Development of Conductivity Sensors for Multi-Phase Flow Local Measurements at the Polytechnic University of Valencia (UPV) and University Jaume I of Castellon (UJI)

This paper describes all the procedures and methods currently used at UPV (Universitat Politécnica de Valencia) and UJI (University Jaume I) for the development and use of sensors for multi-phase flow analysis in vertical pipes. This paper also describes the methods that we use to obtain the values of the two-phase flow magnitudes from the sensor signals and the validation and cross-verification methods developed to check the consistency of the results obtained for these magnitudes with the sensors. First, we provide information about the procedures used to build the multi-sensor conductivity probes and some of the tests performed with different materials to avoid sensor degradation issues. In addition, we provide information about the characteristics of the electric circuits that feed the sensors. Then the data acquisition of the conductivity probe, the signal conditioning and the data processing including the device that have been designed to automatize all the measurement process of moving the sensors inside the channels by means of stepper electric motors controlled by computer are shown in operation. Then, we explain the methods used for bubble identification and categorization. Finally, we describe the methodology used to obtain the two-phase flow information from the sensor signals. This includes the following items: void fraction, gas velocity, Sauter mean diameter and interfacial area concentration. The last part of this paper is devoted to the conductance probes developed for the annular flow analysis, which includes the analysis of the interfacial waves produced in annular flow and that requires a different type of sensor.

[1]  Horst-Michael Prasser,et al.  High-speed liquid film sensor for two-phase flows with high spatial resolution based on electrical conductance , 2009 .

[2]  Mamoru Ishii,et al.  Numerical evaluation and correction method for multi-sensor probe measurement techniques in two-phase bubbly flow , 2002 .

[3]  Mamoru Ishii,et al.  Experimental study on interfacial area transport in bubbly two-phase flows , 1999 .

[4]  Florentina Bunea,et al.  Experimental PIV and LIF characterization of a bubble column flow , 2017 .

[5]  M. Ishii,et al.  One-dimensional drift-flux model and constitutive equations for relative motion between phases in various two-phase flow regimes , 2003 .

[6]  Robert Banasiak,et al.  Study on two-phase flow regime visualization and identification using 3D electrical capacitance tomography and fuzzy-logic classification , 2014 .

[7]  Mamoru Ishii,et al.  Study on interfacial structures in slug flows using a miniaturized four-sensor conductivity probe , 2001 .

[8]  S. Martínez-Martínez,et al.  A criterion for the transition from wall to core peak gas volume fraction distributions in bubbly flows , 2012 .

[9]  Mamoru Ishii,et al.  Theory and measurement of local interfacial area using a four sensor probe in two-phase flow , 1993 .

[10]  Mamoru Ishii,et al.  Sensitivity study on double-sensor conductivity probe for the measurement of interfacial area concentration in bubbly flow , 1999 .

[11]  B. Kulkarni,et al.  Simultaneous measurement of hold-up profiles and interfacial area using LDA in bubble columns: predictions by multiresolution analysis and comparison with experiments , 2001 .

[12]  J. Muñoz-Cobo,et al.  Monte-Carlo calculation of the calibration factors for the interfacial area concentration and the velocity of the bubbles for double sensor conductivity probe , 2007 .

[13]  K. Welter,et al.  Theoretical studies on the design criteria of double-sensor probe for the measurement of bubble velocity , 2001 .

[14]  M W E Coney,et al.  The theory and application of conductance probes for the measurement of liquid film thickness in two-phase flow , 1973 .

[15]  Annalisa Manera,et al.  Comparison between wire-mesh sensors and conductive needle-probes for measurements of two-phase flow parameters , 2009 .

[16]  Dong-Jin Euh,et al.  Development of the five-sensor conductivity probe method for the measurement of the interfacial area concentration , 2001 .

[17]  L. Hernández,et al.  EXPERIMENTAL STUDY ON TWO-PHASE FLOW CHARACTERISTICS USING CONDUCTIVITY PROBES AND LASER DOPPLER ANEMOMETRY IN A VERTICAL PIPE , 2009 .

[18]  Mamoru Ishii,et al.  Local formulation and measurements of interfacial area concentration in two-phase flow , 1986 .

[19]  Sergio Chiva,et al.  Simulation of bubbly flow in vertical pipes by coupling Lagrangian and Eulerian models with 3D random walks models: Validation with experimental data using multi-sensor conductivity probes and Laser Doppler Anemometry , 2012 .

[20]  A. M. Judd.  Convective Boiling and Condensation. , 1973 .

[21]  H. Prasser,et al.  Multi-range sensors for the measurement of liquid film thickness distributions based on electrical conductance , 2014 .

[22]  M. Essa,et al.  Experiments performed with bubbly flow in vertical pipes at different flow conditions covering the transition region : simulation by coupling Eulerian, Lagrangian and 3D random walks models , 2012 .

[23]  Santos Mendez Diaz.  Medida experimental de la concentración de área interfacial en flujos bifásicos finalmente dispersos y en transición. , 2011 .

[24]  Eugênio Spanó Rosa,et al.  Statistical method to calculate local interfacial variables in two-phase bubbly flows using intrusive crossing probes , 2000 .

[25]  Wayne William Philip Clark,et al.  The interfacial characteristics of falling film reactors , 2001 .

[26]  J. Delhaye,et al.  Interfacial area in bubbly flow: experimental data and correlations , 1994 .

[27]  Uwe Hampel,et al.  Void measurement using high-resolution gamma-ray computed tomography , 2011 .

[28]  Hideo Nakamura,et al.  Methodological improvement of an intrusive four-sensor probe for the multi-dimensional two-phase flow measurement , 2005 .

[29]  Hideo Nakamura,et al.  Error reduction, evaluation and correction for the intrusive optical four-sensor probe measurement in multi-dimensional two-phase flow , 2008 .

[30]  Kerstin Eckert,et al.  Measuring the diameter of rising gas bubbles by means of the ultrasound transit time technique , 2015 .

[31]  Mamoru Ishii,et al.  Development of the Miniaturized Four-sensor Conductivity Probe and the Signal Processing Scheme , 2000 .

[32]  M. Ishii,et al.  Axial interfacial area transport of vertical bubbly flows , 2001 .