Abstract
Two different impedance tube configurations were used to make phase speed measurements of a bubbly liquid. One setup consisted of a vertical water-filled tube with hypodermic needles near the top end to provide a bubbly termination. In this setup, the source was at the bottom of the tube. The second setup was a vertical tube partially filled with water with hypodermic needles at the bottom. In this setup, the source was at the top and the measurements were made in air with the bubbly termination at the bottom of the tube. In both cases, an SRS-785 spectrum analyzer was used to measure and calculate the transfer function. The transfer function technique (IS0 10534-2-1998) was used to determine the impedance of the bubbly liquid. Once the impedance was found, the phase speed was calculated. Results will be presented with a range of void fractions and bubble radii.
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