PENGUJIAN KARAKTERISTIK ALIRAN FASA TUNGGAL ALIRAN AIR HORISONTAL PADA ANNULUS SEMPIT DARI PENUKAR KALOR PIPA KONSENTRIK
Abstract: This research
was conducted to
investigate flow characteristics with/without heat exchange
of single phase
horizontal water flow in
narrow annulus of a concentric tube
heat exchanger. Test
section was a
concentric tube heat exchanger. The
inner tube was
made of aluminium
with inside and
outside diameters of 17.34 mm and 19.07 mm. The outer tube was made of
aluminium with inside and
outside diameters of
23.84 mm and
25.14 mm. The
pressure measuring length was 1,198 mm. Hydraulic diameter of narrow annulus was 4.77 mm. Flows in the
inner tube and in annulus were in opposite directions. Working fluid
used in this
research was water.
For the flow
with heat exchange, the water
temperature at the inlet of inner tube was maintained at 60oC. In
this research, the water mass flow rate and pressure drop across narrow annulus
were measured at steady states. Results of the research were compared with
predictions from conventional flow theory. Results of the research shown that the
flow characteristics of
water through the
narrow annulus were different from those in normal pipes.
The transition from laminar to turbulent flow was initiated earlier than that
in normal pipes, i.e. at a Reynolds number range from 1,400 to 1,800. The flow
friction factorof the horizontal flow with heat
exchange was larger
than that without
heat exchange at the Reynolds number lower
than 800. The
flow friction characteristics in
narrow annulus had relations
to liquid temperature
difference at the
inlet and outlet
of the annulus. It was
concentrated in the laminar flow area.
Penulis: Wibawa Endra J, Tri
Istanto, Yusno Yulianto
Kode Jurnal: jptmesindd110016
