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Optical probe for local void fraction and interface velocity measurements.
N Abuaf1, O C Jones, G A Zimmer
1Brookhaven National Laboratory, Department of Nuclear Energy, Experimental Modeling Group, Upton, New York 11973.
The Review of Scientific Instruments
|August 1, 1978
Summary
A miniaturized optical probe was developed to measure void fraction and interface velocities in liquid-vapor two-phase flows. This probe accurately captures unsteady flow dynamics with minimal disturbance, enabling precise local measurements.
Area of Science:
- Fluid Dynamics
- Optical Measurement Techniques
- Two-Phase Flow
Background:
- Accurate measurement of local void fraction and interface velocities is crucial for understanding liquid-vapor two-phase flows.
- Traditional probes can disturb the flow field, affecting measurement accuracy.
Purpose of the Study:
- To develop and describe a miniaturized optical probe for measuring unsteady local void fraction and interface velocities.
- To minimize flow field disturbances caused by the probe.
Main Methods:
- Development of an optical probe with a controlled, miniaturized tip geometry.
- Experimental investigation of the probe's electronic and hydrodynamic responses.
- Calibration of the probe for accurate measurements.
Main Results:
- The optical probe demonstrated sensitivity to both interface velocities and the phase present at the tip.
- A theoretical explanation for the probe's behavior was proposed.
- The probe successfully measured local void fractions and interface velocities within the tested range.
Conclusions:
- The developed optical probe is effective for measuring unsteady local void fraction and interface velocities in two-phase flows.
- Miniaturization successfully reduced flow field disturbances.
- Proper calibration ensures the probe's reliability for quantitative analysis.
