High-speed liquid film sensor for two-phase flows with high spatial resolution based on electrical conductance

Damsohn, Manuel; Prasser, Horst-Michael

doi:10.1016/j.flowmeasinst.2008.06.006

Cited by 83 publications

(34 citation statements)

References 26 publications

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“…Field measurements of local film thickness using sets with a large number of flush-mounted conductivity probes were performed by Sekoguchi et al (1985Sekoguchi et al ( , 1997 and, more recently, by Damsohn and Prasser (2009) and Belt et al (2010). The spatial resolution of flush-mounted conductivity probes is limited by film thickness, which is the characteristic being measured; the greater the film thickness, the larger the conductivity probe, and, therefore, the lower the spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

Application of a high-speed laser-induced fluorescence technique for studying the three-dimensional structure of annular gas–liquid flow

Алексеенко

Cherdantsev

et al. 2011

Exp Fluids

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The wavy structure of liquid film in annular gas-liquid flow was studied using a high-speed modification of the laser-induced fluorescence (LIF) technique, which was adapted for three-dimensional measurements. The three-dimensional structure of different types of waves in regimes with and without liquid entrainment was investigated. A comparison of the circumferential size of different types of waves was performed. Disturbance waves at high liquid Reynolds numbers were shown to be circumferentially non-uniform, and it was shown that this non-uniformity affects the generation of ripples.

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Section: Introductionmentioning

confidence: 99%

Application of a high-speed laser-induced fluorescence technique for studying the three-dimensional structure of annular gas–liquid flow

Алексеенко

Cherdantsev

et al. 2011

Exp Fluids

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“…An auto-balancing bridge was used to measure conductance using a resistance in the feedback network in (Damsohn and Prasser, 2009a) and capacitance using a pair resistance-capacitor in the feedback network in (Thiele et al, 2009). …”

Section: Circuitsmentioning

confidence: 99%

“…The conductance sensor system, designed in Swiss Federal Institute of Technology Zurich (ETHZ) (Damsohn and Prasser, 2009a), has 64 x 16 measuring points and measuring area of 128mm x 32mm and a time resolution of 10000fps. The system can measure films between 100µm and 700µm with spatial resolution of 2mm × 2mm.…”

Section: Conductance Systemmentioning

confidence: 99%

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

2015

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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.

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“…The characteristic parameters of annular flow include the thickness of the liquid film, wave velocity, wave height, and shear force, and the liquid film thickness is the basic and most important parameter to be measured accurately [2]. There are many methods that have been developed to investigate the liquid film in gas-liquid annular flow.…”

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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High-speed liquid film sensor for two-phase flows with high spatial resolution based on electrical conductance

Cited by 83 publications

References 26 publications

Application of a high-speed laser-induced fluorescence technique for studying the three-dimensional structure of annular gas–liquid flow

Application of a high-speed laser-induced fluorescence technique for studying the three-dimensional structure of annular gas–liquid flow

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

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

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