An experimental study of two-phase flow in slightly inclined pipes—I. Flow patterns

Kokal, Sunil; Stanislav, J.F.

doi:10.1016/0009-2509(89)85042-0

Cited by 78 publications

(48 citation statements)

References 22 publications

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“…The pressure loss fell with increasing gas rate until at vsG o 10ms-' the pressure drop became negative at the onset of the blow-through-slug regime. Kokal and Stanislav [42] also reported low pressure gradients over a range of flows due to the formation of stratification, phase discontinues and other complex phenomena. As the gas rate was increased beyond vsG = IOrns-' the pressure drop increased dramatically eventually forming a straight line region very similar to but initially below that obtained with horizontal flow where the pressure loss was largely unaffected by the angle of inclination.…”

Section: Pressure Dropmentioning

confidence: 90%

“…The overall result was not satisfactory and other work showed it did not improve with change in diameter or angle of inclination. The Kokal and Stanislav [42] transition predicted the slug to blow through slug regime with precision for diameters from 0.026 to 0.095111 i.d. …”

Section: Flow Regime Mapsmentioning

confidence: 99%

“…The relatively smooth pressure loss fluctuations normally associated with horizontal stratified flow did not exist in downhill flow, where there were more fluctuations over a wider range. This was in addition to a significant expansion of the range of flow rates over which the stratified regimes occurred.Kokal and Stmsilav [42] reported that in downward flow the liquid on the base of the pipe moved faster than for the corresponding horizontal condition due to the effect of gravity and resulted in a corresponding lower liquid holdup. In uphill flow the effect was reversed.…”

Section: Pressure Dropmentioning

confidence: 99%

See 2 more Smart Citations

A Study of Two‐Phase Co‐current Flow in Inclined Pipe

Spedding¹,

Ferguson²,

Watterson³

1999

Dev. Chem. Eng. Mineral Process.

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Section: Pressure Dropmentioning

confidence: 90%

Section: Flow Regime Mapsmentioning

confidence: 99%

Section: Pressure Dropmentioning

confidence: 99%

See 1 more Smart Citation

A Study of Two‐Phase Co‐current Flow in Inclined Pipe

Spedding¹,

Ferguson²,

Watterson³

1999

Dev. Chem. Eng. Mineral Process.

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“…They stated that the angle change in the downward ow has the most e ect on the transitions of strati ed ow. Kokal and Stanislav [17] investigated the ow patterns of oil-air two-phase in horizontal pipe and slightly inclined pipes, and they used the quite light oil, 7 mPa.s viscosity, and 858 kg/m 3 density. They also investigated the ow patterns for inclination from {9 to +9 degrees in the pipes with the diameters of 25.8, 51.2, and 76.3 mm.…”

Section: Introductionmentioning

confidence: 99%

Light Oil – Gas Two-Phase Flow Pattern Identification in Different Pipe Orientations: An Experimental Approach

et al. 2017

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Experimental two-phase ow investigation; High-speed photography; Oil-air two-phase ow patterns; Flow maps in inclined pipe.Abstract. In this paper, an experimental study on the ow patterns of two-phase air-light oil ow is performed in a 20 mm diameter pipe with a length of 6 m in di erent orientations with pipe angles in the range of {45 to +45. The ow regimes are captured by a high-speed camera. In the experiments, the following are used: the air with the viscosity of 0.019 mPa.s and the density of 1.2 kg/m 3 as well as the light oil with the viscosity of 2.6 mPa.s and the density of 840 kg/m 3 . During the experiments, di erent ow patterns are observed such as bubbly, slug, smooth strati ed, wavy strati ed, and annular ows. Flow regimes in di erent pipe inclination angles are inspected in a two-phase air-light oil ow, and ow pattern maps are proposed for every pipe inclination angle. In addition, a comprehensive study on the major forces acting on dispersed phase is presented theoretically to perform a thorough discussion on the e ects of pipe inclination angle on transition boundaries between ow patterns in the two-phase air-light oil ow. It is inferred that non-strati ed ows are dominant ow patterns in the upward ows, and strati ed ows are dominant ow patterns in the downward ows.

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“…Although S. L. KOKAL et al [12] carried out an oil and gas two-phase study in the larger diameter 51.2mm and 76.3mm, it was using a small inclination angle. Jing Wang et al [13] also carried out a gas oil two-phase flow study in a pipe with a diameter of 125 mm with less than 15 degree inclined angle.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Gas-Liquid Two-Phase Flow for High Velocity in Inclined Medium Size Tube and Verification of Pressure Calculation Methods

Luo¹,

Li²,

Wang³

et al. 2016

IJHT

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In view of the limited conditions of the previous inclined multiphase pipe flow experiments (diameter and flow) with no reliable adaptability of multiphase pipe flow calculation method which is obtained from this experimental conditions when the using conditions are beyond the scope of the experiment (such as a middle to large diameter and large flow), the gas-liquid two-phase flow experiment was carried out using air and water as the medium with different inclined angles 0°, 15°, 30°, 45°, 60°, 75° and 90° in this paper. The analysis of variation of liquid holdup and pressure drop with different gas and liquid quantities and inclination angles was obtained. The calculation method applicability of liquid holdup and pressure drop were verified and selected from the experimental data, and the error variation law of the calculation methods were analysed. The applicability of the calculation method was compared with its applicability to liquid holdup and pressure drop as verified by the field test data. According to the analysis of the comparative results, the applicability conditions of the existing pressure calculation methods were obtained and they provided the guidance for the selection of the inclined multiphase pipe flow calculation methods under the condition of middle and high production rates.

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An experimental study of two-phase flow in slightly inclined pipes—I. Flow patterns

Cited by 78 publications

References 22 publications

A Study of Two‐Phase Co‐current Flow in Inclined Pipe

A Study of Two‐Phase Co‐current Flow in Inclined Pipe

Light Oil – Gas Two-Phase Flow Pattern Identification in Different Pipe Orientations: An Experimental Approach

Experimental Study of Gas-Liquid Two-Phase Flow for High Velocity in Inclined Medium Size Tube and Verification of Pressure Calculation Methods

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