Experimental Investigation in Cross-Flow Heat Transfer of Air Over LFFTBHE

Abstract

The heat transfer and fluid flow of airflow in a staggered flat tube bank in crossflow with laminar forced convection are experimentally investigated and presented in this study. Two rows of finned tubes were placed perpendicular to the flow direction. The air velocity varies between 0.29 m/s–1.46 m/s, and the Reynolds number approximately ranged from . The surface temperature in all tubes is constant. The dimensionless upstream fin length ( =0.4, 0.6, 0.8, and 1), respectively, and the dimensionless downstream fin length( the dimensionless transverse pitch ( ) of 3.0, the dimensionless longitudinal pitch ( ) =4.0, and the dimensionless fin angle ( =0.52 with constant physical properties. The results show that the Nusselt number, friction factor, and Colburn factor are inversely proportional to the upstream fin length. The percentage of deficient was 14%, 12%, and 35%, respectively, in contrast to the Bejan number, where the percentage of improvement was 11%. Correspond to the highest value of the Reynolds number. This is fully consistent with the principles of Constructal Law.