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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.

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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.

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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.