A capacitive sensor system for the analysis of two-phase flows of oil and conductive water

Demori, Marco; Ferrari, Vittorio; Strazza, Domenico; Poesio, Pietro

doi:10.1016/j.sna.2010.08.018

Cited by 120 publications

(49 citation statements)

References 21 publications

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“…Accurate void fraction measurements are challenging, and in most cases where void fractions were measured it was done using only one sensor for the entire test section (Ahmed, 2011;Da Silva et al, 2010;De Kerpel et al, 2013;Demori et al, 2010). This is perhaps not an accurate representation of the average void fraction of a test section that changes between the inlet and outlet.…”

Section: Introductionmentioning

confidence: 99%

The influence of inclination angle on void fraction and heat transfer during condensation inside a smooth tube

Olivier

Meyer

Paepe

et al. 2016

International Journal of Multiphase Flow

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Most work in literature on condensation in tubes has been done for smooth tubes in the horizontal and vertical configurations. Recent experimental works with condensation at different inclination angles showed that the heat transfer characteristics were a function of inclination angle. These works were limited to heat transfer and pressure drop measurements with visual observations. However, no work has been done on measuring the void fractions during condensation at different inclination angles. The purpose of this study was to measure void fractions and heat transfer coefficients during condensation for tube inclinations ranging from vertical downwards (-90ᵒ) to vertical upwards (90ᵒ) at a saturation temperature of 40 ᵒC. Measurements were taken in an experimental set-up in which condensation occurred on the inside of a test section. The test section was a circular tube with an inner diameter of 8.38 mm and a heat transfer length of 1.488. The refrigerant used was R134a, and the void fractions were measured using two capacitive void fraction sensors. Mass fluxes ranging from 100 -400 kg/m 2 .s and vapour qualities ranging from 10 -90% were considered. Heat transfer coefficients were also compared with void fractions. It was found that at combinations of low mass fluxes and vapour qualities, void fraction and heat transfer were significantly affected by changes in inclination angle. Generally, void fractions and heat transfer coefficients increased with downward inclination angles with an optimum angle between -10ᵒ and -30ᵒ (downward flow). At some intermediate mass flux and vapour quality conditions, the void fraction and heat transfer coefficients were observed to be independent of the inclination angle despite changes in the prevailing flow patterns.2

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Section: Introductionmentioning

confidence: 99%

The influence of inclination angle on void fraction and heat transfer during condensation inside a smooth tube

Olivier

Meyer

Paepe

et al. 2016

International Journal of Multiphase Flow

View full text Add to dashboard Cite

show abstract

“…where Z represents the impedance between exciting and measuring electrodes, and the admittance is Y = 1/Z [30]. Accordingly, the output of C/V transition circuit is…”

Section: Capacitance Measuring Circuitmentioning

confidence: 99%

Liquid holdup measurement with double helix capacitance sensor in horizontal oil–water two-phase flow pipes

Zhai

Jin

Gao

et al. 2015

Chinese Journal of Chemical Engineering

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“…The method based on the conductance measurement of the liquid film thickness is simple and reliable, but it only can achieve a single local point measurement and may interfere with the flow field. Then many sensors are developed to achieve the multiple points measurement [4][5][6][7]. Based on the circumferential array of conductance probes, Andreussi et al [8] measured the thickness distribution around the pipe wall of a liquid layer flowing in near horizontal pipes.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Circumferential Liquid Film Based on LIF and Virtual Stereo Vision Sensor

Xue¹,

Lin²,

Yang

2016

Journal of Sensors

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Gas-liquid annular flow is widely used in many industrial applications such as petroleum, chemical, and nuclear engineering. The feature parameters of liquid film in the annular flow are of great significance to understand the flow characteristics and measure the flow precisely. For the annular flow, the circumferential features of liquid film are more important than the axial features to acquire abundant flow structures and reveal the flow mechanism. In the paper, a measurement platform based on the laser-induced fluorescence (LIF) and virtual stereo vision sensor is presented. The virtual stereo vision sensor comprises a high-speed camera and two optical reflection sets, which can acquire the liquid film from two views simultaneously and reconstruct the features of liquid film. Image processing techniques are proceeded with to extract the feature parameters of liquid film; then the circumferential flow characteristic can be reconstructed by views transformation and fusion. The flow characteristic based on the thickness distribution is analysed. The experimental results show that the method is valid and effective, which can give a more detailed and accurate description for the liquid film in annular flows.

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A capacitive sensor system for the analysis of two-phase flows of oil and conductive water

Cited by 120 publications

References 21 publications

The influence of inclination angle on void fraction and heat transfer during condensation inside a smooth tube

The influence of inclination angle on void fraction and heat transfer during condensation inside a smooth tube

Liquid holdup measurement with double helix capacitance sensor in horizontal oil–water two-phase flow pipes

Measurement of Circumferential Liquid Film Based on LIF and Virtual Stereo Vision Sensor

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