Parametric study of a model for determining the liquid flow-rates from the pressure drop and water hold-up in oil–water flows

2007 ◽  
Vol 33 (12) ◽  
pp. 1365-1394 ◽  
Author(s):  
M. Hadžiabdić ◽  
R.V.A. Oliemans
Keyword(s):  
Pressure Drop ◽  
Liquid Flow ◽  
Parametric Study ◽  
Flow Rates ◽  
Water Flows ◽  
Oil Water

The effect of two-phase flow regime on hydrodynamics and mass transfer in a horizontal-tube gas-liquid reactor

1985 ◽  
Vol 50 (3) ◽  
pp. 745-757 ◽  
Author(s):  
Andreas Zahn ◽  
Lothar Ebner ◽  
Kurt Winkler ◽  
Jan Kratochvíl ◽  
Jindřich Zahradník
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Flow Regime ◽  
Liquid Flow ◽  
Horizontal Tube ◽  
Liquid Holdup ◽  
Two Phase ◽  
Flow Rates ◽  
Type Relation ◽  
Good Agreement

The effect of two-phase flow regime on decisive hydrodynamic and mass transfer characteristics of horizontal-tube gas-liquid reactors (pressure drop, liquid holdup, kLaL) was determined in a cocurrent-flow experimental unit of the length 4.15 m and diameter 0.05 m with air-water system. An adjustable-height weir was installed in the separation chamber at the reactor outlet to simulate the effect of internal baffles on reactor hydrodynamics. Flow regime maps were developed in the whole range of experimental gas and liquid flow rates both for the weirless arrangement and for the weir height 0.05 m, the former being in good agreement with flow-pattern boundaries presented by Mandhane. In the whole range of experi-mental conditions pressure drop data could be well correlated as a function of gas and liquid flow rates by an empirical exponential-type relation with specific sets of coefficients obtained for individual flow regimes from experimental data. Good agreement was observed between values of pressure drop obtained for weirless arrangement and data calculated from the Lockhart-Martinelli correlation while the contribution of weir to the overall pressure drop was well described by a relation proposed for the pressure loss in closed-end tubes. In the region of negligible weir influence values of liquid holdup were again succesfully correlated by the Lockhart-Martinelli relation while the dependence of liquid holdup data on gas and liquid flow rates obtained under conditions of significant weir effect (i.e. at low flow rates of both phases) could be well described by an empirical exponential-type relation. Results of preliminary kLaL measurements confirmed the decisive effect of the rate of energy dissipation on the intensity of interfacial mass transfer in gas-liquid dispersions.

scholarly journals Drag Reduction with Biopolymer-Synthetic Polymer Mixtures in Oil-Water Flows: Effect of Synergy

2020 ◽  
Vol 24 (6) ◽  
pp. 1-10
Author(s):  
Lawrence Chukwuka Edomwonyi-Otu ◽  
Muhammed Muhammed Gimba ◽  
Nurudeen Yusuf
Keyword(s):  
Reynolds Number ◽  
Pressure Drop ◽  
Pressure Gradient ◽  
Drag Reduction ◽  
Water Flow ◽  
Transport Systems ◽  
Test Fluid ◽  
Polymer Mixture ◽  
Water Flows ◽  
Oil Water

The search for lower cost materials that reduce pressure drop in fluid transport systems in oil and gas industries to conserve pumping energy is of paramount importance. Polymers are known to reduce pressure drop in pipeline oil-water flows in a process referred to as drag reduction (DR). The effect of partially hydrolysed polyacrylamide, polyethylene oxide, Aloe Vera mucilage and their mixtures as drag reducing polymers (DRPs) on pressure gradient (pressure drop; Δp) in pipeline oil-water flows were studied. The experiment was carried out in flow rig with 0.02-m diameter straight unplasticised polyvinylchloride (uPVC) pipe, two centrifugal pumps, control valves and two storage tanks. Tap water (ρ = 997 kg/m3 and µ = 0.89 cP) and diesel (ρ = 832 kg/m3 and µ = 1.66 cP) were used as the test fluid at ambient condition. The polymer mixture total concentration (MTC) of 30 and 400 ppm at different mixing proportion, mixture Reynolds number (Remix) and oil input volume were investigated. The results show increase in pressure gradient with increase in oil input volume in both single-phase water flow and oil-water flow before adding drag reducing polymers (DRPs). However, Δp decreased after adding DRPs with increase in Reynolds number (Re) or Remix and decrease in the oil-phase Re, and vice versa. The results further showed higher reduction in pressure drop by the polymer mixture than in each of the polymer used at the same conditions. The rigidness of the biopolymer was improved by adding synthetic polymers which resulted to increase in DR efficiency.

scholarly journals Flow pattern and pressure drop for oil–water flows in and around 180° bends

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Paul Onubi Ayegba ◽  
Lawrence C. Edomwonyi-Otu ◽  
Abdulkareem Abubakar ◽  
Nurudeen Yusuf
Keyword(s):  
Pressure Drop ◽  
Pressure Gradient ◽  
Flow Pattern ◽  
Phase Inversion ◽  
Superficial Velocity ◽  
Pressure Losses ◽  
Water Flows ◽  
Oil Water ◽  
Velocity Pressure ◽  
Mixture Velocity

