Karakteristik Perpindahan Panas Dan Penurunan Tekanan Sirip-sirip Pin Silinder Tirus Susunan Segaris Dan Selang-seling Dalam Saluran Segi Empat

Abstract

This research was conducted to investigate the characteristics of heat transfer and pressure drop of tapered cylindrical pin fins array in the rectangular channel. The pin fins were arranged either inline or staggered. The average temperature of base plate surface was kept constant at 60oC. Pin fins were made of duralumin having the dimension of 75 mm of height, base and tip diameter 12.7 and 7 mm respectively, and the distance inter-fin pitch in the spanwise direction, Sx/D, was kept constant at 2.95. The parameters of this research were Reynolds number 3,100 – 39,200 for the inline array and 3,095 – 37,741 for the staggered array based on averaged inlet air velocity and hydraulic diameter, and the distance between the inter-fin pitch in the streamwise direction, Sy/D, was varied at 1.97, 2.36, 2.95, and 3.94. The research result shows that for both fin arrangements increasing Reynolds number and decreasing the distance Sy/D increases Nusselt number, that means increases heat transfer rate where it reaches maximum at Sy/D = 2.36. The values of pressure drop (P) and friction factor (f) decreases with increasing Sy/D