Surface electrical impedance probes are used to examine the bubbly flow beneath and in the closure region of partial attached cavities. A series of electrodes were mounted flush to the surface of a cavitating hydrofoil to detect the presence of liquid or vapor through changes in the impedance of the local fluid medium. Signals from the electrical probes were used to determine the near-surface gas-phase velocity and the shedding frequency of the gas phase. The impedance technique is shown to have the potential to measure advection velocities within a partial cavity, and the frequency content of the signal is used to determine the dynamics of the vapor shedding process. [S0098-2202(00)00501-0]

Issue Section:
Technical Papers
Keywords:
two-phase flow, bubbles, flow measurement, cavitation, electric impedance, probes
Topics:
Cavities, Electrodes, Probes, Impedance (Electricity), Bubbly flow, Signals
1.
Brennen, C. E., 1995, Cavitation and Bubble Dynamics, Oxford University Press, New York, NY.
2.
Franc, J. P., Avellan, F., Belahadji, B., Billard, J. Y., Brianc¸on-Marjollet, L., Fre´chou, D., Fruman, D. H., Karimi, A., Kueny, J. L., and Michel, J.-M., 1995, La Cavitation, Me´canismes Physiques et Aspects Industriels, Presses Universitaires de Grenoble, Collection Grenoble Science.
3.
Knapp, R. T., Daily, J. W., and Hammit, F. G., 1970, Cavitation, McGraw-Hill, New York.
4.
Furness
,
R. A.
, and
Hutton
,
S. P.
,
1975
, “
Experimental and Theoretical Studies of Two-Dimensional Fixed-Type Cavities
,”
ASME J. Fluids Eng.
,
97
, pp.
515
–
522
.
5.
Le
,
Q.
,
Franc
,
J. P.
, and
Michel
,
J. M.
,
1993
, “
Partial Cavities: Global Behavior and Mean Pressure Distribution
,”
ASME J. Fluids Eng.
,
115
, pp.
243
–
248
.
6.
Le
,
Q.
,
Franc
,
J. P.
, and
Michel
,
J. M.
,
1993
, “
Partial Cavities: Pressure Pulse Distribution Around Cavity Closure
,”
ASME J. Fluids Eng.
,
115
, pp.
249
–
254
.
7.
de Lange, D. F., 1996, “Observation and Modeling of Cloud Cavitation Behind a Sheet Cavity,” Ph.D. thesis, University of Twente, The Netherlands.
8.
Pham, T. M., Larrarte, F., and Fruman, D. H., 1998, “Investigation of Unstable Cloud Cavitation,” Proceedings of the Third International Symposium on Cavitation, J. M. Michel and H. Kato. eds., published by Laboratorie des Ecoulements Ge´ophysiques et Industriels, Grenoble, France, pp. 215–220.
9.
Callenaera, M., Franc, J. P., and Michel, J.-M., 1998, “Influence of Cavity Thickness and Pressure Gradient on the Unsteady Behavior of Partial Cavities,” Proceedings of the Third International Symposium on Cavitation, J. M. Michel and H. Kato, eds., published by Laboratorie des Ecoulements Ge´ophysiques et Industriels, Grenoble, France, pp. 209–214.
10.
Kawanami
,
Y.
,
Kato
,
H.
,
Yamaguchi
,
H.
,
Tanimura
,
M.
, and
Tagaya
,
Y.
,
1997
, “
Mechanisms and Control of Cloud Cavitation
,”
ASME J. Fluids Eng.
,
119
, pp.
788
–
795
.
11.
Franc, J. P., 1998, private communication.
12.
Ceccio, S. L., and George, D. L., 1997, “An Electrical Impedance Method for Measurements of Attached Cavitation,” Proceedings of the 1997 ASME International Mechanical Engineering Conference and Exposition, FED-Vol. 244, pp. 338–345.
13.
George, D. L., and Ceccio, S. L., 1995, “Cavitation and Multiphase Flow Laboratory at the University of Michigan,” Proceedings of the Twenty-Fourth American Towing Tank Conference, P. Johnson, ed., published by Iowa Institute of Hydraulic Research, University of Iowa, Iowa City, pp. 1–9.
14.
Ceccio
,
S. L.
, and
George
,
D. L.
,
1996
, “
A Review of Electrical Impedance Techniques for the Measurement of Multiphase Flows
,”
ASME J. Fluids Eng.
,
118
, pp.
391
–
399
.
15.
Bendat, J. S., and Piersol, A. G., 1986, Random Data, Wiley, New York, NY.
16.
Laberteaux, K. R., and Ceccio, S. L., 1998, “Partial Attached Cavitation on Two- and Three-Dimensional Hydrofoils,” Proceedings of the Twenty Second Symposium on Naval Hydrodynamics, Washington, DC.
17.
Kawanami, Y., Kato, H., and Yamaguchi, H., 1998, “Three-Dimensional Characteristics of the Cavities Formed on a Two-Dimensional Hydrofoil,” Proceedings of the Third International Symposium on Cavitation, J. M. Michel amd H. Kato, ed., published by Laboratoire des Ecoulements Ge´ophysiques et Industriels, Grenoble, France, pp. 191–196.
Copyright © 2000
 by ASME
You do not currently have access to this content.