Experimental investigation of heat transfer enhancement by using perforated fin array having different perforation ratios, angle of inclination and configuration of fins under forced convection condition

Abstract

In this research work experimental investigation and comparative study of heat transfer enhancement between solid fins and circular perforated fin array is performed. Current investigation is mainly associated with inline and zigzag configuration of perforations, angle of inclination (0○-90○) and size of perforation (4-12 mm) under forced convection condition. Enhancement of performance is reported at 10 mm diameter size perforation (perforation ratio, β = 21%) and 45○ angle of inclination. Among the fin arrays used in this study two rows of zigzag perforation (ZC) is found to be superior than two rows of inline perforations (IC) configurations. The highest ratio of Nusselt number of perforated fins to that of solid fins up to 1.73 fold is reported. As against solid fin array 57.27% heat transfer enhancement with 21% saving in fin material is reported. Based on optimized experimental results mathematical correlation is suggested for the range of parameters viz. Reynolds number (14,783 ≤ Re ≤ 73,916), angle of inclination (θ = 45○), perforation ratio (0 ≤ β ≤ 0.21) and heat input (Q = 60 W).