The application of the Acoustic Emission (AE) technology to the measurement of gas void fraction in two-phase (gasliquid) flow undergoing slug flow conditions is explored in this paper. A purpose built experimental facility that allowed for investigations over a range of a superficial liquid velocities (0.3 to 2.3 ms~(-1)) and superficial gas velocities (0.2 to 1.4 ms~(-1)) was employed. Measurements of AE for varying gas void fractions were compared to conductive probe measurements and results showed a direct correlation between AE absolute energy and the gas void fraction.
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