Fast Wire-Mesh Sensor for Two-Phase Flow Visualisation with 10 000 Frames per Second

Prasser, Horst-Michael; Zschau, Jochen; Peters, D.; Pietzsch, Gerd; Taubert, Wolfgang; Trepte, Manuel

doi:10.1002/1522-2640(200106)73:6<743::aid-cite7431111>3.0.co;2-s

Cited by 8 publications

(4 citation statements)

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“…The various frames acquired during a measurement are saved in a 64 × 64 × N t data matrix in computer memory, where 64 is the number of transmitter and receiver electrodes and N t denotes the number of times steps. The electronics is able to produce up to 2500 images per second [10]. …”

Section: System Designmentioning

confidence: 99%

Planar Array Sensor for High-speed Component Distribution Imaging in Fluid Flow Applications

Silva

Sühnel

Schleicher

et al. 2007

Sensors

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A novel planar array sensor based on electrical conductivity measurements is presented which may be applied to visualize surface fluid distributions. The sensor is manufactured using printed-circuit board fabrication technology and comprises of 64 × 64 interdigital sensing structures. An associated electronics measures the electrical conductivity of the fluid over each individual sensing structure in a multiplexed manner by applying a bipolar excitation voltage and by measuring the electrical current flowing from a driver electrode to a sensing electrode. After interrogating all sensing structures, a two-dimensional image of the conductivity distribution over a surface is obtained which in turn represents fluid distributions over sensor's surface. The employed electronics can acquire up to 2500 frames per second thus being able to monitor fast transient phenomena. The system has been evaluated regarding measurement accuracy and depth sensitivity. Furthermore, the application of the sensor in the investigation of two different flow applications is presented.

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Section: System Designmentioning

confidence: 99%

Planar Array Sensor for High-speed Component Distribution Imaging in Fluid Flow Applications

Silva

Sühnel

Schleicher

et al. 2007

Sensors

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“…6. To achieve the realistic structure, the imaginary time (t * ) is interpreted as the stream wise distance scaled with the cross-sectional averaged true gas velocity as performed by Prasser et al 11) In this case, the applied true gas velocity is directly calculated from the analysis of the time a bubble migrates from one point on one measured plane to the peripheral measured point of the opposite plane. 12) The contour level (ε level ) of each flow condition is selected differently to minimize the unrealistic fragments and unrealistic unification due to the non-appropriate threshold level selection reported in Prasser et al 13) From the results, the gas-liquid flow structures of small size bubble, intermediate size bubble and bubble-slug combination are observed for U G =2.5, 20 and 50 mm/s respectively.…”

Section: Flow Disturbance Between Two Measuring Plane Of Wmtmentioning

confidence: 99%

“…The achievement of the gas velocity, bubble size and superficial gas velocity evaluation has been developed in the past. [11][12][13] However, due to the intrusive feature, the influence of the wire sensor on the measurement and on the flow characteristic has to be carefully considered. The disturbance level due to the wire mesh sensor mainly depends on the sensor configuration such as wire diameter, material, spatial resolution, etc.…”

Section: Introductionmentioning

confidence: 99%

Intrusive Effect of Wire Mesh Tomography on Gas-liquid Flow Measurement

Wangjiraniran

Motegi

Richter³

et al. 2003

Journal of Nuclear Science and Technology

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To investigate the accuracy of wire mesh tomography (WMT) for gas-liquid flow measurement, the experimental study focused on its intrusive feature has been carried out. The WMT principle is based on the dependency upon electrical conductivity on the local void fraction. The applied wire mesh sensor (WMS) consists of two measuring planes. Each plane has 8×32 crossing points with spatial resolution of 2.22×3.03 mm 2 and wire diameter of 0.125 mm.The disturbance level is estimated from the deviation of flow properties between each measuring plane of WMT and also from the alternative image processing for low gas intensity range. The results show the dependency of disturbance level on the void fraction shape. Furthermore, the contribution of deceleration and deformation on the flow disturbance related to the flow condition are presented. In addition, the capability of gas velocity evaluation method is confirmed and the intrusive effect becomes only one important parameter for gas velocity measurement.

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“…Cross-section averaged gas fractions as well as radial gas fraction profiles can be calculated [34]. Radial gas velocity profiles were obtained by means of a point-topoint cross-correlation between the signals of both sensors placed in a distance of 63 mm behind each other [35]. Bubble size distributions were extracted from the measuring data using the algorithm described by [36].…”

Section: Experimental Data On Topflow Loop On Two Phasementioning

confidence: 99%

Review of Available Data for Validation of Nuresim Two‐Phase CFD Software Applied to CHF Investigations

Bestion

Anglart

Caraghiaur

et al. 2008

Science and Technology of Nuclear Installations

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The NURESIM Project of the 6th European Framework Program initiated the development of a new-generation common European Standard Software Platform for nuclear reactor simulation. The thermal-hydraulic subproject aims at improving the understanding and the predictive capabilities of the simulation tools for key two-phase flow thermal-hydraulic processes such as the critical heat flux (CHF). As part of a multi-scale analysis of reactor thermal-hydraulics, a two-phase CFD tool is developed to allow zooming on local processes. Current industrial methods for CHF mainly use the sub-channel analysis and empirical CHF correlations based on large scale experiments having the real geometry of a reactor assembly. Two-phase CFD is used here for understanding some boiling flow processes, for helping new fuel assembly design, and for developing better CHF predictions in both PWR and BWR. This paper presents a review of experimental data which can be used for validation of the two-phase CFD application to CHF investigations. The phenomenology of DNB and Dry-Out are detailed identifying all basic flow processes which require a specific modeling in CFD tool. The resulting modeling program of work is given and the current state-of-the-art of the modeling within the NURESIM project is presented.

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Fast Wire-Mesh Sensor for Two-Phase Flow Visualisation with 10 000 Frames per Second

Cited by 8 publications

References 0 publications

Planar Array Sensor for High-speed Component Distribution Imaging in Fluid Flow Applications

Planar Array Sensor for High-speed Component Distribution Imaging in Fluid Flow Applications

Intrusive Effect of Wire Mesh Tomography on Gas-liquid Flow Measurement

Review of Available Data for Validation of Nuresim Two‐Phase CFD Software Applied to CHF Investigations

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