PEMODELAN DAN VERIFIKASI ALIRAN DUA FASE (AIR-UDARA) DI BELOKAN 90°
ABSTRACT: Two phase flow in a
piping installation is influenced by the interaction between phases, geometry
and orientation (vertical or horizontal), flow direction (up or down) that may
affect the flow pattern. In contrast to single phase flow which only influenced
by the Reynolds number in the formula of density, viscosity and pipe diameter.
So the two phase flow has an interesting phenomenon to be studied which is the
result of the pressure drop to form a flow pattern. The purpose of this study
are to determine the pressure drop that occurs in the 90° from the horizontal
position to a vertical position, and to analyze the flow pattern of two-phase
fluid (water-air) at 90° in computational simulation and visualization verified
with the help of high-speed digital camera. This study used clear PVC pipe
(CPVC) and acrylic (PMMA) material in the 90° curves--test section with the aim
to observe the flow pattern visualization then analyzed through simulation
modeling with ANSYS software and verified experimentally. The calculation of
the pressure drop in the 90° curve calculated theoretically and experimentally
so that research can be studied scientifically. There was relationship between
the flow patterns of the amount of pressure drop in the two-phase flow curves
90° of the thickness of the interface. The bigger the thickness of the
interface, the pressure drop decreases both theoretically and experimentally
due to the friction between the interfaces associated with friction factor, in
this case is influenced by the Reynolds number and its value is inversed so the
greater proportion of the air volumetric (β) then the Reynolds water number (Re
SL) will decrease and increases friction between phase, besides the back
pressure in the curve also affect the thickness 90° interface.There is wavy
flow or turbulence in the bottom of horizontal pipe when the flow is laminar,
it because of gravitation and centrifugal force or twin eddy in the actual
speed ratio ( 𝑣 𝐺 𝑣 𝐿)
. The conditions influenced the flow pattern and pressure drop. The highest
value of speed ratio ( 𝑣 𝐺 /𝑣
𝐿
) is 1,824 at vSG 0,076 m/s and the lowest is 0,423 at v SG 0,025 m/s.
Penulis: Arif Yunizar Nugraha,
Rudy Soenoko, Slamet Wahyudi
Kode Jurnal: jptmesindd140200
