Pengujian Karakteristik Perpindahan Panas dan Faktor Gesekan dari Sirip-Sirip Pin Silinder Susunan Segaris Dalam Saluran Segiempat
Abstrak: Surface heat transfer
extension using fins often used in heat exchanger equipment to enhance heat
transfer. This research was conducted to investigate the characteristics of
heat transfer and pressure drop as well as thermal performance of inline
cylindrical pin fin assembly in rectangular channel. It was used cylindrical
pin fins with 12.7 mm of diameter and 75 mm of height. The parameters of this research
were Reynolds number (3,000 – 37,500), depending on the averaged inlet air
velocity and hydraulic diameter, the interfin pitch distance in the spanwise
direction (Sx/D) which was kept constant at 2.95 and the interfin pitch
distance in the streamwise direction (Sy/D = 1.97 – 3.94). The experimental
result shown that increasing Reynolds number (Re) and decreasing the interfin
pitch distance in the streamwise direction (Sy/D) increased the average
convection heat transfer coefficient (h) and Nusselt number (Nu). The pressure
drop (P) and friction factor (f) decreased while the
interfin pitch distance in the streamwise direction (Sy/D) increased.
Increasing Reynolds number would decrease thermal performance (). At Sy/D =
1.97 for Re > 24,900, and Sy/D > 1.97 for Re > 12,400, the
values of were less than 1, i.e. the used of pin fin
assembly would cause an energy loss rather than gain. The net energy gain (
was greater than 1) was only at Sy/D = 1.97 for Re < 24,900, and at Sy/D
> 1.97 for Re < 12,400. A net energy gain up to 28 % was achieved
at Sy/D = 1.97 for Re = 3,076.
Penulis: Tri Istanto, Wibawa
Endra J, Mahmudin Huda
Kode Jurnal: jptmesindd090020
