A computer based hot-film technique used for flow measurements in a vertical kerosene-water pipe flow

Farrar, B; Bruun, Hans Henrik

doi:10.1016/0301-9322(96)00012-2

Cited by 43 publications

(29 citation statements)

References 18 publications

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“…In this pattern, due to lift forces the water phase is prone to be dragged into the core of the flow as the complex multiphase dispersions and elongated drops. Here, the velocity of dispersed phase usually has a centre-peaked profile, [30] which is similar to that reported for the single-phase profile. [31] Thus, the water phase travels faster in the pipe.…”

Section: Horizontal Flowsupporting

confidence: 82%

Characteristics of water holdup for oil and water mixture flows in horizontal, vertical, and inclined pipes

Liu

Zhang

et al. 2016

Can J Chem Eng

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In this work, the water holdup and slippage for oil and water mixture flows in horizontal, vertical, and inclined pipes have been investigated. A large group of experimental data was collected from 21 different sources covering the whole range of inclination angles from À908 to 908 to reveal the holdup characteristics and develop the drift velocity model. The results show that in horizontal flows the water holdup is dependent to the flow pattern, and yet in vertical flows the water holdup is similar to the input one and the flow direction shows a few influences on the holdup. In inclined flows, the Froude numbers are relatively independent of inclination angles when the angles are greater than 308. Therefore, the changes of water holdup in the pipe with small inclination angles are more severe than those with large inclination angles. In addition, a satisfactory agreement between predicted and experimental holdups substantiates the general validity of the proposed drift velocity correlation for oil and water flows, especially for those with large inclination angles.

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Section: Horizontal Flowsupporting

confidence: 82%

Characteristics of water holdup for oil and water mixture flows in horizontal, vertical, and inclined pipes

Liu

Zhang

et al. 2016

Can J Chem Eng

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“…Therefore, to understand the effect of different interphase forces, a series of simulations have been carried out. For this purpose, the experimental data reported by Farrar and Bruun 21) have been considered.…”

Section: Resultsmentioning

confidence: 99%

“…Farrar and Bruun 21) carried out experiments in a 1.5 m long pipe of 78 mm internal diameter with kerosenewater system. Hot film anemometry (HFA) was used for measuring the profile of holdup and velocity.…”

Section: Methodsmentioning

confidence: 99%

“…An alternative approach (Reynolds Stress Model or RSM) was also tested. Figures 10 and 11 show the comparison for radial profile of dispersed phase across the pipe for two different turbulence models at the experimental conditions of Farrar and Bruun 21) and Al-Deen and Bruun 22) . The RSM did not show better predictive performance than k-ε in predicting the average dispersed phase holdup.…”

Section: Effect Of Turbulence Modelmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation of Oil Dispersions in Vertical Pipe Flow

Parvini¹,

Dabir²,

Mohtashami³

2010

J. Jpn. Petrol. Inst.

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Immiscible liquid dispersions are widely used in chemical process, petroleum industries, polymerization, heterogeneous chemical synthesis, etc. In most of these chemical processes, the rate of inter-phase heat and mass transfer is known to strongly affect the overall performance and depends on the interfacial contact area between the phases. This study at CFD simulations of immiscible liquid dispersion has been performed on a vertical pipe. With specific reference to dispersed liquid-liquid flows, it was seen that the two-fluid approach (Eulerian-Eulerian approach) was extensively used for multiphase modeling, especially when detailed predictions are desirable over a range of holdups in exchange for a reasonable amount of computation power. The results of CFD predictions for water as a continuous and kerosene as a dispersed phase have been compared with the experiments of Farrar and Bruun and Al-Deen and Bruun. These simulations have also been done to understand the effect of various significant forces in turbulent liquid dispersions (drag, lift, turbulent dispersion and added mass). Several expressions for these forces were tested in order to choose the best combination. Further, the problem has been simulated using two different turbulence models. It has been found that lift force is more important than turbulent dispersion and added mass. Inter-phase closure guidelines for liquid-liquid bubbly flows were developed based on simulation results that yielded the best agreement with experimental data.

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“…The measurement of velocity and volume fraction profiles of the dispersed phase has received much less attention in the literature for oil-water flows than in is the case for gas-liquid flows. However the principal previous work in this field includes that which has been carried out by; (i) Vigneaux et al [5] who measured local oil volume fraction distributions, in vertical and inclined oil water flows in a 200mm diameter pipe, using a high frequency impedance probe; (ii) Bruun's group [6] and [7] who investigated optical and hot-wire probes as a means of measuring the local properties of vertical oil-water flows; (iii) Zhao et al [8] who measured local oil volume fraction profiles, interfacial velocity profiles, interfacial area concentration profiles and oil drop diameters in a vertical 40mm diameter tube using a double-sensor conductivity probe; and (iv) Lum et al [9] who used high speed video filming and impedance probes to measure phase distributions in oil-water flows inclined at small angles (less than o 10 ) to the horizontal in a 38mm diameter pipe. More recently, Wang et al [10] have attempted to use dual-plane ERT to measure local oil volume fraction and velocity profiles in vertical oil-in-water flows in an 80mm diameter pipe.…”

Section: Introductionmentioning

confidence: 99%

Oil volume fraction and velocity profiles in vertical, bubbly oil-in-water flows

Lucas

Panagiotopoulos

2009

Flow Measurement and Instrumentation

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A computer based hot-film technique used for flow measurements in a vertical kerosene-water pipe flow

Cited by 43 publications

References 18 publications

Characteristics of water holdup for oil and water mixture flows in horizontal, vertical, and inclined pipes

Characteristics of water holdup for oil and water mixture flows in horizontal, vertical, and inclined pipes

Numerical Simulation of Oil Dispersions in Vertical Pipe Flow

Oil volume fraction and velocity profiles in vertical, bubbly oil-in-water flows

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