PENGUJIAN KARAKTERISTIK PERPINDAHAN PANAS DAN PENURUNAN TEKANAN SIRIP-SIRIP PIN ELLIPS SUSUNAN SELANG-SELING DALAM SALURAN SEGIEMPAT
Abstract: This research was
conducted to investigate the characteristics of heat transfer and pressure drop
as well as the thermal performance ofelliptical pin fin array in the rectangular
channel which air was passed through itas coolant fluid. The pin fins were arranged
in staggered manner.
Dimension of base
plate in which
pin fins were attached was 150 mm
x 200 mm x 6.5 mm. 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, the major and minor axis length of the elliptical
pin fin
15 mm and
6 mm respectively,
and the distance
inter-fin picth in the
spanwise direction was
kept constant at
Sx/Dπ,= 3.57. The
parameters of this research were Reynolds number (Re) 3,152
– 37,879 based on averaged inlet air velocity and hydraulic diameter of
rectangular channel, and the distance between the inter-fin pitch in the
streamwise direction (Sy/Dπ=2.38 – 4.76) The research result shown that
increasing Reynolds number and
decreasing the distance Sy/Dπ increased
Nusselt number (Nu),
that means increased
heat transfer rate where
it reach maximum
at Sy/Dπ =2.38.
The values of
pressure drop (∆P) and
friction factor (f)
decreased with increasing
Sy/Dπ. Thermal performance decreased
with increasing Reynolds
number. The thermal performances (η) varied between 0.84
– 1.52. For Sy/Dπ= 3.57 at Re > 37,965 and Sy/Dπ= 4.76 at Re > 25,240,
the thermal performance value is less than 1 and varied between 0.76 - 0.97. At
Sy/Dπ= 2.38 produced the highest of thermal performances for the whole of Re. A
net energy gaincan be achieved up to 52% for the value of Sy/Dπ= 2.38 and Re
=3,132.
Penulis: Tri Istanto, Wibawa
Endra J, Akhyar Wahyu Rokhadi
Kode Jurnal: jptmesindd110015
