Capacitance sensors for void-fraction measurements and flow-pattern identification in air-oil two-phase flow

被引:89
作者
Ahmed, Wael H. [1 ]
机构
[1] Atom Energy Canada Ltd, Component Life Technol Branch, Chalk River Labs, Chalk River, ON K0J 1P0, Canada
关键词
air-oil two-phase flow; capacitance sensors; void fraction;
D O I
10.1109/JSEN.2006.881390
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The design methodology of capacitance sensors for void-fraction measurement in adiabatic two-phase flow systems is presented in this paper. The effect of design parameters on the capacitance output has been theoretically and experimentally investigated for two types of sensor configurations: concave and ring types. Experiments were performed using air-oil two-phase flow to determine the signal-to-noise ratio, sensitivity, and time response of the capacitance sensors. The results show. that the ring-type sensors are more sensitive to the void-fraction signal than the concave type for the same spatial resolution. The predictions from the theoretical model for the ring-type sensors are in better agreement with the experimental results than for the concave type. The mean value, time trace, power spectral density (PSD), and the probability density function (PDF) of the void-fraction signal from the capacitance sensors are used to objectively identify the flow pattern. The method was validated using high-speed video images of the flow and comparing the results to those from the signal analysis.
引用
收藏
页码:1153 / 1163
页数:11
相关论文
共 15 条
[1]  
ANDRIA G, 1989, RIV ITAL PED, V15, P6
[2]  
CHANG JS, 1984, MASS FLOW MEASUREMEN
[3]   Void fraction measurements in gas-liquid flows using capacitance sensors [J].
Elkow, KJ ;
Rezkallah, KS .
MEASUREMENT SCIENCE AND TECHNOLOGY, 1996, 7 (08) :1153-1163
[4]   Visualisation of gas-oil two-phase flows in pressurised pipes using electrical capacitance tomography [J].
Gamio, JC ;
Castro, J ;
Rivera, L ;
Alamilla, J ;
Garcia-Nocetti, F ;
Aguilar, L .
FLOW MEASUREMENT AND INSTRUMENTATION, 2005, 16 (2-3) :129-134
[5]   A CAPACITANCE SENSOR FOR 2-PHASE VOID FRACTION MEASUREMENT AND FLOW PATTERN IDENTIFICATION [J].
GERAETS, JJM ;
BORST, JC .
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 1988, 14 (03) :305-320
[6]  
Hammer E.A., 1989, FLOW MEAS INSTRUM, V1, P51
[7]   APPLICATION OF CAPACITANCE TECHNIQUES IN SENSOR DESIGN [J].
HEERENS, WC .
JOURNAL OF PHYSICS E-SCIENTIFIC INSTRUMENTS, 1986, 19 (11) :897-906
[8]   TOMOGRAPHIC IMAGING OF 2-COMPONENT FLOW USING CAPACITANCE SENSORS [J].
HUANG, SM ;
PLASKOWSKI, AB ;
XIE, CG ;
BECK, MS .
JOURNAL OF PHYSICS E-SCIENTIFIC INSTRUMENTS, 1989, 22 (03) :173-177
[9]  
Jones O. C. Jr., 1975, International Journal of Multiphase Flow, V2, P273, DOI 10.1016/0301-9322(75)90015-4
[10]   IMPROVING THE ACCURACY OF THE CAPACITANCE METHOD FOR VOID FRACTION MEASUREMENT [J].
KENDOUSH, AA ;
SARKIS, ZA .
EXPERIMENTAL THERMAL AND FLUID SCIENCE, 1995, 11 (04) :321-326