Optimisation of four-sensor probes for measuring bubble velocity components in bubbly air–water and oil–water flows

Lucas, Gary; Zhao, Xin; Pradhan, Suman

doi:10.1016/j.flowmeasinst.2010.12.004

Cited by 16 publications

(14 citation statements)

References 8 publications

(17 reference statements)

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“…Although the measured result is better than a common single phase flow meter, the cone distorts the flow structure and brings pressure loss. Invasive electrical multiprobes can obtain the velocity of dispersed droplets based on the transit time of droplet moving through probes [5]. However, the inserted probes distort the flow structure and brings pressure loss.…”

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confidence: 99%

Measuring Oil–Water Two-Phase Flow Velocity With Continuous-Wave Ultrasound Doppler Sensor and Drift-Flux Model

Dong

Tan

Yuan

2016

IEEE Trans. Instrum. Meas.

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Oil-water two-phase flow is the main fluid form in petroleum industry. Since it is associated with safety operation and economic benefit, the flow velocity needs to be measured accurately. A method based on continuous-wave ultrasonic Doppler and drift-flux model is presented to estimate the overall superficial flow velocity of oil-water two-phase flow. A theoretical correlation combining velocity profile and drift-flux model was proposed to relate the measured velocity in the sensing volume of the ultrasonic Doppler sensor with the overall superficial velocity of two-phase flow. The measuring system consists of two piezoceramics ultrasonic transducers with a center frequency of 1 MHz and a PXI-based data acquisition system. Dynamic experiments involving five typical flow patterns were performed in a horizontal Plexiglas pipe with an inner diameter of 50 mm. The results show that the measuring system and the proposed method estimate the overall superficial flow velocity with an average error of 2.27%. Index Terms-Continuous-wave ultrasonic Doppler (CWUD), drift-flux model, flow pattern, flow velocity measurement, oil-water two-phase flow.

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mentioning

confidence: 99%

Measuring Oil–Water Two-Phase Flow Velocity With Continuous-Wave Ultrasound Doppler Sensor and Drift-Flux Model

Dong

Tan

Yuan

2016

IEEE Trans. Instrum. Meas.

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“…In [16] a series of criteria were developed (and which were used in the present study) in order to ensure that the group of signals, from which ob t…”

Section: Figure 4 the Geometry Of A Four-sensor Probementioning

confidence: 99%

“…Criteria were also developed in [16] enabling rejection of 'ambiguous' conductance signals such as can arise when the a sensor contacts the droplet very close to the perimeter of the droplet's projected frontal area. [NB it is also explained in [16] how the relative positions of the four sensors in each probe can be optimised in order to minimise the influence of errors in the measured probe…”

Section: Figure 4 the Geometry Of A Four-sensor Probementioning

confidence: 99%

“…at the tips of the needles) both the dual-sensor and four-sensor arrays presented minimal disturbance to the flow. Furthermore the axes of the needles were parallel to the principal direction of motion of the oil droplets which meant that the needles had negligible retarding effect on the motion of the oil droplets [16]. It should also be noted that the proportion of the test section cross sectional area occupied by the frontal areas of the stainless steel probe holders was 0.75% and 0.48% for the dual-sensor and four-sensor arrays respectively, indicating that the probe holders also presented minimal disturbance to the oil-water flow.…”

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confidence: 99%

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Large probe arrays for measuring mean and time dependent local oil volume fraction and local oil velocity component distributions in inclined oil-in-water flows

Lucas

Zhao

2013

Flow Measurement and Instrumentation

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Arrays of dual-sensor and four-sensor needle conductance probes have been used to measure the mean and time dependent local properties of upward inclined, bubbly oil-in-water flows (also known as dispersed oil-in-water flows) in a 153mm diameter pipe. The flow properties that were measured were (i) the local in-situ oil volume fraction α ; (ii) the local oil velocity o u in the axial direction of the pipe (the Z direction); and (iii) the local oil velocity Y u in the direction from the lower side of the inclined pipe to its upper side (the Y direction). Oil velocities in the X direction (orthogonal to the Y and Z directions) were found to be negligible. For all of the flow conditions investigated it was found that the mean value of α varied from a maximum value at the upper side of the inclined pipe to a minimum value at the lower side, and that the rate of decrease of this mean value of α with distance in the Y − direction became greater as the pipe inclination angle θ from the vertical was increased. It was also found that the mean value of o u was greatest at the upper side of the inclined pipe and decreased towards the lower side of the inclined pipe, the rate of decrease with distance in the Y − direction again becoming greater as θ was increased. it was found that the standard deviation in the cross-pipe oil velocity component Y u was approximately equal to the standard deviation in the axial velocity component o u . These large temporal variations in the local flow properties have been attributed to the presence of large scale Kelvin-Helmholtz waves which intermittently appear in the flow. It is believed that the techniques outlined in this paper for measuring the standard deviation of local flow properties as a function of the sampling period T will be of considerable value in validating mathematical models of time dependent oilwater flows. It should be noted that the principal focus of this paper is on the measurement techniques that were used and the methods of data analysis rather than the presentation of exhaustive experimental results at numerous different flow conditions.

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“…Conductivity probes are used widely to measure various flow characteristics of bubbly multiphase flows within pipelines [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Wu et al [16] have shown that a dual-sensor probe can be used to measure the time averaged velocity and interfacial area concentration of the dispersed phase in air-water multiphase flows with reasonable accuracy.…”

Section: Introductionmentioning

confidence: 99%

Optimal design of a four-sensor probe system to measure the flow properties of the dispersed phase in bubbly air–water multiphase flows

Pradhan

Mishra

Ubbi

et al. 2013

Sensors and Actuators A: Physical

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Optimisation of four-sensor probes for measuring bubble velocity components in bubbly air–water and oil–water flows

Cited by 16 publications

References 8 publications

Measuring Oil–Water Two-Phase Flow Velocity With Continuous-Wave Ultrasound Doppler Sensor and Drift-Flux Model

Measuring Oil–Water Two-Phase Flow Velocity With Continuous-Wave Ultrasound Doppler Sensor and Drift-Flux Model

Large probe arrays for measuring mean and time dependent local oil volume fraction and local oil velocity component distributions in inclined oil-in-water flows

Optimal design of a four-sensor probe system to measure the flow properties of the dispersed phase in bubbly air–water multiphase flows

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