AbstractPressure drop and flow pattern of oil–water flows were investigated in a 19-mm ID clear polyvinyl chloride pipe consisting of U-bend with radius of curvature of 100 mm. The range for oil and water superficial velocities tested was $$0.04 \le U_{{{\text{so}}}} \le 0.950 \;{\text{m/s}}$$ 0.04 ≤ U so ≤ 0.950 m/s and $$0.13 \le U_{{{\text{sw}}}} \le 1.10 \;{\text{m/s}}$$ 0.13 ≤ U sw ≤ 1.10 m/s , respectively. Measurements were carried out under different flow conditions in a test section that consisted of four different parts: upstream of the bend, at the bend and at two redeveloping flow locations after the bend. The result indicated that the bend had limited influence on downstream flow patterns. However, the shear forces imposed by the bend caused some shift flow pattern transition and bubble characteristics in the redeveloping flow section after the bend relative to develop flow before the bend. Generally, pressure gradient at all the test sections increased with both oil fraction and water superficial velocity and there was a sharp change of pressure gradient profile during phase inversion. The transition point where phase inversion occurred was always within the range of $$0.4 \le U_{{{\text{sw}}}} \le 0.54 \;{\text{m/s}}$$ 0.4 ≤ U sw ≤ 0.54 m/s . Pressure losses differed at the various test sections, and the difference was strongly linked to the superficial velocity of the phases and the flow pattern. At high mixture velocity, pressure losses at the redeveloping section after the bend were higher than that at the bend and that for fully developed flows. At low mixture velocity, pressure losses at the bend are higher than in the straight sections. Pressure drop generally decreased with level of flow development downstream of the bend.

Film thickness planar sensor in oil-water flow: prospective study

Sensor Review ◽  
2015 ◽  
Vol 35 (2) ◽  
pp. 200-209 ◽  
Author(s):  
Adriana Bonilla Riaño ◽  
Antonio Carlos Bannwart ◽  
Oscar M.H. Rodriguez
Keyword(s):  
Film Thickness ◽  
Water Flow ◽  
Liquid Flow ◽  
Measurement Techniques ◽  
Thickness Measurement ◽  
Content Type ◽  
Water Flows ◽  
Oil Water ◽  
Gas Liquid Flow ◽  
Film Thickness Measurement

Purpose – The purpose of this paper is to study a multiphase-flow instrumentation for film thickness measurement, especially impedance-based, not only for gas–liquid flow but also for mixtures of immiscible and more viscous substances such as oil and water. Conductance and capacitive planar sensors were compared to select the most suitable option for oil – water dispersed flow. Design/methodology/approach – A study of techniques for measurement of film thickness in oil – water pipe flow is presented. In the first part, some measurement techniques used for the investigation of multiphase flows are described, with their advantages and disadvantages. Next, examinations of conductive and capacitive techniques with planar sensors are presented. Findings – Film thickness measurement techniques for oil–water flow are scanty in the literature. Some techniques have been used in studies of annular flow (gas–liquid and liquid–liquid flows), but applications in other flow patterns were not encountered. The methods based on conductive or capacitive measurements and planar sensor are promising solutions for measuring time-averaged film thicknesses in oil–water flows. A capacitive system may be more appropriate for oil–water flows. Originality/value – This paper provides a review of film thickness measurements in pipes. There are many reviews on gas – liquid flow measurement but not many about liquid – liquid flow.

scholarly journals Flow Pattern and Pressure Drop for Oil-Water Flows in and around 180° Bends

2020 ◽  
Author(s):  
Paul Onubi Ayegba ◽  
Lawrence C. Edomwonyi-Otu ◽  
Abdulkareem Abubakar ◽  
Nurudeen Yusuf
Keyword(s):  
Pressure Drop ◽  
Pressure Gradient ◽  
Flow Pattern ◽  
Phase Inversion ◽  
Superficial Velocity ◽  
Pressure Losses ◽  
Water Flows ◽  
Oil Water ◽  
Velocity Pressure ◽  
Mixture Velocity

Pressure drop and flow pattern of oil-water flows were investigated in a 19 mm ID clear polyvinyl chloride pipe consisting of U-bend with radius of curvature of 100 mm. The range for oil and water superficial velocities tested were and respectively. Measurements were carried out under different flow conditions in a test section that consisted of four different parts: upstream of the bend, at the bend and at two redeveloping flow locations after the bend. The result indicated that the bend had limited influence on downstream flow patterns. However, the shear forces imposed by the bend caused some shift flow pattern transition and bubble characteristics in the redeveloping flow section after the bend relative to develop flow before the bend. Generally, pressure gradient at all the test sections increased with both oil fraction and water superficial velocity and there was a sharp change of pressure gradient profile during phase inversion. The transition point where phase inversion occurred was always within the range of . Pressure losses differed at the various test sections and the difference was strongly linked to the superficial velocity of the phases and the flow pattern. At high mixture velocity, pressure losses at the redeveloping section after the bend were higher than that at the bend and that for fully developed flows. At low mixture velocity, pressure losses at the bend are higher than in the straight sections. Pressure drop generally decreased with level of flow development downstream of the bend.

Simulation of a Major Oilfield Gas-Gathering Pipeline System

1985 ◽  
Vol 107 (3) ◽  
pp. 397-401
Author(s):  
J. P. Brill ◽  
T. R. Sifferman ◽  
B. Samaroo ◽  
S. Arirachakaran
Keyword(s):  
Saudi Arabia ◽  
Pressure Drop ◽  
Phase Behavior ◽  
Liquid Flow ◽  
Dew Point ◽  
Pipeline System ◽  
Temperature Profiles ◽  
Gas Velocity ◽  
Flow Rates ◽  
Retrograde Condensation

An engineering design study was performed on a gas-gathering system in a major offshore oilfield in Saudi Arabia. The dew point gas from separators will undergo retrograde condensation in the pipelines with reduction of pressure and temperature. Calculations presented for sizing the pipelines include phase behavior, pressure drop, temperature profiles, liquid volumes, flow pattern predictions, liquid flow rates and the minimum gas velocity required to continuously remove liquid from the risers.

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