On the collapse of water vapour cavities in a bubble analogue apparatus

Dynamics and acoustic energy dissipation in conical bubble collapse

“…These conditions are similar to those used by Hawtin et al (1970). In contrast, in the experiments performed by Leighton et al (1999a,b), the meniscus starts moving from the base of the cone or positions above this level, and no time delay is considered; see Table 1.…”

“…In pioneer studies of CBC (e.g., Leighton et al, 1997 and2000;Henwood et al, 1969 and1970) in which a driving pressure of approximately 1 bar was applied, degasified water was used as a liquid piston and high speed photography/video was acquired up to 6000 fps. In contrast, we have implemented improvements that give us methodological advantages as: we applied up to 3 bars, used a cone that has a hexagonal outer shape, the liquid piston is a viscoelastic fluid, triggered all measuring devices simultaneously, and acquired digital video at 50,000 fps (at least).…”

“…3 shows the numerical results of the liquid displacement H(t) in the conical region using the experimental run described in Table 2. Before starting the discussion of results, it is worth noting that the model of Hawtin et al (1970) is only able to simulate the motion of the meniscus through the conical region until it reaches the minimum radius and the first moments of rebound. The minimum radius of the bubble as computed with the model agrees well with experimental observations.…”

“…In the mathematical model proposed by Hawtin et al (1970), the pressure on the ''bubble wall'' is determined by vapour pressure and the compression begins in the tubular region, below the base of the cone; meanwhile, in the model proposed by Leighton et al (1998 and2000), the pressure is determined by permanent gas, and the compression begins at the base of the cone or positions above to this level. In both methods, the motion is dominated by inertia associated with the liquid.…”

“…The use of a U-tube with conical termination was pioneered by Henwood and contributors Kosky (1968), Kosky and Henwood (1969) and Hawtin et al (1970), who proposed a new technique to emulate the condensation and collapse of vapour bubble in conical cavities. Their analogue apparatus consists of a U tube with conical termination to one limb.…”