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Sains Malaysiana 45(11)(2016): 1635–1640 Experimental Determination of Flow Patterns
and Water Holdup of Low Viscosity Oil-Water System in Horizontal
Pipes (Penentuan Secara Uji Kaji
Corak Aliran
dan Air Tertahan bagi Sistem Minyak
Berkelikatan Rendah-Air
di dalam Paip Mendatar) M.D.U.
ONUOHA1,
I.
ISMAIL2*,
A.S.
ISMAIL2
& M.F. MANSOR2 1Offshore Oil and Gas Research Center,
College of Mechanical and Oil & Gas Transportation Engineering,
China University of Petroleum Beijing, #18 Fuxue
Road Changping, Beijing, 102249, P. R. China 2UTM-MPRC Institute for Oil and Gas,
Universiti Teknologi
Malaysia, 81310 Johor Bahru, Johor Darul
Takzim, Malaysia Diserahkan: 3 Mac 2014/Diterima:
21 Mac 2016 ABSTRACT Fluids with different properties
would exhibit different flow behaviour
in any multiphase flow system at a given operating condition.
Therefore, an in-depth knowledge of the operational and flow behaviour
of any known fluid properties in a multiphase flow system of either
liquid-liquid two-phase flow (oil and water) or gas-liquid-liquid
three-phase flow (gas, oil and water) would be helpful in designing
of pipelines and optimization of the production, separation, transportation
and distribution systems, as may be found in oil and gas and allied
petro-chemical industries. This paper presents the experimental
observation of the flow patterns and water holdup for a two-phase
low viscosity oil-water flow in horizontal pipes. The test fluids
comprised of tap water and 2D-diesel which has a density of 832
kg/m3, viscosity of 3.24 mPa.s, surface
tension of 0.030 N/m and flash point of 79°C. A total of 30 runs
has been accomplished and the experimental results showed three
different flow patterns identified as stratified flow (ST), stratified flow with mixing
interface (ST&MI) and water-in-oil dispersed
flow (), with superficial velocities of oil and water in the ranges
of 0.32 - 0.87 m/s (Vos) and 0.20 - 0.90 m/s
(Vws), respectively. However, analysis
of water holdup in the commingled flows of the test fluids showed
its dependency on the fluid flow patterns and superficial velocity
of water. Keywords: Dispersed flow; flow
pattern; low viscosity oil; two phase flow; water holdup ABSTRAK Bendalir dengan sifat
yang berlainan memberikan
tingkah laku aliran
yang berbeza dalam
sebarang sistem aliran pelbagai fasa bagi suatu
keadaan operasi
yang diberi. Oleh
yang demikian, pengetahuan
yang mendalam tentang
operasi dan tingkah
laku aliran
bagi sebarang sifat
bendalir yang diketahui
dalam suatu sistem
aliran pelbagai
fasa, sama ada
aliran dua
fasa cecair-cecair (minyak dan air) atau aliran tiga
fasa gas-cecair-cecair (gas, minyak dan air), adalah berguna ketika mereka bentuk talian
paip dan pengoptimuman sistem pengeluaran, pemisahan, pengangkutan dan penghantaran dalam industri minyak dan gas serta industri
kimia. Kertas ini mengetengahkan
pemerhatian secara
uji kaji terhadap
corak aliran
dan air tertahan bagi aliran dua
fasa minyak
berkelikatan rendah-air di dalam paip mendatar.
Bendalir
kajian terdiri daripada air paip dan diesel-2D dengan ketumpatan 832 kg/m3, kelikatan
3.24 mPa.s, tegangan
permukaan 0.030 N/m dan takat kilat 79°C. Sebanyak 30 uji kaji telah
dijalankan dengan
hasilnya menunjukkan tiga jenis corak
aliran telah
dikenal pasti. Corak aliran terbabit
ialah aliran
berstrata (ST), aliran
berstrata dengan
percampuran antara muka (ST&MI) dan
aliran terserak
air dalam minyak (Dw/o),
dengan halaju
pada permukaan minyak dan air masing-masing dalam julat 0.32 - 0.87 m/s (Vos)
dan 0.20 - 0.90 m/s (Vws).
Walau
bagaimanapun, analisis yang dilakukan terhadap air tertahan dalam aliran tercampur bendalir kajian mendedahkan kebergantungannya kepada corak aliran
bendalir dan
halaju aliran air. Kata kunci: Air terserak;
aliran tertahan;
aliran dua fasa;
corak aliran;
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1-10. *Pengarang untuk surat-menyurat; email: issham@petroleum.utm.my
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