Radio-frequency probe for bubble size and velocity measurements

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1135692· OSTI ID:5915152

Abuaf, N; Feierabend, T P; Zimmer, G A; Jones, Jr, O C

A radio frequency (rf) probe that can provide local void fraction and interface velocity measurements in a gas--liquid two-phase flow was developed. The probe response to bubble passage was investigated with single-bubble controlled experiments. For a fixed geometry, the probe response was dependent on the dielectric constant of the medium surrounding the probe tip (air or water) and on the frequency of the carrier signal supplied to the probe. Bubble lengths (< 1 cm) and average bubble approach velocities (< 160 cm/s) were independently measured by two light sources and detectors placed at a known distance from each other and sensing the passage of each bubble. By choosing a sensitive probe tip length of 2.75--3 mm, the rf probe output provided enough information to determine the bubble length and velocity. The results obtained by the two independent methods show reasonable agreement ( +- 10%).

• Research Organization: Brookhaven National Laboratory, Thermal Hydraulic Development Division, Department of Nuclear Energy, Upton, New York 11973
• OSTI ID: 5915152
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 50:10; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer &amp; Fluid Flow
BUBBLES
COMPARATIVE EVALUATIONS
DATA
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
FLUID FLOW
FREQUENCY DEPENDENCE
GEOMETRY
INFORMATION
INTERFACES
MATHEMATICS
PHYSICAL PROPERTIES
PROBES
QUANTITY RATIO
TWO-PHASE FLOW
VELOCITY
VOIDS