Innovative Techniques For Two-Phase Flow Measurements

Two-phase flow is important in an increasing number of applications and industries. For example, the safety analysis codes for the nuclear energy industry require closure relations for the vapor-liquid interfacial transfer terms, while accurate two-phase pressure drop models are necessary to design the piping systems in the oil and gas industry. Also, two-phase flow occurs in heat exchangers, steam generators, chemical reactors, oil transportation and many other process equipments. In addition, development of accurate and suitable instrumentations for on-line monitoring and measurement of the solids concentration and velocity in gas-solid two-phase flows has proven to be a challenging problem with many scientists and engineers worldwide developing novel techniques for this application. This paper presents a review on the electrical-based measurement techniques for gas-solid and gas-liquid two-phase flows along with the most recent patents developed for two-phase flow measurements. Also, development of a novel method for the design of capacitance sensors for void fraction measurement and flow pattern identification was presented in detail.

[1]  A. Kendoush,et al.  Improving the accuracy of the capacitance method for void fraction measurement , 1995 .

[2]  F. Garcia-Nocetti,et al.  Visualisation of gas–oil two-phase flows in pressurised pipes using electrical capacitance tomography , 2005 .

[3]  A. J. Reynolds.  Flowing Gas-Solids Suspensions . By R. G. B OOTHROYD . Chapman & Hall, 1971. 289 pp. £4.30. , 1972 .

[4]  W. Heerens.  Application of capacitance techniques in sensor design , 1986 .

[5]  H. Wegleiter,et al.  A Dual Mode Ultrasound and Electrical Capacitance Process Tomography Sensor , 2005, IEEE Sensors, 2005..

[6]  Steven L. Ceccio,et al.  Capacitance measurements of solid concentration in gas–solid flows , 2003 .

[7]  R. G. Green,et al.  Sensor systems for lightly loaded pneumatic conveyors , 1998 .

[8]  J. C. Borst,et al.  A CAPACITANCE SENSOR FOR TWO-PHASE VOID FRACTION MEASUREMENT AND FLOW PATTERN IDENTIFICATION , 1988 .

[9]  W. Ahmed,et al.  Capacitance Sensors for Void-Fraction Measurements and Flow-Pattern Identification in Air–Oil Two-Phase Flow , 2006, IEEE Sensors Journal.

[10]  S. Simonian,et al.  Towards a phase-distribution-independent impedance volume-fraction measurement , 1991 .

[11]  Wael H. Ahmed,et al.  Characteristics of Air-Oil Two-Phase Flow Across a Sudden Expansion , 2003 .

[12]  Tomasz Dyakowski,et al.  Application of electrical capacitance tomography for measurement of gas-solids flow characteristics in a pneumatic conveying system , 2001 .

[13]  Richard A Williams,et al.  Real time visualisation and analysis of dense phase powder conveying , 1999 .

[14]  Tomasz Dyakowski,et al.  Application of capacitance tomography to gas-solid flows , 1997 .

[15]  Brian E. Williams,et al.  Experimental comparison of flow pattern detection techniques for air-water mixture flow , 1999 .

[16]  Kamiel S. Rezkallah,et al.  A capacitance sensor for the characterization of microgravity two-phase liquid-gas flows , 1999 .

[17]  Owen C. Jones,et al.  The interrelation between void fraction fluctuations and flow patterns in two-phase flow , 1975 .

[18]  Yong Yan,et al.  Mass flow measurement of pneumatically conveyed solids using radiometric sensors , 2000 .

[19]  E. Hammer,et al.  Capacitance Transducers for Non-intrusive Measurement of Water in Crude Oil , 1989 .

[20]  Kamiel S. Rezkallah,et al.  Void fraction measurements in gas - liquid flows using capacitance sensors , 1996 .

[21]  M. Merilo,et al.  Void Fraction Measurement With a Rotating Electric Field Conductance Gauge , 1977 .

[22]  Maurice Beck,et al.  Tomographic imaging of two-component flow using capacitance sensors , 1989 .

[23]  Tomasz Dyakowski,et al.  Applications of electrical tomography for gas-solids and liquid-solids flows : a review , 2000 .

[24]  Pranab K. Dutta,et al.  PC-based gas-solids two-phase mass flowmeter for pneumatically conveying systems , 2000 .

[25]  G. Brown,et al.  Development of an ultrasonic tomography system for application in pneumatic conveying , 1996 .