THE DETECTION OF TETHERED AND RISING BUBBLES USING MULTIPLE ACOUSTIC TECHNIQUES

There exists a range of acoustic techniques for characterizing bubble populations within liquids. Each technique has limitations, and comple te characterization of a population requires the sequential or simulta neous use of several, so that the limitations of each find compensatio n in the others. Here, nine techniques are deployed using one experime ntal rig, and compared to determine how accurately and rapidly they ca n characterize given bubble populations. These are, specifically (i) t wo stationary bubbles attached to a wire; and (ii) injected, rising bu bbles. (C) 1997 Acoustical Society of America.