the convection heat transfer and heat transfer enhancement. The results showed that the mini-fin structures greatly increased the heat transfer coefficient. 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 flow resistance for water and air flowing through the mini-fin structure was less, while the heat transfer coefficient was higher than in the sintered bronze porous structure.