CHARACTERISTICS OF CONVECTIVE HEAT TRANSFER COEFFICIENT ON BUILDING ARRAY MODEL BY WIND TUNNEL EXPERIMENT

摘要

Aiming to know characteristics of heat transfer coefficient from urban surface to upper atmosphere, experiments were carried out by using a building array model set in a boundary layer wind tunnel. The results show that both of forced and natural convections influence heat transfer coefficient.Effect of forced convention upon heat transfer coefficient is remarkable more thna that of natural convection. Composite expressions of Reynolds number Re and Grashof number Gr for Nusselt number Nu have been obtained for each surface; building and ground. These results are applied for the angle of Re 3.0x10~3 to 2.6x10~4 to 4.7x10~5.